Weapons

Sergeants Distance Education Program

8017A

WEAPONS (8017) Course Introduction

Scope

The Weapons course is designed to provide the Marine sergeant with technical and detailed instruction on the characteristics and operation of some of the most common small arms found in the Marine Corps arsenal. These include the · · · · · · · ·

M9 pistol M203 grenade launcher M249 squad automatic weapon (SAW) M240G machinegun M2HB .50 caliber machinegun MK19 machinegun Traversing and elevating mechanism M136, 84MM HEAT launcher and high explosive anti-tank cartridge (AT-4)

Discussion of each weapon includes its · · · · ·

Characteristics Operation Maintenance Firing Procedures Employment

If you find that you need a detailed review of a particular weapon, you will probably want to enroll in specific weapons courses (commonly called “red books”) offered by the Marine Corps Institute. Continued on next page

MCI Course 8017

i

Course Introduction

Course Introduction, Continued References

The following references were used in the writing of this course: · · · · · · · · · · · ·

Table of Contents

TM 9-1010-221-10, Operators Manual, Grenade Launcher, 40mm, M203. TM 08671A-10/1, Operators Manual, Machinegun, 5.56, M249. TM 08670B-10/1, Operators Manual, Machinegun, 240 Machinegun Series. TM 08670B-10/1A, Supplement-1 Operators Manual. TM 9-1005-213-10, Operators Manual Machinegun, Caliber .50. Browning, M2, Heavy Barrel and Mount, Tripod, Machinegun, Caliber .50, M3. TM 08521A-10/1A, Operator’s Manual, Machinegun, 40mm, MK19 Mod 3. TM 1005A-10/1, Operators Manual, Pistol, 9mm, M9. TM 9-1010-221-10, Rifle, 5.56mm, M-16A2 W/E. TM 9-1315-886-12, Operator's and Unit Maintenance Manual for Launcher and Cartridge, 84 Millimeter: M136 (AT4). MCWP 3-15.1, Machineguns and Machinegun Gunnery. FMFM 6-5, Marine Rifle Squad. FM 3-23.25, Light Anti-Armor Weapons.

The following is a table of contents for this course. Study Unit -1 2 3 4 5 6 7 8 --

Estimated Study Time

Title Course Introduction M9 Pistol M203 Grenade Launcher M249 Squad Automatic Weapon (SAW) M240G Machinegun MOD 3 M2HB .50 Caliber Machinegun MK19 Machinegun Traversing and Elevating Mechanism M136, 84MM HEAT Launcher and High Explosive Anti-Tank Cartridge (AT-4) Review Lesson Examination

Page i 1-1 2-1 3-1 4-1 5-1 6-1 7-1 8-1 R-1

You will spend about 18 hours and 20 minutes completing this course. This includes the time you will need to study the text, complete the exercises, and take the final exam. Continued on next page

MCI Course 8017

ii

Course Introduction

Course Introduction, Continued

Reserve Retirement Credits

You earn 6 retirement credits for completing this course. You earn reserve retirement credits at the rate of one credit for each 3 hours of estimated study time. Note: Reserve retirement credits are not awarded for the MCI study you do during drill periods if awarded credits for drill attendance.

Summary

The table below summarizes all the important “gateways” needed to successfully complete this course. Step

When you

1

Enroll in the program

2

Complete the selfpaced text Pass the final examination

3

References

Then you will Receive your program material Arrange to take the final examination Receive a course completion certificate

For more information Refer to the Program Introduction Refer to the Program Introduction Refer to the Program Introduction

The following table lists publications that can be used as additional sources of information about the content of this course. Publication Number Title TM 9-1010-221-10 Operator’s Manual, Grenade Launcher, 40mm, M203 TM 08671A-10/1A Operator’s Manual, Machinegun, 5.56mm, M249 TM 08670B-10/1 Operator’s Manual, Machinegun, 240 Machinegun Series TM 08670B-10/1A Supplement-1 Operator’s Manual TM 9-1005-213-10 Operator’s Manual Machinegun, Caliber .50, Browning, M2, Heavy Barrel and Mount, Tripod, Machinegun, Caliber .50, M3 TM 08521A-10/1A Operator’s Manual, Machinegun, 40mm, MK19 Mod3 MCWP 3-15.1 Machineguns and Machinegun Gunnery FMFM 6-5 Marine Rifle Squad

MCI Course 8017

iii

Course Introduction

(This page intentionally left blank.)

MCI Course 8017

iv

Course Introduction

STUDY UNIT 1 M9 PISTOL Overview

Estimated Study Time

1 hour, 35 minutes

Unit Scope

This study unit teaches you the characteristics, operation, maintenance, immediate action, care and cleaning techniques, and firing procedures for the M9 pistol.

Learning Objectives

After completing this unit, you should be able to

Unit Content

·

Identify the characteristics of the M9 pistol.

·

Identify the procedures for maintaining the M9 pistol.

·

Identify the techniques for using the M9 pistol.

The following table lists the lessons covered in this study unit. Lesson 1 Lesson 2 Lesson 3

MCI Course 8017A

Topic Description of the M9 Pistol Clearing, Disassembling, and Cleaning the M9 Pistol Assembling, Stoppages, and Immediate Action for the M9 Pistol

1-1

See Page 1-3 1-11 1-25

Study Unit 1

(This page intentionally left blank.)

MCI Course 8017A

1-2

Study Unit 1

LESSON 1 DESCRIPTION OF THE M9 PISTOL Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson teaches you the basic characteristics of the M9 pistol and the ammunition it uses.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the role of the M9 pistol.

·

Identify the principal characteristics of the M9 pistol.

·

Identify the steps in the cycle of operation of the M9 pistol.

·

Identify the standard type of ammunition for the M9 pistol.

This lesson contains the following topics: Topic Introduction General Characteristics of the M9 Pistol Cycle of Operation of the M9 Pistol Ammunition for the M9 Pistol Lesson 1 Exercise

MCI Course 8017A

1-3

See Page 1-3 1-4 1-7 1-8 1-9

Study Unit 1, Lesson 1

General Characteristics of the M9 Pistol

Role

The M9 pistol provides timely and accurate fire in a close combat situation and as a means of defense for personnel assigned · ·

Major Components

The M9 pistol as their primary weapon To crew served weapons

The diagram below identifies the major components of the M9 pistol.

Continued on next page

MCI Course 8017A

1-4

Study Unit 1, Lesson 1

General Characteristics of the M9 Pistol, Continued Description

The diagram below shows the major parts for the M9 pistol. Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Weight

Part Firing Pin Block Extractor/Loaded Chamber Indicator Trigger Front Sight Slide Assembly Disassembly Lever Slide Stop Rear Sight Decocking/Safety Lever Hammer Receiver Grip Lanyard Loop Magazine Magazine Catch Assembly Disassembly Button

The following table lists the approximate weight (in ounces) of the M9 pistol. Item M9 pistol (with 15-round magazine) M9 pistol (with empty magazine)

Weight (lbs) 2.54 2.12 Continued on next page

MCI Course 8017A

1-5

Study Unit 1, Lesson 1

General Characteristics of the M9 Pistol, Continued

Length

The following table lists the length (in inches) of the M9 pistol. Item Barrel length Length of gun, overall

Range

Length (in inches) 4.92 8.54

The following table lists the range (in meters) for the M9 pistol. Type of Range Maximum Effective Maximum Range

Range (in meters) 50 1800

Muzzle Velocity The muzzle velocity of the M9 pistol is 1230.3 feet per second.

Safety Mechanisms

MCI Course 8017A

The M9 pistol is equipped with two safety mechanisms described below: ·

The manual decocking/safety lever, located on the slide, which separates the firing pin from the hammer, lowers the hammer when cocked, and interrupts the connection between trigger and sear.

·

The firing pin block prevents any motion of the firing pin and is overcome only by pulling on the trigger.

1-6

Study Unit 1, Lesson 1

Cycle of Operation of the M9 Pistol

Operation

MCI Course 8017A

The cycle of operation for the M9 pistol consists of the following eight steps: Step 1

Action Feeding

2

Chambering

3

Locking

4

Firing

5

Unlocking

6

Extracting

7

Ejecting

8

Cocking

1-7

Description The recoil spring moves the slide forward feeding the next cartridge from the magazine into the chamber. The slide continues forward and the case head slides up the breech face and under the extractor. The round is now chambered with the extractor positioned in the groove of the cartridge case. The locking block is cammed upward forming one mechanical unit. Forward motion ceases as the disassembly latch bolt stops the locking block. Pressure developed by combustion gases recoils the slide and barrel assembly to the rear. Recoiling a short distance, the locking block plunger forces the locking lugs on the locking block to swing down out of the recesses in the slide. The slide extracts and ejects the cartridge case. The extractor carries the case to the rear and the head of the case strikes the fixed ejector which pivots the case and ejects it from the pistol. As the slide ejects the cartridge, the hammer is cocked.

Study Unit 1, Lesson 1

Ammunition for the M9 Pistol

Standard Ammunition

The standard ammunition for the M9 pistol is the NATO M882 9mm ball round, as shown below.

Caution: · · ·

MCI Course 8017A

Do not fire

Heavily corroded or dented cartridges Cartridges with loose bullets Other defective rounds as detected by visual inspection

1-8

Study Unit 1, Lesson 1

Lesson 1 Exercise

Estimated Study Time

5 minutes

Directions

Complete exercise items 1 through 4 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

The M9 pistol provides a. b. c. d.

Item 2

What is the weight (in pounds) of the M9 service pistol with 15 round magazine? a. b. c. d.

Item 3

2.00 2.50 2.54 3.00

What is the fourth step in the cycle of operation of the M9 pistol? a. b. c. d.

Item 4

rapid, accurate fire in long-range situations. rapid, accurate fire in close combat. timely, accurate fire in long-range situations. timely, accurate fire in close combat.

Locking Firing Unlocking Extracting

What is the standard ammunition used for the M9 pistol? a. b. c. d.

Any 9mm cartridge 9mm armor piercing NATO round 9mm, ball, NATO M882 9mm tracer NATO round Continued on next page

MCI Course 8017A

1-9

Study Unit 1, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4

MCI Course 8017A

Answer d c b c

1-10

Reference Page 1-4 1-5 1-7 1-8

Study Unit 1, Lesson 1 Exercise

LESSON 2 CLEARING, DISASSEMBLING, AND CLEANING THE M9 PISTOL Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson teaches you how to clear, disassemble, and clean the M9 pistol.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the steps to clear the M9 pistol.

·

Identify the steps to disassemble the M9 pistol.

·

Identify the cleaner/lubricant used on the M9 pistol.

·

Identify the steps for the care and cleaning of the M9 pistol.

This lesson contains the following topics. Topic Introduction Clearing the M9 Pistol Disassembling the M9 Pistol Cleaning the M9 Pistol Lesson 2 Exercise

MCI Course 8017A

1-11

See Page 1-11 1-12 1-13 1-19 1-22

Study Unit 1, Lesson 2

Clearing the M9 Pistol Procedures

Before you begin to disassemble the M9 pistol, you must clear it to be sure it is completely safe. The five steps to clear the M9 pistol are listed in the table below. Step 1

2

Remove the magazine by pressing the magazine release button in. Catch the magazine as it falls from the pistol.

3

Pull the slide to the rear with your left hand and lock it in place by pushing up on the slide stop with your right thumb.

4

Inspect the chamber by tilting the weapon up so you can see into the chamber and be sure no rounds are present. Release the slide and allow it to return to the forward position.

5

MCI Course 8017A

Action Place the weapon on safe by rotating the ambidextrous thumb safety to the down position.

1-12

Study Unit 1, Lesson 2

Disassembling the M9 Pistol

Operator Disassembly

After you clear the M9 pistol, you may begin disassembly into main groups for cleaning and inspection. The four main groups are the · · · · ·

Component

Parts

Slide group Recoil spring and guide group Barrel group Magazine group Receiver group

The diagram below shows the components of the M9 pistol.

Continued on next page

MCI Course 8017A

1-13

Study Unit 1, Lesson 2

Disassembling the M9 Pistol, Continued

Slide Groups From the Receiver

The following table lists the steps for removing the slide, barrel, and recoil spring and guide groups from the receiver. Step 1

Action Depress the disassembly button (as shown in picture below) located on the right hand side of the receiver just above the front strap of the trigger guard. Extend your forefinger along the receiver until you can depress the button. Once you have depressed the button, hold it in that position.

2

Rotate the disassembly lever. Now, with the thumb of the left hand, rotate the disassembly lever clockwise and down (as shown in picture below). The lever will rotate 90 degrees to a solid stop. Now you can relax the pressure on the disassembly button.

Continued on next page

MCI Course 8017A

1-14

Study Unit 1, Lesson 2

Disassembling the M9 Pistol, Continued

Slide Groups, continued

Step 3

Action Once the disassembly lever comes to a stop, you will hear a click and the slide will jump forward slightly. The slide is now unlocked from the receiver. With your left hand, grasp the slide and pull it (along with the barrel, recoil spring, and guide) forward off the receiver as shown in the picture below. Now set the receiver aside since nothing more can be removed from it.

Continued on next page

MCI Course 8017A

1-15

Study Unit 1, Lesson 2

Disassembling the M9 Pistol, Continued

Recoil Spring and Guide

MCI Course 8017A

The following table lists the steps to remove the recoil spring and guide from the slide. Step 1

Action Cradle the slide upside down in your left hand and compress the recoil spring with your right thumb (as shown in the picture below).

2

Once the spring is compressed, lift up on the rear of the guide (as shown in picture below) and pull the spring and guide from the slide.

3

Now you can separate the spring from the guide.

1-16

Study Unit 1, Lesson 2

Disassembling the M9 Pistol Magazine

Magazine Group

MCI Course 8017A

The following table lists the steps to disassemble the M9 pistol magazine. Step 1

Action Grasp the magazine with the back of the magazine tube against the palm of the hand.

2

Use a 9mm round to depress the locking block plunger protruding from the floorplate and slide floorplate away from you.

3

Maintain pressure on the magazine spring with the thumb remove the floorplate, spring, and follower from magazine tube.

1-17

Study Unit 1, Lesson 2

Cleaning the M9 Pistol

Cleaners and Lubricants

To be sure that your M9 pistol works correctly, keep it clean and properly lubricated. Note: Your cleaning equipment can be either a regular rifle cleaning brush (toothbrush) or a bore brush and cleaning rod. The following table lists authorized cleaners/lubricants and their use on the M9 pistol. Cleaners/Lubricants Cleaner, Lubricant, Preservative (CLP)

Lubricant, Arctic Weather (LAW) Caution:

Purpose of Cleaning

Use Cleans, lubricates, and preserves at temperatures down to –35°F Note: CLP is the most commonly used cleaning/lubricant for cleaning the M9 pistol. Lubricates at extremely cold temperatures (below 0°F)

Do not use any dry cleaning solvent that contains acid to clean grease, oil, or corrosion-preventive compounds from the M9 pistol.

You must clean the M9 pistol after you have fired it because firing produces deposits of primer fouling, powder ashes, carbon, and metal fouling. These deposits collect and promote rust if you do not remove them. The cleaning procedures described on the next page enable you to remove all deposits except metal fouling. Note: Only the unit armorer is authorized to remove metal fouling. Caution:

Report all burred, worn, cracked defective parts to your unit armorer for correction. Continued on next page

MCI Course 8017A

1-18

Study Unit 1, Lesson 2

Cleaning the M9 Pistol, Continued

Cleaning the Bore

The following table lists the steps to clean the bore of the M9 pistol. Step 1

2 3 4 5

Cleaning the Slide Assembly

Action Attach the bore brush to the cleaning rod. Insert the brush in the bore and move it back and forth in the bore to loosen carbon deposits. Repeat this step until a dry cleaning patch pulled through the bore exits clean. Attach a clean, dry cleaning patch to the cleaning rod. Moisten the cleaning patch thoroughly with CLP. Pull the patch through the bore several times and inspect the patch. Repeat this step until the patch shows no fouling. Inspect bore for pitting or obstruction, blocking block moves freely and there are no cracks or burrs visible.

The following table lists the steps to clean the bore of the M9 pistol. Step 1

2 3

Action Moisten a soft brush with CLP and remove excess dirt and carbon buildup around the decocking lever, breech face, extractor, and slide guides.

Wipe dry with a cloth and apply a light coat of CLP. Inspect the slide assembly for free movement of safety lever and firing pin block. Check the rear sight for looseness or cracks. Continued on next page

MCI Course 8017A

1-19

Study Unit 1, Lesson 2

Cleaning the M9 Pistol, Continued

Cleaning the Receiver Assembly

The following table lists the steps to clean the receiver of the M9 pistol.

Step 1

2 3

Extreme Environments

Action Wipe the receiver assembly clean with cloth or soft brush paying attention to the disassembly lever, trigger, slide stop, hammer, and magazine release button.

Apply a light coat of CLP. Inspect the receiver assembly for checks or chips. The free movement of slide stop and magazine catch assembly. Look for excessive wear and burrs on the guide rails.

Take extra precautions to be sure the M9 pistol operates trouble free in extreme environments. Refer to the table below for precautions to take in different environments. Type of Climate Hot Humid Hot, dry, sandy Below freezing

MCI Course 8017A

Care/Cleaning Inspect/clean daily Inspect daily Clean and lubricate daily Remove excess oil Keep weapon free of moisture Keep the M9 temperature close to the outside temperature

1-20

Prevents Moisture and rust Moisture and rust Rust and corrosion Sluggish operation Rust and corrosion Moisture and rust

Study Unit 1, Lesson 2

Lesson 2 Exercise

Estimated Study Time

10 minutes

Directions

Complete exercise items 1 through 8 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

To clear the M9 pistol, place the weapon on safe, __________________, lock the slide to the rear, inspect the chamber, and release the slide to return to forward position. a. b. c. d.

Item 2

After you have cleared the M9 pistol, what is the first step to disassemble the pistol? a. b. c. d.

Item 3

remove the handguard inspect the breech remove the magazine remove the ammunition from the chamber

Slide the assembly off the receiver track. Depress the disassembly button. Inspect the chamber. Place weapon on safe.

What is the most commonly authorized cleaner/lubricant used on the M9 pistol? a. b. c. d.

CLP LSA LAW RBC Continued on next page

MCI Course 8017A

1-21

Study Unit 1, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Items 4 Through 7

Item 8

Matching: In the space provided, place the letter of the steps to clean the M9 pistol from column 2 in the correct sequence for cleaning the M9 pistol bore in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Correct Sequence

Steps to Clean the M9 pistol Bore

___ 4. ___ 5. ___ 6. ___ 7.

a. Moisten the cleaning patch thoroughly with CLP. b. Attach the bore brush to the cleaning rod. Insert the brush in the bore and move it back and forth in the bore to loosen carbon deposits. c. Attach a clean, dry cleaning patch to the cleaning rod. d. Pull the cleaning patch through the bore several times until it shows no fouling.

To prevent rust and corrosion in a hot, dry, sandy climate, you should a. Remove excess oil and keep the M9 pistol temperature close to the outside temperature. b. Clean and lubricate daily. c. Keep weapon free of moisture and remove excess oil. d. Remove excess oil and keep muzzle and receiver covered. Continued on next page

MCI Course 8017A

1-22

Study Unit 1, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8

MCI Course 8017A

Answer c b a b c a d b

1-23

Reference Page 1-12 1-14 1-18 1-19 1-19 1-19 1-19 1-20

Study Unit 1, Lesson 2 Exercise

(This page intentionally left blank.)

MCI Course 8017A

1-24

Study Unit 1, Lesson 2 Exercise

LESSON 3 ASSEMBLING, STOPPAGES, AND IMMEDIATE ACTION FOR THE M9 PISTOL Introduction Estimated Study Time

25 minutes

Lesson Scope

This lesson teaches you how to assemble, identify stoppages and their causes, and perform immediate action on the M9 pistol.

Learning Objectives

After completing this lesson you should be able to

In This Lesson

·

Identify the steps to assemble the M9 pistol.

·

Identify the steps to perform a function check on M9 pistol.

·

Identify the steps to load the M9 pistol.

·

Identify the method to engage targets with the M9 pistol.

·

Identify stoppages and their causes on the M9 pistol.

·

Identify the steps for immediate action on the M9 pistol.

This lesson contains the following topics. Topic Introduction Assembling the M9 Pistol Performing a Function Check on M9 Pistol Loading the M9 Pistol Engaging Targets with the M9 Pistol Stoppages of the M9 Pistol Immediate Action for the M9 Pistol Lesson 3 Exercise

MCI Course 8017A

1-25

See Page 1-25 1-26 1-30 1-31 1-33 1-36 1-37 1-38

Study Unit 1, Lesson 3

Assembling the M9 Pistol

Procedure

After you have cleaned your M9 pistol, you are ready to assemble your weapon. To assemble the M9 pistol, replace the parts in the reverse order of disassembly. · · · ·

Installing the Barrel into the Slide

Install the barrel into the slide. Install the recoil spring and guide into the slide. Install the slide, barrel, and recoil spring and guide onto the receiver. Assemble magazine for M9 pistol.

The following table lists the steps to install the barrel into the slide.

Step 1

2 3 4

Action Cradle the barrel upside down in your left hand. Push forward until the muzzle barely protrudes from the slide.

Grasp the locking block lightly between the thumb and forefinger of your right hand. Insert the barrel, muzzle first, into the slide. Make sure the locking lugs engage the locking lug shoulders of the bolt. Push the barrel slightly rearward to lock it into position. Continued on next page

MCI Course 8017A

1-26

Study Unit 1, Lesson 3

Assembling the M9 Pistol, Continued

Installing the Recoil Spring and Guide into the Slide

The following table lists the steps to install the recoil spring and guide into the slide.

Step Action 1 Fully insert the recoil spring on the spring guide.

2

Insert the free end of the spring into the spring recess in the front of the slide.

3

Compress the spring slightly; rotate the guide, head down, until it rests in the guide groove. Make sure the guide fits snugly in the groove.

Continued on next page

MCI Course 8017A

1-27

Study Unit 1, Lesson 3

Assembling the M9 Pistol, Continued

Installing the Slide, Barrel, and Recoil Spring and Guide onto the Receiver

The following table lists the steps to install the slide, barrel, and recoil spring and guide onto the receiver.

Step 1 2

3 4 5

6

Action Pick up the receiver. If the hammer is cocked, gently lower it until it meets the receiver frame. Grasp the front section of the slide with your left hand, placing your thumb on the recoil spring and guide so the spring and guide do not become misaligned with the locking block.

Carefully guide the rear portion of the slide rails onto the front portion of the receiver rails. When the rails are well engaged, push the slide all the way against the hammer, pushing the hammer slightly rearward. Rotate the wing of the disassembly lever counterclockwise to its closed position. As soon as you rotate the lever, the recoil spring guide (under pressure from the spring) should force the disassembly lever up with a loud click.

To verify correct assembly, pull the slide back and release it. It should close energetically. Continued on next page

MCI Course 8017A

1-28

Study Unit 1, Lesson 3

Assembling the M9 Pistol, Continued

Assemble Magazine

The following table lists the steps to assemble the 15 round magazines used with the M9 pistol. Step 1

Action Insert the follower into the top coil of the magazine spring.

Notes: The top coil has an upward and forward pointing end.

2 3

MCI Course 8017A

Ensure that the notches on follower and magazine tube are on the same side. Insert the spring into the magazine tube. Attach the floorplate retainer to the bottom coil of the spring. Slide the floorplate over the retainer, locking it in place.

1-29

Study Unit 1, Lesson 3

Performing a Function Check on the M9 Pistol

Purpose

After you have assembled your M9 pistol, perform a function check to ensure the M9 pistol is performing properly.

Procedure

The table below list the steps to perform a function check on the M9 pistol. Step 1 2 3 4 5 6 7

MCI Course 8017A

Action Insert an empty magazine into the pistol and ensure that the magazine catch locks the magazine in place. Retract the slide to the rear, ensuring the magazine's slide stop locks slide assembly to the rear. Ensure the safety lever is in the safe position (down). Depress the slide stop and allow the slide to return forward. Observe that the hammer is in the forward position. Squeeze and release trigger. Observe that firing pin block moves up and down. The hammer should not move. Place the safety lever in fire position (up). Squeeze the trigger. The hammer should cock and fall (double action). Squeeze the trigger again and hold it to the rear. Move the slide to the rear and release. Release the trigger. You should hear a click and the hammer should not fall.

1-30

Study Unit 1, Lesson 3

Loading the M9 Pistol

Procedures

The M9 pistol can fire any time the trigger is pulled with the safety lever in the fire position and a round in the chamber. The following table lists the steps to load the M9 pistol. Step 1

Action Insert a loaded magazine into the magazine well of the pistol until a click of the magazine catch is heard.

2

Pointing the pistol in a safe direction, grasp the serrated portion of the slide and retract the slide to the rear. Release the slide, allowing a round from the magazine to be chambered.

3

Continued on next page

MCI Course 8017A

1-31

Study Unit 1, Lesson 3

Loading the M9 Pistol, Continued

Load M9 magazine

The following table lists the steps to load a 15-round magazine used by the M9 pistol. Step 1

2 3

MCI Course 8017A

Action Place a cartridge on the magazine follower in front of the lips.

Press down and slide the cartridge completely back under the lips. Repeat these steps until the magazine is fully loaded.

1-32

Study Unit 1, Lesson 3

Engaging Targets with the M9 Pistol

Introduction

The weapon must become an extension of the hand and arm. To accurately engage targets with the M9 pistol, you must be familiar with griping, aiming and firing position of the M9 pistol.

Grip the M9 Pistol

A proper grip is one of the most important fundamentals in firing the M9 pistol. The two-hand grip used to fire the M9 pistol allows the firer to steady the firing hand and provide maximum support during firing. Position your hand as stated in the below table. Hand Non-firing Firing Firing Firing

Non-firing Non-firing

Fingers Hold the weapon. Form a V with the thumb and forefinger and place the weapon in the V with the front and rear sights in line with the firing arm. Wrap the lower three fingers around the pistol grip, putting equal pressure with all three fingers to the rear. Allow the thumb to rest alongside the weapon without pressure and grip the weapon.

Note: The hand should not tremble. Wrap the fingers around the firing hand, ensuring that the index finger is between the middle finger of the firing hand and trigger guard. Rest the thumb alongside the firing thumb WARNING:

If the thumb is placed in the rear of the weapon the recoil could result in personal injury. Continued on next page

MCI Course 8017A

1-33

Study Unit 1, Lesson 3

Engaging Targets with the M9 Pistol, Continued

Aiming

Aiming is the proper sight alignment and sight placement of the M9 pistol on the target.

Sight Alignment

The front blade sight of the M9 pistol is centered and leveled with the top of the rear sight notch. Note: See picture below.

Sight Placement

The position of the weapon’s sights on the target as seen by the firer. Proper sight placement is the correct sight alignment with the front sight post center mass on the target. Note: See picture below.

Proper Sight Alignment and Sight Placement

The picture below shows the proper alignment and placement of the M9 sight on a target.

Continued on next page

MCI Course 8017A

1-34

Study Unit 1, Lesson 3

Engaging Targets with the M9 Pistol, Continued

Firing Position for M9 Pistol

The standing firing position is used to engage targets with the M9 pistol. To ensure quick response to dangerously close targets, it must be practiced so it becomes natural. The standing position is illustrated and described in the table below.

· · ·

MCI Course 8017A

Body / Feet Face the target Feet shoulder width apart

· ·

Arms Extend the firing arm Wrist and elbow of the firing arm are locked and pointed toward target center.

Body straight with the shoulders slightly forward of the buttocks

1-35

Study Unit 1, Lesson 3

Stoppages of the M9 Pistol

Definition

A stoppage is the unintentional interruption in the function or failure to fire of the M9 pistol.

Failure to Fire

Failure of the M9 pistol to fire can be can be a result of the following:

Unintentional Interruptions

·

Hangfire. A delay in the functioning of a propelling charge explosive train at the time of firing.

·

Misfire. A complete failure to fire. A misfire itself is not dangerous but since it cannot be immediately distinguished from a hangfire you must consider it a hangfire until proven otherwise.

The table below lists common interruptions that may be experienced with the M9. Stoppage Stovepipe

Cause Occurs when the weapon fails to completely eject the casing. Occurs when two rounds are stuck in the receiver. Caused by a number of reasons, as simple as dirty ammunition or a dirty pistol. Occurs when only a portion of the propellant is ignited.

Double feed Slide not fully seated Audible pop or reduced recoil

MCI Course 8017A

1-36

Study Unit 1, Lesson 3

Immediate Action for the M9 Pistol

Definition

Immediate action is the prompt action taken by the user to correct a stoppage, without attempting to discover the cause.

Procedure

Since it’s important that immediate action become instinctive, the following table lists the steps to perform immediate action on the M9 pistol. Step 1 2 3

Action TAP – Slap the bottom of the magazine upward to ensure it is fully seated. RACK – Pull the slide all the way to the rear and release it to ensure a round is chambered. BANG – Sight and attempt to fire. If immediate action was successful, the pistol will fire. Note: If the M9 pistol fails to fire in a non-tactical situation, clear the pistol and determine cause of the stoppage.

MCI Course 8017A

1-37

Study Unit 1, Lesson 3

Lesson 3 Exercise

Estimated Study Time

5 minutes

Directions

Complete exercise items 1 through 6 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

What is the first step in assembling the M9 pistol? a. b. c. d.

Item 2

What step checks that the M9 pistol’s hammer cocks and falls (double action) when performing a function check? a. b. c. d.

Item 3

Install the barrel into the slide. The first step is identical to disassembly. Install the recoil spring. Grasp the locking lugs.

Two Five Six Seven

When loading the M9 pistol, ensure the pistol is pointing a. b. c. d.

in a safe direction. at the target. at six o’clock. at 45 degrees. Continued on next page

MCI Course 8017A

1-38

Study Unit 1, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Item 4

The M9 pistol is held with the ___________when engaging a target. a. b. c. d.

Item 5

A stoppage is defined as a. b. c. d.

Item 6

firing hand non-firing hand firm grip thumb and forefinger

improperly loaded ammunition into the weapon. any unintentional interruption in the functioning of the weapon. waiting for 40 seconds and clearing the weapon. having an ammunition casing stuck in the breech.

What are the three steps for immediate action? a. b. c. d.

TAP, RACK, PULL HIT, PULL, TAP PULL, RACK, BANG TAP, RACK, BANG Continued on next page

MCI Course 8017A

1-39

Study Unit 1, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6

MCI Course 8017A

Answer a c a b b d

1-40

Reference Page 1-26 1-30 1-31 1-33 1-36 1-37

Study Unit 1, Lesson 3 Exercise

STUDY UNIT 2 M203 GRENADE LAUNCHER Overview

Estimated Study Time

2 hours, 15 minutes

Unit Scope

This study unit teaches you the characteristics, operation, maintenance, immediate action, care and cleaning techniques, and firing procedures for the M203 grenade launcher.

Learning Objectives

After completing this unit, you should be able to

In This Study Unit

·

Identify the capabilities of the M203 grenade launcher.

·

Identify the procedures for maintaining the M203 grenade launcher.

·

Identify the methods for firing the M203 grenade launcher.

·

Identify stoppages and their causes.

·

Identify criteria for employing the M203 grenade launcher.

This study unit contains the following lessons: Topic Lesson 1 Description Lesson 2 Clearing, Disassembling, and Cleaning Lesson 3 Assembling, Conducting the Function Check and Firing Lesson 4 Stoppages, Immediate Action, and Employment

MCI Course 8017A

2-1

See Page 2-3 2-13 2-23 2-39

Study Unit 2

(This page intentionally left blank.)

MCI Course 8017A

2-2

Study Unit 2

LESSON 1 DESCRIPTION Introduction

Estimated Study Time

25 minutes

Lesson Scope

The objective of this lesson is to teach you the basic characteristics of the M203 grenade launcher and the ammunition it uses.

Learning Objectives

After completing this lesson, you should be able to · Identify the capabilities of the M203 grenade launcher.

In This Lesson

·

Describe the principal characteristics of the M203 grenade launcher.

·

Identify the standard types of ammunition for the M203 grenade launcher based on color and use.

This lesson contains the following topics: Topic Introduction Role and Capabilities General Characteristics Ammunition Lesson 1 Exercise

MCI Course 8017A

2-3

See Page 2-3 2-4 2-5 2-7 2-10

Study Unit 2, Lesson 1

Role and Capabilities

Role

The M203 grenade launcher supports the fire team in both the offense and the defense by providing close fire support over the entire team sector of fire.

Capabilities

The four capabilities of the M203 are to · · · ·

MCI Course 8017A

Destroy groups of enemy personnel Fire on enemy troops and automatic weapons that are in defilade Provide close fire support in the assault Supplement other supporting fires

2-4

Study Unit 2, Lesson 1

General Characteristics

Components

The diagram below shows the M203 grenade launcher and its major components attached to the M16A2 service rifle.

Weight

The following table lists the approximate weight (in pounds) of the M203 grenade launcher and the M16A2 rifle. Item M203 Grenade Launcher M16A2 Rifle

Range

Weight (in pounds) 3 6.5

The following table lists the range (in meters) for the M203 grenade launcher. Type of Range Maximum Maximum Effective Minimum Safe

Range (in meters) 400 Area Target: 350 Point Target: 150 Training: 165 Combat: 31 Continued on next page

MCI Course 8017A

2-5

Study Unit 2, Lesson 1

General Characteristics, Continued

Description

The eight characteristics of the M203 grenade launcher are listed below. · · · · · · ·

MCI Course 8017A

Lightweight Single-shot Breech loaded Pump action (sliding barrel) Shoulder-fired Attaches to the M16A2 rifle Fires a 40mm grenade

2-6

Study Unit 2, Lesson 1

Ammunition

Ammunition Types

The 40mm grenade cartridge used in the M203 is a fixed-type ammunition, consisting of two major assemblies, the cartridge case and the projectile. The standard types of ammunition used with the M203 grenade launcher are described in the following table by color and use. Type

Color

High explosive (HE)

Used to

Danger Radius 130 meters

Engage enemy · Automatic weapon positions · Personnel dug into fighting positions

High explosive airburst (HE airburst)

Engage enemy

High explosive dual purpose (HEDP)

Engage enemy

27 meters

· Personnel on the move · Troops in the open

130 meters

· Automatic weapon positions · Crew-served weapon positions

Continued on next page

MCI Course 8017A

2-7

Study Unit 2, Lesson 1

Ammunition, Continued

Ammunition Types, continued

Type

Color

Used to

CS gas

Provide chemical effects (including temporary nausea, tearing of eyes, and intense coughing) against enemy troops

Multipurpose (Buckshot)

Engage enemy personnel in the open.

Danger Radius N/A

N/A

When firing, aim at the foot of the target. Train grenadiers

Training practice (TP)

20 meters Note: Fuze arms between 14 to 27 meters.

Continued on next page

MCI Course 8017A

2-8

Study Unit 2, Lesson 1

Ammunition, Continued

Ammunition Types, continued

Type

Color

Training practice (TP)

Used to

Danger Radius

Train grenadiers Completely inert and contains no fuze.

Illuminating

Light up area N/A

Mark ground

Signaling

N/A

Signaling

Mark ground N/A

MCI Course 8017A

2-9

Study Unit 2, Lesson 1

Lesson 1 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 3 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

What is one capability of the M203 grenade launcher? a. b. c. d.

Item 2

The maximum range of the M203 grenade launcher is ______ meters. a. b. c. d.

Item 3

Support and deliver enemy fires Destroy soft-skinned vehicles Supplement other supporting fires Provide enemy fire support

150 350 400 460

The standard types of ammunition used with the M203 are high explosive, high explosive airburst, high explosive dual purpose, CS gas, and a. b. c. d.

variable time. white phosphorous. training practice. variable inert. Continued on next page

MCI Course 8017A

2-10

Study Unit 2, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer c c c

2-11

Reference Page 2-4 2-5 2-8

Study Unit 2, Lesson 1 Exercise

(This page intentionally left blank.)

MCI Course 8017A

2-12

Study Unit 2, Lesson 1 Exercise

LESSON 2 CLEARING, DISASSEMBLING, AND CLEANING Introduction

Estimated Study Time

25 minutes

Lesson Scope

The objective of this lesson is to teach you how to clear, disassemble, and clean the M203 grenade launcher.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the steps to clear the M203 grenade launcher.

·

Identify the steps to disassemble the M203 grenade launcher.

·

Identify the cleaners/lubricant used for the M203 grenade launcher.

·

Identify steps for the care and cleaning of the M203 grenade.

This lesson contains the following topics: Topic Introduction Clearing Disassembling Cleaning Lesson 2 Exercise

MCI Course 8017A

2-13

See Page 2-13 2-14 2-15 2-17 2-20

Study Unit 2, Lesson 2

Clearing

Steps

Before you begin to disassemble the M203 grenade launcher, you must clear the weapon to be sure it is completely safe. The following table lists the steps to clear the M203 grenade launcher. Step 1

MCI Course 8017A

Action Place the weapon on safe by lowering the safety located inside the trigger guard.

2

Depress the barrel latch

3

Slide the barrel assembly forward.

4

Inspect the breech.

2-14

Study Unit 2, Lesson 2

Disassembling

Procedure

The table below lists the steps to disassemble the M203 grenade launcher. Step 1

2

Action Remove the quadrant sight by loosening the knurled screw on the right side of weapon.

Remove the handguard and sight assembly by · ·

Pushing down on the slip ring of the rifle. Lifting up on hand guard and pulling it to the rear.

Continued on next page

MCI Course 8017A

2-15

Study Unit 2, Lesson 2

Disassembling, Continued

Procedure, continued

Step 3

MCI Course 8017A

Action Depress the barrel latch and slide the barrel assembly forward.

4

Insert one end of a cleaning rod section into the hole and depress the barrel stop.

5

Slide barrel assembly off the receiver track.

2-16

Study Unit 2, Lesson 2

Cleaning

Purpose for Cleaning

You must clean the M203 grenade launcher after you have fired to remove powder ash and carbon fouling. These deposits will collect and promote rust. Note: Only the unit armorer is authorized to remove metal fouling. Report all burred, worn, cracked, or defective parts to your unit armorer

Cleaners and Lubricants

To be sure that your M203 grenade launcher works correctly, keep it clean and properly lubricated. Note: Your cleaning equipment can be either a regular rifle cleaning brush (toothbrush) or a bore brush and thong.

Cleaner Lubricant Preservative (CLP) is the only authorized cleaner/lubricant used for the M203 grenade launcher. CAUTION:

Do not use dry cleaning solvent that contains acid when you clean grease, oil, or corrosion-preventive compounds from the M203 grenade launcher. Continued on next page

MCI Course 8017A

2-17

Study Unit 2, Lesson 2

Cleaning, Continued

Cleaning the Bore

The following table lists the steps to clean the bore of the M203 grenade launcher assembly. Step 1 2 3 4

Action Attach a clean, dry rag (the size of a handkerchief) to the thong. Moisten the rag thoroughly with CLP. Pull the rag through the bore several times; inspect the rag. Repeat this step until the rag shows no fouling. Attach the bore brush to the thong and pull it through the bore several times as shown in the picture below. Repeat this step until a dry rag pulled through the bore exits clean.

Continued on next page

MCI Course 8017A

2-18

Study Unit 2, Lesson 2

Cleaning, Continued Procedure

The following table lists the steps to clean the chamber of the M203 grenade launcher. Step 1

2

Extreme Environments

Action Clean area around the breech insert and firing pin hole.

Wipe the locator slot with a clean rag

Take extra precautions to make sure the M203 grenade launcher operates trouble free in extreme environments. Refer to the table below for actions to take in different environments. Type of Climate Hot Humid Hot, dry, sandy

Below freezing

Salt water atmosphere

MCI Course 8017A

Care/Cleaning Inspect daily/lubricate Dry, clean and lubricate as necessary · Clean lubricate daily and wipe dry · Keep muzzle and receiver covered · Remove excess oil · Keep weapon free of moisture · Keep the M203 temperature close to the outside temperature Inspect daily/lubricate

2-19

Prevents Moisture and rust Moisture and rust · Rust and corrosion · Sand and dust in the bore · Sluggish operation · Rust and corrosion · Moisture and rust

Moisture and rust

Study Unit 2, Lesson 2

Lesson 2 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 8 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

What is the fourth step to clear the M203 grenade launcher? 1. Place the weapon on safe. 2. Depress the barrel latch. 3. Slide the barrel assembly forward. 4. a. b. c. d.

Item 2

What is the first step the gunner must perform when disassembling the M203? a. b. c. d.

Item 3

Remove the handguard. Inspect the breech. Depress the barrel stop. Remove the quadrant sight.

Slide the assembly off the receiver track. Depress the barrel latch and slide the barrel assembly forward. Remove the quadrant sight from carrying handle. Remove the handguard assembly.

Which is the only authorized cleaner/lubricant used on the M203 grenade launcher? a. b. c. d.

CLP LSA LAW RBC Continued on next page

MCI Course 8017A

2-20

Study Unit 2, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Items 4 Through 7

Item 8

Matching: In the sequence and the space provided, place the letter of the steps to clean the M203 grenade launcher assembly from column 2 to column 1. The answers in column 2 may be used only once. Column 1

Column 2

Correct Sequence

Steps to Clean

___ 4. ___ 5. ___ 6. ___ 7.

a. Moisten the rag thoroughly with CLP. b. Attach the bore brush to the thong and pull it through the bore several times. c. Pull the rag through the bore several times until it shows no fouling. d. Attach a clean, dry rag to the thong.

How do you prevent rust, corrosion, sand, and dust in the bore in a hot, dry, and sandy climate? a. Remove excess oil and keep the M203 temperature close to the outside temperature. b. Clean and lubricate daily and keep muzzle and receiver covered. c. Keep weapon free of moisture and close to outside temperature. d. Inspect daily. Continued on next page

MCI Course 8017A

2-21

Study Unit 2, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8

MCI Course 8017A

Answer b c a d a c b b

2-22

Reference Page 2-14 2-15 2-17 2-18 2-18 2-18 2-18 2-19

Study Unit 2, Lesson 2 Exercise

LESSON 3 ASSEMBLING, CONDUCTING THE FUNCTION CHECK, AND FIRING Introduction

Estimated Study Time

30 minutes

Lesson Scope

This lesson discusses how to assemble, perform a function check, and accurately fire the M203 grenade launcher.

Learning Objectives

After completing this lesson, you should be able to ·

Identify the steps to assemble the M203 grenade launcher.

·

Identify the steps to perform a function check on the M203 grenade launcher.

·

Identify the steps to load M203 grenade launcher.

·

Identify the three methods to firing the M203 grenade launcher.

·

Identify the steps to adjust the sight leaf on the M203 grenade launcher.

·

Identify the steps to adjust the quadrant sight on the M203 grenade launcher. Continued on next page

MCI Course 8017A

2-23

Study Unit 2, Lesson 3

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction Assembling Performing a Function Check Loading Firing Adjusting and Operating the Leaf Sight Adjust and Operating the Quadrant Sight Lesson 3 Exercise

MCI Course 8017A

2-24

See Page 2-23 2-25 2-26 2-28 2-29 2-30 2-33 2-35

Study Unit 2, Lesson 3

Assembling

Procedure

After you have cleaned your M203 grenade launcher, you are ready to assemble your weapon. To assemble the M203 grenade launcher, replace the parts in the reverse order of disassembly as shown in the table below. Step 1

MCI Course 8017A

Action Depress the barrel stop and slide the barrel assembly onto the receiver and close.

2

Install the handguards and secure them with the slip ring.

3

Mount the quadrant sight bracket and the quadrant sight assembly on the carrying handle of the service rifle. Tighten the mounting screw.

2-25

Study Unit 2, Lesson 3

Performing a Function Check

Purpose

Perform a function check to be sure that your M203 grenade launcher works. The areas you must inspect to perform a function check are the · ·

Safety and Trigger

Safety and trigger Barrel stop and barrel latch

To check the safety and trigger follow the steps listed in the table below: Step 1

2 3 4

Action Cock the launcher and squeeze the trigger.

Result You should hear the firing pin release.

Hold the trigger to rear and cock the launcher. Release the trigger and then squeeze trigger again. Cock the launcher and check that the safety moves to the safe and fire positions.

N/A Firing pin should release. Doing this checks that the sear is functioning properly to ensure launcher does not accidentally fire. Note: The launcher must be cocked before the safety can be placed in the safe position.

Continued on next page

MCI Course 8017A

2-26

Study Unit 2, Lesson 3

Performing a Function Check, Continued

Barrel Stop and Barrel Latch

MCI Course 8017A

Move the barrel forward and backward. Check that the stop and latch function properly, locking the barrel open and closed.

2-27

Study Unit 2, Lesson 3

Loading

Procedure

To load the M203 grenade launcher, follow the steps in the table below. Step 1

MCI Course 8017A

Action Move the safety to the safe position.

2

Press the barrel latch and slide the barrel forward.

3

Insert ammunition into the chamber.

4

Slide the barrel closed until it locks.

2-28

Study Unit 2, Lesson 3

Firing

Three Methods

The three methods of firing the M203 grenade launcher are the · · ·

Rifle Sight Method

Rifle sight methods Leaf sight method Quadrant sight method

To engage targets under 50 meters, lower the leaf sight and use the rifle sights, aiming at the foot of the target, as shown below.

Continued on next page

MCI Course 8017A

2-29

Study Unit 2, Lesson 3

Firing, Continued

Leaf Sight Method

To engage targets between 50 and 250 meters, use the leaf sight and front sight post of the M16A2 rifle as shown below.

Continued on next page

MCI Course 8017A

2-30

Study Unit 2, Lesson 3

Firing, Continued

Adjust Leaf Sight

To adjust leaf sight, follow the steps in the table below. Step Action 1 To change the range of point of impact, loosen the elevation adjustment screw and adjust the leaf sight as follows: · ·

To increase the range, raise the leaf sight. To decrease range, lower the leaf sight.

Notes: One increment equals 10 meters at 200 meters. Use the rim of a used 40-mm cartridge to turn the elevation adjustment screw. 2

To change the point of impact horizontally, turn the sight windage screw · ·

Clockwise to adjust for wind from the left. Counterclockwise to adjust for wind from the right.

Note: One increment equals 1.5 meters at 200 meters. Continued on next page

MCI Course 8017A

2-31

Study Unit 2, Lesson 3

Firing, Continued

Leaf Sight Components

The components of the sight leaf are illustrated in the picture below.

Leaf Sight Picture Alignment

Align the target with the 200-meter range increment of the sight leaf and the front sight post.

Continued on next page

MCI Course 8017A

2-32

Study Unit 2, Lesson 3

Firing, Continued

Quadrant Sight Method

The gunner uses the quadrant sight to engage targets from 50 to 400 meters.

Adjusting the Quadrant Sight

To adjust the quadrant sight, follow the steps in the table below. Step Action 1 To adjust elevation, pull the latch on the quadrant sight arm toward you and release it at the selected elevation.

2

Note: One notch equals 5 meters at 200 meters. To adjust for headwind and rear wind, turn the front sight post.

3

· Left to increase range. · Right to decrease range. To adjust for left and right wind · ·

Depress the retainer and slide the rear aperture in to adjust for wind from the right. Slide the rear aperture out to adjust for wind from the left.

Note: The vertical line marks the center. One notch equals 1.5 meters at 200 meters. Continued on next page

MCI Course 8017A

2-33

Study Unit 2, Lesson 3

Firing, Continued

Quadrant Sight

The diagram below shows the quadrant sight and its major components.

Quadrant Sight Alignment

Align front sight post of quadrant sight and M16A2 front sight post, centered within rear aperture on the quadrant sight arm.

MCI Course 8017A

2-34

Study Unit 2, Lesson 3

Lesson 3 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 5 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

What are the steps the gunner must perform to assemble the M203 grenade launcher? a. b. c. d.

Item 2

The areas to inspect while performing a function check on the M203 grenade launcher are the barrel stop, barrel latch, trigger, and the a. b. c. d.

Item 3

The reverse steps of disassembly Same steps as disassembly The quickest method Steps according to unit SOP

breech assembly. receiver tracks. quadrant sight assembly. safety.

What is the first step to load the M203 grenade launcher? a. b. c. d.

Slide the barrel forward. Move the safety to safety position. Set range on leaf sight. Cock weapon. Continued on next page

MCI Course 8017A

2-35

Study Unit 2, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Item 4

The gunner uses leaf sight method of fire to engage to engage targets at what ranges in meters? a. b. c. d.

Item 5

To adjust the elevation adjustment screw on M203 leaf sight, the gunner uses a a. b. c. d.

Item 6

50-150 50-400 50-300 50-250

screwdriver. multipurpose tool. used 40 mm cartridge. cleaning rod handle.

When engaging targets with the quadrant sight, what must you do to adjust the elevation or range to target? a. Pull the latch on quadrant sight arm toward you and release at the selected elevation. b. Move the rear sight aperture right or left. c. Move the front sight post away from or toward the barrel. d. Move the rear sight aperture away from or toward the barrel. Continued on next page

MCI Course 8017A

2-36

Study Unit 2, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6

MCI Course 8017A

Answer a d b d c a

2-37

Reference Page 2-25 2-26 2-28 2-30 2-31 2-33

Study Unit 2, Lesson 3 Exercise

(This page intentionally left blank.)

MCI Course 8017A

2-38

Study Unit 2, Lesson 3 Exercise

LESSON 4 STOPPAGES, IMMEDIATE ACTION, AND EMPLOYMENT Introduction

Estimated Study Time

25 minutes

Lesson Scope

The objective of this lesson is to teach you how to identify stoppages and their causes, perform immediate action, and identify the offensive and defensive capabilities of the M203 grenade launcher.

Learning Objectives

After completing this lesson, you should be able to ·

Define a stoppage of the M203 grenade launcher.

·

Identify the steps for immediate action on the M203 grenade launcher.

·

Identify criteria for employing the M203 grenade launcher. Continued on next page

MCI Course 8017A

2-39

Study Unit 2, Lesson 4

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction Stoppages Immediate Action Employment Lesson 4 Exercise

MCI Course 8017A

2-40

See Page 2-39 2-41 2-42 2-43 2-45

Study Unit 2, Lesson 4

Stoppages

Definitions

A stoppage is any unintentional interruption in the functioning of the weapon. A failure to fire can be a ·

Hangfire. A hangfire is a delay in the functioning of a propelling charge explosive train at the time of firing.

·

Misfire. A misfire is a complete failure to fire. A misfire itself is not dangerous but since it cannot be immediately distinguished from a hangfire, you must consider it a hangfire until proven otherwise.

WARNING: The amount of delay for a hangfire is unpredictable. Consider all stoppages to be hangfires until proven otherwise. Common Stoppages and Their Causes

The table below lists common M203 grenade launcher stoppages and their causes. STOPPAGE Failure to fire

Failure to extract Failure to chamber Failure to lock

MCI Course 8017A

CHECK FOR Too much water or oil in back of breech insert Dirt or residue in firing pin hole Dirt in locator slot Faulty ammunition Casing stuck in barrel Faulty ammunition or dirty chamber Dirty follower or receiver cavity

2-41

HOW TO FIX IT Point weapon up 30 seconds and hand function. Clean Clean Replace. Remove with rifle cleaning rod. Replace ammunition or clean bore and chamber. See unit armorer.

Study Unit 2, Lesson 4

Immediate Action

Definition

Immediate action is the unhesitating application of a probable remedy when you have not definitely identified the actual cause of a stoppage.

Procedure

Because of the possibility of a misfire or hangfire, use caution while you perform immediate action procedures. To apply immediate action, complete the steps in the following table. Step 1

Action Shout “Misfire,” keeping the weapon pointed down range. Be sure all Marines are clear of the muzzle. Note: Shouting misfire should apply only to training situations. Before you try to remove the ammunition from the grenade launcher, clear Marines not required for the operation from the vicinity. Wait 30 seconds from the time of failure before opening the breech to unload. Catch the ejected ammunition or reduce the distance of free fall to the ground. Determine if the removed ammunition or the firing mechanism are defective by examining the WARNING:

2 3 4

· ·

5

MCI Course 8017A

Primer of the ammunition for dents Firing mechanism

Note: If the primer has not been dented, then the firing mechanism is at fault. After the cause of the failure to fire has been corrected, reload the ammunition and continue firing. If the primer has been dented, keep the round separate from other ammunition and follow the unit SOP for disposal.

2-42

Study Unit 2, Lesson 4

Employment

Trajectory

In employing the M203 grenade launcher to its maximum capability, you must understand the trajectory of rounds, effects of the ammunition, and the methods of firing. At ranges up to 150 meters, the M203 grenade launcher has a relatively flat trajectory. Therefore, you can fire the M203 grenade launcher from your shoulder in the normal manner. However, as the range increases, the height of the trajectory and the time of flight of the projectile increase.

Effects of M203 Grenade Launcher Fire

The effective casualty radius is the radius of a circle around the point of detonation. Since the high explosive grenade has an effective casualty radius of 5 meters, you can expect 50 percent of exposed troops to become casualties.

Offensive Employment

The grenadier can use the M203 grenade launcher offensively to · ·

Destroy groups of enemy personnel Provide close fire support in an assault together with other supporting fires

The fire team leader/grenadier selects targets and delivers the M203 grenade launcher fires during the attack. The grenadier may fire high explosive (HE) ammunition only at targets far enough away so that the exploding HE will not endanger the assaulting squad. In the last 35 meters of an assault (when M203 grenade launcher fires may endanger friendly assaulting troops), the grenadier should employ the multiprojectile antipersonnel ammunition. During an assault, the grenadier can employ the M16A2 rifle until suitable targets appear or until there is time to reload the M203 grenade launcher. Continued on next page

MCI Course 8017A

2-43

Study Unit 2, Lesson 4

Employment, Continued

Suitable Targets

Suitable M203 grenade launcher targets are · · ·

Defensive Employment

Enemy automatic rifle positions Machinegun positions Other crew-served weapons within the fire team sector

Defensively, your firing position should enable you to deliver M203 grenades over the entire team sector. Primary and supplementary positions that you prepare in the defense must provide maximum cover and concealment consistent with the assigned mission. WARNING:

You must be sure that fields of fire are cleared of obstructions that might cause premature detonation of a projectile.

As the enemy approaches your unit’s defensive position, your goal is to subject them to an ever-increasing volume of fire. Initially, you should use your rifle. Use of Grenade Launcher

As the enemy gets nearer to friendly positions, use your grenade launcher to fire on enemy · ·

Automatic weapons Troops in defilade

This will silence an enemy base of fire and cause enemy troops to leave covered positions. Then automatic rifle fire can engage them.

MCI Course 8017A

2-44

Study Unit 2, Lesson 4

Lesson 4 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 6 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

A stoppage is defined as a. b. c. d.

Item 2

Before opening the breech to unload after a misfire, wait a. b. c. d.

Item 3

improperly loaded ammunition into the weapon. any unintentional interruption in the functioning of a weapon. waiting for 40 seconds and clearing the weapon. having an ammunition casing stuck in the breech.

15 seconds. 30 seconds. 1 minute. 3 minutes.

To employ the M203 grenade launcher, you must understand the trajectory of rounds, effects of the ammunition, and a. b. c. d.

how to engage targets. the methods of firing. defensive firing. offensive employment. Continued on next page

MCI Course 8017A

2-45

Study Unit 2, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Item 4

The trajectory of the M203 is relatively flat at ranges up to ______ meters. a. b. c. d.

Item 5

Offensively, in the last 35 meters of an assault, use ______ ammunition in the M203 grenade launcher. a. b. c. d.

Item 6

100 150 200 250

HE explosive multiprojectile antipersonnel TP BAW

Defensively, be sure fields of fire are cleared of obstructions because they a. b. c. d.

subject you to an increasing volume of fire. provide cover and concealment to the enemy. might cause premature detonation of a projectile. become targets of enemy fire. Continued on next page

MCI Course 8017A

2-46

Study Unit 2, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6

MCI Course 8017A

Answer b b b b b c

2-47

Reference Page 2-41 2-42 2-43 2-43 2-43 2-44

Study Unit 2, Lesson 4 Exercise

(This page intentionally left blank)

MCI Course 8017A

2-48

Study Unit 2, Lesson 4 Exercise

STUDY UNIT 3 M249 SQUAD AUTOMATIC WEAPON (SAW) Overview

Estimated Study Time

1 hour, 25 minutes

Unit Scope

This study unit will teach you the characteristics, operation, maintenance, immediate action, care and cleaning techniques, and firing procedures for the M249 squad automatic weapon (SAW).

Learning Objectives

After completing this unit, you should be able to ·

Identify the characteristics of the M249 SAW.

·

Identify how to maintain the M249 SAW.

·

Identify how to engage a target with the M249 SAW.

· Identify how to troubleshoot malfunctions and stoppages on the M249 SAW. In This Study Unit

This study unit contains the following lessons:

Lesson 1 Lesson 2 Lesson 3 Lesson 4

MCI Course 8017A

Topic Description Clearing, Disassembling, and Cleaning Assembling, Performing the Function Check and Mounting Using the SAW

3-1

See Page 3-5 3-15 3-39 3-51

Study Unit 3

(This page intentionally left blank.)

MCI Course 8017A

3-2

Study Unit 3

LESSON 1 DESCRIPTION Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson teaches you the basic characteristics of the M249 squad automatic weapon (SAW) and the ammunition it uses.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the capabilities of the M249 SAW.

·

Describe the characteristic of the M249 SAW.

·

Identify the eight steps in the cycle of operation for the M249 SAW.

·

Identify the standard types of ammunition for the M249 SAW based on color and use.

This lesson contains the following topics: Topic Introduction Role and Capabilities General Characteristics Cycle of Operation Ammunition Lesson 1 Exercise

MCI Course 8017A

3-3

See Page 3-3 3-4 3-5 3-9 3-10 3-11

Study Unit 3, Lesson 1

Role and Capabilities

Role

The M249 squad automatic weapon (SAW) is the fire team’s primary automatic weapon. The SAW supports the squad in the offense and the defense by providing a heavy volume of suppressive fire.

Capabilities

The capabilities of the SAW are listed below. ·

The SAW provides · ·

·

The SAW supports · ·

·

MCI Course 8017A

Long-range, close defensive, and final protective fires as part of the squad's defensive lines Close and continuous fire in support of front-line rifle squads

Rear security and special missions The advance of the squad by fire in the offense

The SAW supplements other supporting fires.

3-4

Study Unit 3, Lesson 1

General Characteristics

M249 Squad Automatic Weapon (SAW)

Below is a picture of the M249 SAW, the only automatic weapon at the squad level to support primary fire team.

Weight

The following table lists the approximate weights (in pounds) of the M249 SAW and box of 5.56 ammo. Item Weapon (with bipod and tools) 200-round box (filled)

Length

Weight (in pounds) 17 6.92

The length of the M249 SAW is 40.75 inches. Continued on next page

MCI Course 8017A

3-5

Study Unit 3, Lesson 1

General Characteristics, Continued

Range

The following table lists the range (in meters) for the M249 SAW. Type of Range Maximum Maximum Effective

Rate of Fire

Range (in meters) 600 Area target: 1,000 Point target: 800 Grazing fire: 600

The following table lists the rate of fire (in rounds per minute) for the M249 SAW. Rate of Fire Cyclic Sustained Rapid

Rounds per Minute 850 50 100 Continued on next page

MCI Course 8017A

3-6

Study Unit 3, Lesson 1

General Characteristics, Continued

Sights

The following table lists the types of sights for the M249 SAW. Sight Front

Semi-fixed hooded post

Type

Rear

Fully adjustable peep type

Continued on next page

MCI Course 8017A

3-7

Study Unit 3, Lesson 1

General Characteristics, Continued

Descriptive Characteristics

The M249 SAW is ·

Gas-operated. Gas taken from the barrel acts on a piston directly fixed to the bolt carrier (slide). A single piston controls the gas pressure.

·

Air-cooled. The barrel is air-cooled and has a fixed head space. No special cooling measures are required. The normal outside temperature provides adequate cooling in any climate.

·

Belt- or magazine-fed. The M249 SAW uses a 200-round ammunition box consisting of a combat mix of linked ammunition under usual conditions. During firing, the links disengage and feeding is continuous. The weapon has an alternate 30-round magazine provision authorized only during emergency situations. Using the 30-round magazine reduces the performance of the weapon.

Note:

MCI Course 8017A

The M249 SAW fires from the open bolt position. The bolt is a multiple-lug type that rotates into a positive locked position in the barrel extension before firing.

3-8

Study Unit 3, Lesson 1

Cycle of Operation

Eight Steps

The cycle of operation for the M249 SAW consists of eight steps shown in the table below. Step 1

2 3

4 5

6 7

8

MCI Course 8017A

Action Feeding: Feeding takes place as the operator places a belt of ammunition on the feed tray or inserts a loaded magazine in the magazine well. A cartridge is placed in the path of the bolt so that as the bolt is driven forward from the force of the expanding driving spring, the face of the bolt makes contact with the rim of the first cartridge and strips it from the links or magazine. Chambering: Occurs as the bolt continues to move forward and forces the cartridge into the barrel chamber. Locking: The locking lugs and bolt face make contact with the rear of the chamber, the forward movement of the bolt stops, and the slide assembly pushes the rotating lug of the bolt to the right. This rotation of the bolt causes the locking lugs to disalign with the locking recesses. Firing: The firing pin then strikes the primer of the cartridge. Unlocking: Expanding gases from the ignited propellant are vented off through the gas port in the gas regulator. The pressure of the expanding gases is directed rearward through the gas cylinder and forces the piston assembly, slide assembly, and bolt to the rear. Extracting: The bolt moves rearward and the cartridge case is pulled from the chamber. Ejecting: The ejector strikes the upper left of the base of the cartridge, just as the bolt face clears the rear of the ejection port, causing the cartridge case to pivot over the extraction claw and to be thrown clear of the receiver. Cocking: As the bolt continues its movement to the rear, the piston assembly compresses the driving spring. Cocking is completed when the spring is fully compressed.

3-9

Study Unit 3, Lesson 1

Ammunition Four Types

The M249 SAW fires various types of 5.56mm ammunition. The recommended combat mix of SAW ammunition is four M855 ball ammunition rounds to one M856 tracer round. Unlike the standard 5.56mm ammunition you use with the M16A2 service rifle, some of these rounds are color coded. The table below shows the four standard types of M249 SAW ammunition and the color and purpose of each type. Type M855 (Ball)

MCI Course 8017A

Color

Used For Anti-personnel and light materials

M856 (Tracer)

Signaling, incendiary effects, and anti-personnel

M232 (Dummy)

Mechanical training, dry-fire exercises, and function checks

M200 (Blank)

Training evolutions

3-10

Study Unit 3, Lesson 1

Lesson 1 Exercise

Estimated Study Time

15 minutes

Directions

Complete items 1 through 12 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

A capability of the M249 squad automatic weapon is to provide long-range, close defensive, and final protective fires as part of the squad’s defensive lines and to a. b. c. d.

Item 2

provide special capabilities. provide close and continuous fire in support of front-line rifle squads. support additional power for adverse conditions. provide support but only during emergency situations.

What is the maximum effective range in meters of the M249 SAW against an area target? a. b. c. d.

600 800 1,000 1,100 Continued on next page

MCI Course 8017A

3-11

Study Unit 3, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Items 3 Through 7

Item 8

Matching: In the space provided, place the letter of the step in the cycle of operation for the M249 SAW from column 2 in the correct sequence in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Correct Sequence

Steps in Cycle of Operation

___ 3. ___ 4. ___ 5. ___ 6. ___ 7.

a. b. c. d. e.

The recommended combat mix of M249 SAW ammunition is four a. b. c. d.

Items 9 Through 12

MCI Course 8017A

Chambering/Locking Ejecting/Cocking Feeding Firing Unlocking/Extracting

M196 tracer rounds to one M193 ball round. M200 blank rounds to one M855 ball round. M855 ball rounds to one M856 tracer round. M856 tracer rounds to one M199 dummy round.

Matching: In the space provided, place the letter of the type of M249 ammunition from column 2 that best matches the color or use in column 1. The answers in column 2 may be used more than once. Column 1

Column 2

Color or Use

Type of Ammunition

___ 9. Orange ___ 10. Function check ___ 11. Antipersonnel or light material. ___ 12. Training evolutions.

a. b. c. d.

3-12

M199 Dummy M855 Ball M200 Blank M856 Tracer

Study Unit 3, Lesson 1 Exercise

Lesson 1 Exercise Solutions

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8 9 10 11 12

MCI Course 8017A

Answer b c c a d e b c d a b c

3-13

Reference Page 3-4 3-6 3-9 3-9 3-9 3-9 3-9 3-10 3-10 3-10 3-10 3-10

Study Unit 3, Lesson 1 Exercise

(This page intentionally left blank)

MCI Course 8017A

3-14

Study Unit 3, Lesson 1 Exercise

LESSON 2 CLEARING, DISASSEMBLING, AND CLEANING Introduction

Estimated Study Time

30 minutes

Lesson Scope

The objective of this lesson is to teach you how to clear, disassemble, and clean the M249 squad automatic weapon (SAW).

Learning Objectives

After completing this lesson, you should be able to ·

Identify the steps to clear the M249 SAW.

·

Identify the components of the M249 SAW and their functions.

·

Identify the steps to disassemble the M249 SAW.

·

Identify the cleaners/lubricants by use for the M249 SAW.

·

Identify precautions for the care of the M249 SAW in extreme environments. Continued on next page

MCI Course 8017A

3-15

Study Unit 3, Lesson 2

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction Clearing Components Disassembling Cleaning and Care Lesson 2 Exercise

MCI Course 8017A

3-16

See Page 3-15 3-17 3-19 3-21 3-29 3-34

Study Unit 3, Lesson 2

Clearing

Steps

Before you begin to disassemble any weapon, you must first check to ensure there is no ammunition present. The below table lists the steps to clear the M249 SAW. Step 1

Action Pull the cocking handle to the rear with the right hand and lock the bolt to the rear. Push the cocking handle forward until it clicks.

2

Push the safety from left to right. Red should not be visible on the safety.

Continued on next page

MCI Course 8017A

3-17

Study Unit 3, Lesson 2

Clearing, Continued

Steps, continued

Step 3

Action Remove the ammunition by raising the cover assembly or depressing the magazine release tab to remove the M16 magazine from the cover assembly

OR

4 5 6 7

Raise the feed tray. Inspect the chamber and receiver to ensure that all ammunition and links have been removed. Close the cover assembly and lock it. Push the safety from right to left (red now visible). Move cocking handle to the rear, squeeze the trigger, and ride the bolt home. Note:

MCI Course 8017A

Never allow the bolt to slam home on an empty chamber. Doing so will damage the weapon.

3-18

Study Unit 3, Lesson 2

Components

Major Parts

After you clear the M249 SAW, you are ready to disassemble it. The M249 SAW can be disassembled into its major components, shown on the figure below. Each component is described in the table on the next page.

Continued on next page

MCI Course 8017A

3-19

Study Unit 3, Lesson 2

Components, Continued Major Parts, continued

The table below lists the M249 SAW components and their uses. The references are to the picture on the previous page. Picture Component Reference A Barrel B C

D E F G H I J K L M N

MCI Course 8017A

Function

Housing the cartridge for firing and supporting the front sights Rear sight Adjusting impact of the round for both windage and elevation Cover, feed Feeding the link belt ammunition into mechanism, and feed the weapon and holding cartridges in tray pawl position for striking, feeding, and chambering Cocking handle Pulling the moving parts to the rear Buttstock, shoulder, Serving as a shoulder support for and folding shoulder aiming and firing the weapon rest Piston Transferring power from propelling gases to the bolt slide assembly to operate the weapon Bolt Feeding, stripping, chambering, firing, and extracting using propellant gases Slide Housing the firing pin and roller assembly Operating rod Absorbing recoil from the bolt and operating rod assembly at the end of recoil movement Receiver Supporting all major components and controlling the functioning of the weapon Trigger mechanism Controlling the firing of the weapon Handguard Providing thermal insulation to protect the operator's hands from heat and housing the cleaning equipment Bipod Supporting the weapon in a prone and sitting position Gas cylinder Locking the bipod in place on the receiver and providing a passageway for operating gases

3-20

Study Unit 3, Lesson 2

Disassembling

Procedures

Now that you are familiar with the components of the M249 SAW, you can start to disassemble the weapon into its main groups: · · · · · · · · ·

Operating rod assembly Slide assembly and bolt Heat shield Barrel assembly Gas regulator Handguard Gas cylinder Buttstock and shoulder assembly Trigger mechanism

Note: Operating Rod Assembly

Before disassembly begins, ensure the bipod legs are locked open.

The following table lists the steps to remove the operating rod assembly of the M249 SAW. WARNING: Be sure the bolt is in the forward position before disassembly of the M249 SAW. The guild rod can cause death or injury if the guide spring is retracted with bolt pulled to rear. Continued on next page

MCI Course 8017A

3-21

Study Unit 3, Lesson 2

Disassembling, Continued

Removing the Operating Rod Assembly

Be sure you have read the warning on the previous page. Look at the first step listed in the table below. Step 1

2

Action Pull the upper retaining pin at the rear of the receiver to the left and allow the buffer and buttstock assembly to pivot downward.

Remove the operating rod assembly from the receiver by pressing inward and up on the rear of the operating rod with one thumb. Slowly let the drive spring expand and remove it from the receiver. Separate the drive spring and operating rod.

Continued on next page

MCI Course 8017A

3-22

Study Unit 3, Lesson 2

Disassembling, Continued Slide Assembly and Bolt

The table below lists the steps to remove the slide assembly and bolt.

Step 1

2

Action Pull the cocking handle to the rear. Slide the moving parts out and set them aside.

Separate the bolt from the slide assembly by rotating the bolt counterclockwise to disengage the lug. Pull the bolt forward off the slide assembly.

Note: When you remove the bolt, the firing pin spring is free. Be sure you don’t lose it. Continued on next page

MCI Course 8017A

3-23

Study Unit 3, Lesson 2

Disassembling, Continued

Slide Assembly and Bolt, continued

Step 3

Heat Shield

Action Separate the slide assembly from the piston using the spring guide to press the retaining pin at the rear of the piston to the left. Lift the slide assembly upward.

Hold the weapon firmly, grasp the heat shield just forward of the barrel handle, and lift the heat shield off the barrel.

Continued on next page

MCI Course 8017A

3-24

Study Unit 3, Lesson 2

Disassembling, Continued

Barrel Assembly

The table below lists the steps to remove the barrel assembly of the M249 SAW. Step 1 2 3

Action Close the cover. Depress the locking lever of the barrel using your left hand. Hold the carrying handle with your right hand, lift the barrel up, and push the barrel forward as shown in the picture below.

Continued on next page

MCI Course 8017A

3-25

Study Unit 3, Lesson 2

Disassembling, Continued

Gas Regulator

The table below lists the steps to remove the gas regulator of the M249 SAW. Step 1

Action Rotate the gas collar pin out of the notch by placing the tip of the scraper with the concave side inside the notch.

2

Rotate the collar counterclockwise over the concave portion of the tip on the scraper and past the notch until the collar slides off.

3

Remove the gas regulator by pulling to separate it from the gas block.

Continued on next page

MCI Course 8017A

3-26

Study Unit 3, Lesson 2

Disassembling, Continued

Removing the Handguard

The table below lists the steps to remove the handguard from the M249 SAW. Step 1

Gas Cylinder

Action Push the retaining pin on the handguard from right to the left using the cleaning rod section and pull the handguard down and away to separate it from the receiver.

To remove the bipod and gas cylinder, turn the gas cylinder to the left or right until you hear a click. Pull the gas cylinder forward and separate it from the bipod.

Continued on next page

MCI Course 8017A

3-27

Study Unit 3, Lesson 2

Disassembling, Continued

Removing the Buttstock and Shoulder Assembly

Press the lower retaining pin to the left and separate the buffer and buttstock assembly from the receiver.

Removing the Trigger Mechanism

With the lower retaining pin still to the left, pull downward and to the rear on the handgrip to remove the rigger mechanism assembly from the receiver.

MCI Course 8017A

3-28

Study Unit 3, Lesson 2

Care and Cleaning Action

Proper care of the M249 SAW consists of three actions. · · ·

When to Clean

Cleaning Inspecting Lubricating

You need to conduct care and cleaning on a regular basis. · · ·

After firing At least daily under combat/field conditions Weekly when the gun is in storage

Cleaning and Lubricating Materials

The only authorized cleaner and lubricating materials on the M249 SAW is CLP. No other cleaners or abrasives are authorized.

Cleaning Kit

The M249 SAW is designed to hold a cleaning kit in the handguard. The kit includes the following tools: · · · · · ·

Scraper Tool Cleaning Rod Handle Rod Section (2) Chamber Brush Bore Brush Swab Holder

Continued on next page

MCI Course 8017A

3-29

Study Unit 3, Lesson 2

Care and Cleaning, Continued

Cleaning M249 SAW’s Barrels

The M249 SAW's barrels are cleaned in the same way as the M12A2 service rifle. The table below list the procedures to clean, inspect, and lubricate. Step 1 2 3 4

Action Clean the bore and chamber using CPL and fresh swabs. Wipe all metal components and surfaces that have been exposed to powder fouling. Inspect by looking for cracks, dents, burrs, or other damage. Lubricate by applying a light coat of lubricant to all parts. Generously lubricate the moving parts to reduce friction during operation. Note:

Cleaning M249 SAW’s Receiver Group

Do not lubricate the top or face of the bolt.

Clean the receiver and cover assembly using a general purpose bush and M60E3 machine gun receiver brush. The table below list the procedures to clean, inspect, and lubricate. Step 1 2 3 4 5 6

Action Wipe all metal components and surfaces. Look for cracks, dents, burrs, or other damage. The windage and elevation knobs on the rear sight should be movable and legible. Ensure scale screws are not worn or burred. Check springs and moving parts for weak or binding action. Lubricate by applying a moderate coat of CLP on the slide rails and moving parts. Place a light coat of CLP on rear sight and exercise the windage and elevation knobs. Continued on next page

MCI Course 8017A

3-30

Study Unit 3, Lesson 2

Care and Cleaning, Continued

Cleaning the The gas system includes the regulator, cylinder, gas block, and piston. The M249 SAW’s Gas table below lists the procedures to clean and inspect the gas system. Wipe System the parts dry; do not use any type of oil to lubricate the system.

Step 1

Action Remove all carbon from the gas regulator by using the scraper tool as shown below. Remove carbon from the following locations: The gas vent holes

The central hole

The groves of the body

Continued on next page

MCI Course 8017A

3-31

Study Unit 3, Lesson 2

Care and Cleaning, Continued

Cleaning the M249 SAW’s Gas System, continued

Step 2

Action Clean the front interior of the gas cylinder by inserting and turning the flat side of the scraper in a circular motion as shown in the picture below.

3

Use the scraper tool as shown below to clean the grooves and front hole cleans the piston.

Continued on next page

MCI Course 8017A

3-32

Study Unit 3, Lesson 2

Care and Cleaning, Continued

Inspection and Lubrication

To inspect and lubricate the M249 SAW, do the following: Step 1 2

Extreme Environments

Action Look for cracks, dents, burrs, or other damage. Wipe dry with clean cloth. Do not apply oil to gas system.

In extreme environments, you must take extra precautions to be sure your M249 SAW operates trouble-free. The following table shows the precautions you must take for each environmental condition. Environment Damp or salty air

· · ·

Hot, dry, and sandy

· · ·

Cold, snowy, and icy

· · · ·

MCI Course 8017A

3-33

Precautions Inspect the weapon frequently for rust. Keep the weapon as moisture-free as possible. Field-strip, clean, and lubricate the weapon more often. Use a generous coat of lubricant. Clean and lubricate more often. Wipe the weapon dry. Do not use extra lubricant because the grit and dust will stick to the parts. Cover the weapon when not in use. Cover the weapon when outside. Keep the weapon away from direct heat when inside. If the metal sweats, dry and lubricate the parts. Lubricate enough so that it can be spread with finger.

Study Unit 3, Lesson 2

Lesson 2 Exercise

Estimated Study Time

15 minutes

Directions

Complete items 1 through 13 by performing the action. Check your answers against those listed at the end of this lesson.

Item 1

To clear the M249 SAW, charge the weapon by pulling the cocking handle to the rear, pushing the charging handle forward until it clicks, and a. b. c. d.

Items 2 Through 5

locking the bolt to the rear. being sure the charging handle “clicks.” being sure the red ring is visible. pushing the safety to the right.

Matching: In the space provided, place the letter of the function in column 2 that best matches the component of the M249 SAW in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Component of M249 SAW

Function

___ 2. ___ 3. ___ 4. ___ 5.

a. Feeding, stripping, chambering, firing, and extracting using propellant gases b. Housing firing pin and roller assembly c. Transferring power from propelling gases to the bolt slide assembly d. Locking the bipod in place on the receiver and providing a passageway for operating gases

Piston Gas cylinder Bolt Slide

Continued on next page

MCI Course 8017A

3-34

Study Unit 3, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Item 6

Disassembling the M249 SAW consists of removing _____ main groups. a. b. c. d.

Items 7 Through 10

Item 11

7 8 11 14

Matching: In the space provided, place the letter of the steps to dissemble the M249 SAW in column 2 in the correct sequence in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Correct Sequence

Steps

___ 7. ___ 8. ___ 9. ___ 10.

a. b. c. d.

Heat shield Barrel assembly Slide and bolt assembly Operating rod assembly

Which cleaner/lubricant is the only authorized lubricating for the M249 SAW? a. b. c. a.

CLP RBC LSA LAW Continued on next page

MCI Course 8017A

3-35

Study Unit 3, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Item 12

The procedures for proper care of the M249 SAW are a. b. c. d.

Item 13

cleaning, inspecting, and lubricating. cleaning and lubricating. cleaning and inspecting. disassembling, cleaning, and lubricating.

Which precautionary measures must you take for the M249 SAW in a damp or salty environment? a. Inspect frequently for rust; field-strip, clean and lubricate more often; and use generous coat of lubricant. b. Clean and lubricate more often; wipe weapon dry; and cover weapon when not in use. c. Cover weapon when outside; dry and lubricate parts before taking outside; and wipe the weapon dry. d. Cover weapon and generously lubricate before taking outside.

MCI Course 8017A

3-36

Study Unit 3, Lesson 2 Exercise

Lesson 2 Exercise Solutions

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8 9 10 11 12 13

MCI Course 8017A

Answer` d c d a b b d c a b a a a

3-37

Reference Page 3-17 3-20 3-20 3-20 3-20 3-21 3-22 3-23 3-24 3-25 3-29 3-29 3-33

Study Unit 3, Lesson 2 Exercise

(This page intentionally left blank.)

MCI Course 8017A

3-38

Study Unit 3, Lesson 2 Exercise

LESSON 3 ASSEMBLING, PERFORMING THE FUNCTION CHECK, AND MOUNTING Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson teaches you how to assemble, perform a function check, and mount the M249 squad automatic weapon (SAW).

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the steps to assemble the M249 SAW.

·

Identify the steps to perform a function check on the M249 squad SAW.

·

Identify the steps to engage the M249 SAW bipod.

This lesson contains the following topics: Topic Introduction Assembling Performing a Function Check Engaging the Bipod Lesson 3 Exercise

MCI Course 8017A

3-39

See Page 3-39 3-40 3-47 3-48 3-49

Study Unit 3, Lesson 3

Assembling

Introduction

After you have cleaned your M249 SAW, you are ready to assemble your weapon. To assemble the M249 SAW, replace the parts in the reverse order of disassembly.

Bipod and Gas Cylinder

The table below lists the steps to assemble the bipod and gas cylinder on the M249 SAW. Step 1

Action Place the bipod on the receiver as shown in the picture below.

2 3

Push the gas cylinder through the bipod yoke into the receiver. Push the cylinder to the rear and guide the end of the cylinder into the receiver with your other hand as shown in the picture below.

4

Turn the cylinder until the spring clicks into the recess at the rear of the gas cylinder. Continued on next page

MCI Course 8017A

3-40

Study Unit 3, Lesson 3

Assembling, Continued

Handguard

The table below lists the steps to assemble the handguard on the M249 SAW. Step 1 2

Action Replace all cleaning equipment, if removed, in stowage areas. Place the handguard on the receiver and slide it backwards until it stops as shown in the picture below.

3 4

Push the handguard retaining pin to the right using the guide rod. Pull the handguard downward to check to see if it is properly secured as shown in the picture below.

Continued on next page

MCI Course 8017A

3-41

Study Unit 3, Lesson 3

Assembling, Continued

Gas Regulator

The table below lists the steps to attach the gas regulator to the M249 SAW. Step 1 2 3 4 5 6

Action Hold the barrel in one hand with the muzzle up. Insert the gas regulator into the lower end of the gas block hole. Align the notch in the regulator body with the notch in the gas block. Support the installed regulator body on a firm surface. Place the gas collar regulator on the protruding end of the body and align the spring with the stud. Firmly push downward and rotate the collar clockwise into the normal position as shown in the picture below.

Continued on next page

MCI Course 8017A

3-42

Study Unit 3, Lesson 3

Assembling, Continued

Barrel Assembly

The table below lists the steps to attach the barrel assembly to the M249 SAW. Step 1

Action Depress the locking lever with your left hand as shown in the picture below.

2 3 4

Hold the carrying handle with your right hand. Pull the barrel rearward. Push downward as shown in the picture below.

5 6

Lock the barrel into place by releasing the locking lever. Install the heat shield. Continued on next page

MCI Course 8017A

3-43

Study Unit 3, Lesson 3

Assembling, Continued

Trigger Mechanism

The table below lists the steps to attach the trigger mechanism to the M249 SAW. Step 1

2 Buttstock and Shoulder Assembly

Action Push the trigger mechanism upward to the receiver as shown in the picture below.

Push the retaining pins to the left.

The table below lists the steps to attach the buttstock and shoulder assembly to the M249 SAW. Step 1 2

Action Align the lower hole in the buttstock and shoulder assembly with the rear hole in the trigger mechanism. Push the lower pin to the right as shown in the picture below.

Continued on next page

MCI Course 8017A

3-44

Study Unit 3, Lesson 3

Assembling, Continued

Bolt and Slide Assembly

The table below lists the steps to attach the bolt and slide assembly to the M249 SAW. Step 1

2

Action Place the bolt carrier (slide) on the piston as shown in the picture below.

Push the retaining pin from the left to the right to secure it. Before you continue, be sure the firing pin spring is on the firing pin. Place the bolt in the bolt carrier. Press the firing pin spring to compress it. Rotate the bolt and hook its driving lug into the bolt carrier. Place the moving parts into the receiver with the feed cover open by placing the bolt lugs in the rails. Place the piston in the rear of the gas cylinder, simultaneously pressing the trigger with the forefinger as shown in the picture below. Note:

3 4 5 6

Note:

Step 6 ensures that the sear does not prevent the moving parts from going forward. Continued on next page

MCI Course 8017A

3-45

Study Unit 3, Lesson 3

Assembling, Continued

Operating Rod Assembly

The table below lists the steps to attach the operating rod assembly to the M249 SAW. Step 1 2

MCI Course 8017A

Action Hold the pistol grip with one hand and push the operating assembly into its housing in the rear with your other hand. Press in and down on the rear of the operating rod assembly until its two lugs are positioned in the receiver grooves as shown in the picture below.

3

Pivot the butt upward into position as shown in the picture below.

4

Push the retaining pin to the right and close the cover assembly.

3-46

Study Unit 3, Lesson 3

Performing a Function Check

Purpose

To ensure proper reassembly, the operator must perform a function check of the weapon.

Procedure

The table below lists the steps to perform a function check on the M249 SAW. Step 1 2 3 4 5 6

MCI Course 8017A

Action Grasp the cocking handle with the right hand, palm up, and pull the bolt to the rear, locking it in place. Push the cocking handle forward and lock it in place. Place the safety switch to SAFE and depress the trigger. Nothing should happen. Grasp the cocking handle and pull and hold it to the rear. Place the safety switch to FIRE and depress the trigger. Ease the bolt forward to prevent it from slamming into the chamber.

3-47

Study Unit 3, Lesson 3

Engaging the Bipod

Procedures

You can fire the M249 SAW in the prone position using the bipod group. The table below lists the steps to engage the bipod to support the machine gunner while firing. Step 1 2 3

MCI Course 8017A

Action Lower the bipod legs by holding the legs together and pulling them down and away from the handguard. Release the legs so that they lock in the vertical position. Extend the bipod legs by grasping the foot of each leg and pulling down.

3-48

Study Unit 3, Lesson 3

Lesson 3 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1through 3 by performing the action required and choose the best answer. Check your answers against those listed at the end of this lesson.

Item 1

Attaching the _______________ is the last procedure in the sequence for assembling the M249 SAW. a. b. c. d.

Item 2

bipod and gas cylinder assembly trigger mechanism assembly operating rod assembly buttstock and shoulder assembly

Which of the following is the first step in conducting a function check on the M249 SAW? a. Place the fire/safe switch on S and depress the trigger b. Grasp the cocking handle with the right hand, palm up, and pull the bolt to the rear locking it in place c. Open the cover d. Place the fire/safe switch on F and depress the trigger

Item 3

What is the first step to engage the M249 SAW’s bipod? a. b. c. d.

MCI Course 8017A

Lower bipod assembly legs Push in the locking pin Engage the front axis of the weapon Attach the 200-round box of ammunition

3-49

Study Unit 3, Lesson 3 Exercise

Lesson 3 Exercise Solutions

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer c b a

3-50

Reference Page 3-46 3-47 3-48

Study Unit 3, Lesson 3 Exercise

LESSON 4 USING THE SAW Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson covers the techniques for sighting, firing, and performing immediate action on the M249 squad automatic weapon (SAW).

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the components of the rear sight assembly for the M249 SAW.

·

Identify the procedures for firing the M249 SAW.

·

Identify the steps to perform immediate action for the M249 SAW.

This lesson contains the following topics: Topic Introduction Sighting Firing Malfunctions, Stoppages, and Immediate Action Lesson 4 Exercise

MCI Course 8017A

3-51

See Page 3-51 3-52 3-54 3-59 3-61

Study Unit 3, Lesson 4

Sighting

Sight Assembly

The M249 SAW has two sights that are used to aim the machinegun. ·

The front sight on the M249 SAW is located on the barrel assembly. It is a semifixed, hooded post-type sight.

·

The rear sight is a peep-type sight that is fully adjustable for windage and elevation correction, as shown below.

Continued on next page

MCI Course 8017A

3-52

Study Unit 3, Lesson 4

Sighting, Continued

Parts and Function

The table below lists the parts and function of the rear sight assembly. Part Windage Knob

Function To make adjustments for the effects of wind, traverse the rear sight across the sliding scale. ·

The sliding scale is marked with index lines that are equal to .5 mils.

·

Elevation Knob

Each line on the sliding scale is equal and moves the strike of the round almost 2 (1.97”) inches at 100 meters. To make adjustments for range, move the rear sight to the range settings that are marked from 300 to 1,000 meters. ·

Even numbers are marked on the left side of the scale and are numbered 4, 6, 8, 10.

·

Odd numbers are on the right side and are marked with the number 3 and three index lines, representing 300, 500, 700, 900 meters.

Notes: For fine adjustments in range, you can move the peep sight nine 180-degree turns between range lines. Doing so moves the strike of the rounds almost 2 (1.97”) inches at 100 meters. The table below shows at various distances what one click moves the strike of the round. Distance from target in meters 100 200 300 400 500 600 700 800 900

MCI Course 8017A

3-53

One click moves the strike… In centimeters In inches 5 2 10 4 15 6 20 8 25 10 30 12 35 14 40 16 45 18

Study Unit 3, Lesson 4

Firing Introduction

Firing the M249 SAW actually consists of three procedures: · · ·

Loading the 200-Round Ammunition Box

Loading (200-round box or 30-round magazine) Firing Zeroing

To engage targets with the M249 SAW, you must first load ammunition into the weapon. The table below lists the procedure to load the 200-round ammunition box into the M249 SAW. Step 1 2 3 4 5 6

7

Action Charge the weapon. Open the cover assembly by squeezing the cover latches. Raise the feed tray and look into the chamber to be sure that there is no round chambered. Lower the feed tray. Align the box latch with the receiver dovetail and attach the 200round ammunition box to the underside of the receiver. Place the link belt in the feed tray; making certain the open side of the links is down with the first round against the cartridge stop as shown in the picture below.

Hold the belt in position and close the cover assembly. Continued on next page

MCI Course 8017A

3-54

Study Unit 3, Lesson 4

Firing, Continued

Emergency Situations

During emergency situations, a 30-round magazine may be loaded into the M249 SAW.

Loading the 30Round Magazine

The table below lists the steps to load the 30-round magazine into the M249 SAW. Step 1

Action Insert the magazine into the magazine well on the left side of the receiver as shown in the picture below.

2

Push the magazine firmly to the right until it bottoms in the well and the magazine release tab “clicks” into the recess in the magazine. Note:

You cannot insert the magazine while a 200-round ammunition box is attached to the weapon. Continued on next page

MCI Course 8017A

3-55

Study Unit 3, Lesson 4

Firing, Continued

Using the Bipod If the automatic rifleman aims his weapon correctly and properly applies a in the Prone steady hold he can become a formidable weapon on the battlefield. The table Position below lists the steps to fire the M249 SAW with the bipod in the prone

position. Step 1

2 3 4

5

Action Assume a prone position to the rear of the weapon with the shoulder rest on your firing shoulder.

Spread your legs a comfortable distance apart with heels as close to the ground as possible. Grasp the pistol grip with your firing hand. Place your nonfiring hand on the small of the stock with your little finger touching the receiver.

Place your cheek against the forefinger of your nonfiring hand and apply a firm, steady pressure rearward and down. Continued on next page

MCI Course 8017A

3-56

Study Unit 3, Lesson 4

Firing, Continued

Aiming the M249 SAW

To aim the M249 SAW, the automatic rifleman must align the sights, focus his eye, and obtain a correct sight picture for rounds to hit target. The fundamentals to be successful on the battlefield are listed below.

Sight Alignment

Align the hooded front sight post horizontally and vertically in the center of the rear sight aperture (peep sight).

Sight Picture

While applying sight alignment, place the front sight post on the center base of the target.

Continued on next page

MCI Course 8017A

3-57

Study Unit 3, Lesson 4

Firing, Continued

Field Zeroing

To successfully engage targets, the automatic rifleman must zero the M249 SAW. The table below lists the steps to field zero the M249 SAW. Step 1

Action Center the rear sight by · ·

Rotating the windage knob until the peep sight is completely to the right. Rotating the windage knob backwards 12 clicks.

Note:

2

To check your sight, start with the sight all the way to the right. Rotate the windage knob backwards until it stops the left side. Count the clicks and divide this number by two. Rotate the elevation knob to the desired range. Note:

3 4

A 300-meter range is recommended because of the ease to determine adjustments for the center of the beaten zone. Fire a three- to five-round burst on the center of your target. To make windage changes, moving the windage knob

5

· Forward (right) to move the impact to the right. · Backward (left) to move the impact to the left. Change elevation by rotating the peep sight · ·

MCI Course 8017A

Clockwise to lower the impact. Counterclockwise to raise the impact.

3-58

Study Unit 3, Lesson 4

Malfunctions, Stoppages, and Immediate Action

Malfunctions

A malfunction occurs when the M249 SAW does not operate within the normal cycle of operation.

Stoppages

A stoppage is any interruption in the cycle of operation caused by faulty action of the M249 SAW or by faulty ammunition.

Common Types

The table below lists the most common type of stoppages, their causes, and the corrective action for each. Type Failure to feed

Causes Insufficient lubrication

Corrective Action Lubricate as required.

Insufficient gas pressure

Clean gas regulator, piston, and cylinder. Replace the ammunition.

Defective ammunition links Obstruction in receiver

Remove the obstruction.

Unlatched cover

Latch the cover.

Failure to fire

Defective ammunition

Replace with new ammunition.

Failure to chamber Failure to extract

Defective parts in the firing mechanism Carbon buildup in gas cylinder or receiver Stuck cartridge case

Inspect the parts and replace worn, burred, or broken parts. Clean gas cylinder and receiver.

Dirty chamber/bolt and slide assembly

Clean chamber, bolt, and slide assembly.

Damaged extractor spring

Notify unit maintenance.

Short recoil

Clean and lubricate bolt and slide assembly.

Failure to eject

Remove cartridge case.

Continued on next page

MCI Course 8017A

3-59

Study Unit 3, Lesson 4

Malfunctions, Stoppages, and Immediate Action, Continued

Immediate Action

Immediate action is the action you take to clear a stoppage without investigating the cause. The table below lists the steps to apply immediate action for the M249 SAW. Step 1 2

MCI Course 8017A

Action Keep the weapon pointed down range and wait 5 seconds. Charge the M249 SAW; observing for an ejected round. If the round is: · Ejected, attempt to fire. · Not ejected and the barrel is · Hot (200 rounds fired within two minutes). Wait 15 minutes and clear the weapon. · Cold. Clear the weapon and troubleshoot the cause of the malfunction.

3-60

Study Unit 3, Lesson 4

Lesson 4 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 3 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

The rear sight assembly on the M249 SAW is described as a a. b. c. d.

Item 2

When placing the link belt in the feed tray of the M249 SAW, how should you position the rounds? a. b. c. d.

Item 3

The open side of the links should be down. The open side of the links should be up. The second open round should be placed on the cartridge stop. The third open round should be placed on the cartridge stop.

During the second step in immediate action to the M249 SAW, the gunner observes for a. b. c. d.

MCI Course 8017A

semifixed, hooded post-type sight. ladder-type sight. adjustable leaf type sight. fully adjustable peep-type sight.

cause of stoppage. ejecting of links. ejecting of a round. nothing.

3-61

Study Unit 3, Lesson 4 Exercise

Lesson 4 Exercise Solutions

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer d a c

3-62

Reference Page 3-52 3-54 3-60

Study Unit 3, Lesson 4 Exercise

STUDY UNIT 4 M240G MACHINEGUN Overview

Estimated Study Time

2 hours, 20 minutes

Unit Scope

This study unit teaches you the characteristics, operation, maintenance, immediate action, care and cleaning techniques, and firing procedures for the M240G machinegun (M240G).

Learning Objectives

After completing this unit, you should be able to

In This Study Unit

·

Identify the characteristics and capabilities of the M240G.

·

Identify how to maintain the M240G.

·

Identify the steps to employing the M240G.

·

Identify how to troubleshoot malfunctions and stoppages for the M240G.

This study unit contains the following lessons: Topic Lesson 1 Lesson 2 Lesson 3 Lesson 4

MCI Course 8017A

Description Clearing and Field Stripping Cleaning, Assembling, and Inspecting Using the M240G Machinegun

4-1

See Page 4-3 4-19 4-33 4-51

Study Unit 4

(This page left intentionally blank.)

MCI Course 8017A

4-2

Study Unit 4

LESSON 1 DESCRIPTION Introduction

Estimated Study Time

30 minutes

Lesson Scope

This lesson is to teach you the basic characteristics of the M240G machinegun (M240G), the M122 tripod, and the authorized ammunition.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the role of the M240G.

·

Describe the principal characteristics of the M240G.

·

Identify the steps in the cycle of operation of the M240G.

·

Identify the types of M240G ammunition by description and use.

·

Identify the M122 tripod with accessories for the M240G.

The lesson contains the following topics: Topic Introduction Role General Characteristics and Capabilities Cycle of Operation Ammunition Mounts and Accessories Lesson 1 Exercise

MCI Course 8017A

4-3

See Page 4-3 4-4 4-5 4-7 4-9 4-10 4-16

Study Unit 4, Lesson 1

Role of the M240G Machinegun

Role

The M240G supports the infantryman in both the offense and the defense by providing a heavy volume of accurate, long-range fire beyond the capability of individual small arms.

Major Components of the M240G

This diagram and table identify the major components of the M240G.

Number 1 2 3 4 5 6 7 8

MCI Course 8017A

Name of Component Barrel group assembly Buttstock and buffer assembly Drive spring rod assembly Bolt and operating rod assembly Trigger housing assembly Cover assembly Feed tray Receiver assembly

4-4

Study Unit 4, Lesson 1

General Characteristics and Capabilities

Weight

The following table lists the weight (in pounds) of the M240G. Item Weight of machinegun Weight of tripod, M122 flex mount, and T&E (complete) Weight of spare barrel case (SL-3 complete)

Dimensions

Rifling Height of machinegun on M122 tripod

Dimension (in inches) 49 4 grooves with uniform right-hand twist (1 turn per 12 inches) 17

The following table lists the traverse limits for the M240G (with M122 tripod with traversing and elevation (T&E) mechanism). Item Elevation Depression Traverse (traversing bar)

Rates of Fire

12.9

The following table lists the dimensions (in inches) of the M240G. Item Overall length of the gun

Manipulation Limits of M122 Tripod

Weight (in pounds) 25.6 20

Limits 247 mils (18 degrees) 200 mils (11 degrees) 875 mils (49 degrees)

The following table lists the rates of fire for the M240G. Method of Delivery Cyclic Sustained Rapid

Rates of fire (in rounds per minute) 650-950 (depends on gas setting) on continuous burst 100; 6-8 round burst (4-5 seconds between bursts) 200; 10-12 round burst (2-3 seconds between bursts) Continued on next page

MCI Course 8017A

4-5

Study Unit 4, Lesson 1

General Characteristics and Capabilities, Continued

Range

The following table lists the range limits (in meters) for the M240G. Range Maximum Maximum effective (area) Maximum effective (point) Tracer burnout Grazing fire

Three Descriptive Characteristics

MCI Course 8017A

Limits (in meters) 3,725 1,800 800 Approximately 900 600

Three descriptive characteristics of the M240G are that it is ·

Belt-fed. The gun is fed by a disintegrating metallic link belt.

·

Gas-operated. The gas produced from firing one round provides the energy to mechanically prepare the weapon to fire the next.

·

Air-cooled. The barrel and receiver are exposed to permit cooling by the air.

4-6

Study Unit 4, Lesson 1

Cycle of Operation

Eight Steps

The cycle of operation for the M240G consists of eight sequential steps listed in the table below. Step Firing

Unlocking

Extracting Ejecting

Action After the bolt reaches its locked position, the operating rod moves forward, independent of the bolt. It carries the striker of the fixed firing pin through the aperture in the face of the bolt, striking and detonating the primer of the cartridge. After the cartridge ignites and the projectile passes the gas port, part of the gases enter the gas cylinder. The rapidly expanding gases enter the hollow end cap of the gas piston and force the operating assembly to the rear, providing the power for the last four steps in the cycle of functioning. The operating rod now moves rearward, independent of the bolt, for a short distance. At this point, the locking lever begins to swing toward the rear, carrying the bolt with it into its unlocked position, and clears the barrel socket. The extractor grips the rim of the cartridge as the bolt and operating rod pull the case from the chamber. As the case is withdrawn from the chamber, the ejector exerts a push from the top, and the extractor exerts a pull from the bottom. The casing falls from the gun as soon as it reaches the cartridge ejection port. At approximately the same time, the empty link is forced out of the link ejection port between the cartridge stops on the feed tray by the next round moving into the feed tray groove. Continued on next page

MCI Course 8017A

4-7

Study Unit 4, Lesson 1

Cycle of Operation, Continued

Eight Steps, continued

Step Cocking

Feeding

Chambering

Locking

MCI Course 8017A

Action This is the process of placing the parts of the gun in position to fire the next round. During the rearward independent movement of the operating rod, the firing pin striker is withdrawn from the face of the bolt. When the bolt has moved far enough to the rear to pick up the next round for chambering, cocking is completed. When the bolt is to the rear, the outer feed pawls are outside the first round of ammunition. The inner feed pawls are between the first and second rounds. As the bolt moves forward to fire the round in the feed tray groove, the belt feed pawl moves to the left. It moves up and over the second round in the belt of ammunition and is now in position to drag the second round into the feed tray groove. As the bolt moves to the rear after firing, the belt feed pawl moves to the right, dragging the second round into the feed tray groove. Inside the cover the cam roller, the feed arm with control spring, the feed arm fork, and the pivot arm are present only so the feed pawls can move back and forth, dragging rounds into position to be chambered. This is the process of stripping a round from the belt and seating it in the chamber. As the bolt travels forward, the upper locking lug of the bolt contacts the base of the cartridge. The bolt strips the round from the belt link. The chambering ramp angles downward and forces the round toward the chamber along with the spring tension of the cartridge guide pawl. The cartridge guide pawl also holds back the belt link. When the round is fully seated in the chamber, the extractor snaps over the extractor rim of the cartridge, and the ejector is depressed. During chambering, the bolt enters the barrel socket as the operating rod is driven forward by the drive spring and the locking lever, which the bolt is riding on, swings forward pushing the bolt forward and locking it to the barrel socket. Although the term locking is used here, it should be noted that in the M240G the bolt and barrel do not physically interlock. This is why the barrel can be removed even when the bolt is forward.

4-8

Study Unit 4, Lesson 1

Ammunition

Ammunition is issued in a disintegrating metallic split linked belt. The members of machinegun teams must be able to recognize the types of ammunition and their use. The table below list the ammunition for the M240G:

Types

Type and Illustration

Color of Tip Plain (No color)

Ball (M80)

· · ·

Used for Marksmanship training Anti-personnel Light material targets

Tracer (M62)

Orange

Armor-Piercing (M61)

Black

Lightly armored targets

Blank (M82)

No bullet (metal case with no projectile)

Simulated firing

Dummy (M63)

No color; fluted cartridge case

MCI Course 8017A

4-9

· · · ·

· ·

Observing fire Incendiary effect Signaling Marking targets

Gun drills Training (completely inert)

Study Unit 4, Lesson 1

Mount and Accessories

Bipod

The bipod mount is part of the receiver group. The bipod yoke fits around the receiver. The forward grip assembly holds the bipod yoke in position. To lower the bipod legs, push in on the leg support lock and rotate the legs down and forward as shown in the diagram below. Note: The legs will automatically lock in the down position.

M122 Tripod

The M122 tripod mount consists of the tripod assembly as shown in the diagram below. The M122 provides a stable firing base for the M240G.

Continued on next page

MCI Course 8017A

4-10

Study Unit 4, Lesson 1

Mount and Accessories, Continued Traversing Bar

The diagram below shows how the traversing bar connects the two rear legs and supports the traversing and elevation (T&E) mechanism. The traversing bar has a mil scale engraved on it to help the gunner adjust the gun. Engraved on the bar is a scale that measures direction in mils. It is graduated in 5-mil increments and is numbered every 100 mils.

Traversing and Elevating (T&E) Mechanism

The T&E mechanism shown in the diagram below provides controlled manipulation and ability to engage predetermined targets.

Adjusting the T&E ·

Traversing Handwheel: Each click of the handwheel indicates a 1 mil change in direction. The total traverse on the screw is 100 mils.

·

Elevating Handwheel: Each click on the handwheel indicates a 1 mil change in elevation. The total change in elevation is plus or minus 200 mils. Continued on next page

MCI Course 8017A

4-11

Study Unit 4, Lesson 1

Mount and Accessories, Continued

Flex Mount Assembly

The flex mount joins the gun and T&E to the tripod to enhances the stability and dampens the recoil of the weapon as shown in the diagram below.

Continued on next page

MCI Course 8017A

4-12

Study Unit 4, Lesson 1

Mount and Accessories, Continued

Mounting the M240G

The preferred method is to mount the flex mount assembly first to the tripod and then mount the machine gun. The table below lists the steps to mount the M240G. Step Action 1 Lock the M122 tripod’s legs open. 2 Center the T&E before mounting. Do the following. On the · Elevating handwheel, turn until approximately two fingers are visible on upper elevating screw. · Traversing slide, rotate until approximately two fingers are visible on lower elevating screw. · Traversing handwheel, turn until the offset head is centered on the traversing screw.

Continued on next page

MCI Course 8017A

4-13

Study Unit 4, Lesson 1

Mount and Accessories, Continued

Mounting the M240G, continued

Step 3

4

Action Mount the flex mount assembly on the tripod. ·

Place the pintle assembly of flex mount assembly into the sleeve bushing of the tripod.

·

Engage the pintle locking lever to hold the pintle assembly in place.

Mount the T&E mechanism. · ·

Lower the traversing slide over the traversing bar. Turn the locking lever to secure the traverse slide in place.

Note: See diagram above. Continued on next page

MCI Course 8017A

4-14

Study Unit 4, Lesson 1

Mount and Accessories, Continued

Mounting the M240G, continued

Step 5

MCI Course 8017A

Action Attach the gun to the flex mount by ·

Aligning the mounting hole

·

Inserting the retaining pin, thereby locking the weapon in place as shown in the diagram below

4-15

Study Unit 4, Lesson 1

Lesson 1 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 6 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

The role of the M240G is to provide a a. medium volume of accurate, long-range fire equal to the capability of individual small arms. b. heavy volume of accurate, long-range fire beyond the capability of individual small arms. c. light volume of long-range fire beyond the capability of individual small arms. d. heavy volume of accurate, short-range fire equal to the capability of individual small arms.

Item 2

Which of the following is the maximum effective range in meters of the M240G? a. b. c. d.

Item 3

11,000 3,725 1,800 600

What are the three principal characteristics of the M240G? a. b. c. d.

Magazine-fed, air-cooled, gas-operated Belt-fed, air-cooled, gas-operated Belt-fed, water-cooled, recoil-operated Magazine-fed, air-cooled, blowback-operated Continued on next page

MCI Course 8017A

4-16

Study Unit 4, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Item 4

Correctly complete the steps of the cycle of operation of the M240G: Feeding, chambering, locking, firing, a. b. c. d.

Item 5

Ammunition with black painted tips is used for what type of targets? a. b. c. d.

Item 6

Anti personnel Lightly armored targets Signaling Lightly material targets

The traversing bar connects to the a. b. c. d.

MCI Course 8017A

extracting, unlocking, ejecting, and cocking. unlocking, ejecting, extracting, and cocking. extracting, ejecting, unlocking, and cocking. unlocking, extracting, ejecting, and cocking.

traversing and elevating mechanism. front leg. two rear legs. bipod yolk.

4-17

Study Unit 4, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6

MCI Course 8017A

Answer b c b d b c

4-18

Reference Page 4-4 4-6 4-6 4-7 4-9 4-11

Study Unit 4, Lesson 1 Exercise

LESSON 2 CLEARING AND FIELD STRIPPING Introduction

Estimated Study Time

20 minutes

Lesson Scope

The purpose of this lesson is to teach you how to clear and fieldstrip the M240G.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the steps to clear the M240G.

·

Identify the steps to fieldstrip the M240G.

This lesson contains the following topics Topic Introduction Clearing Field Stripping Lesson 2 Exercise

MCI Course 8017A

4-19

See Page 4-19 4-20 4-23 4-30

Study Unit 4, Lesson 2

Clearing

Procedure

Before you begin disassembling the M240G, you must clear the weapon to be sure it is safe. The following table lists the steps to clear the M240G. Step 1 2

3

Action Point the weapon down range or in a safe direction. Attempt to move the safety to the F position as shown in the picture below.

Pull the cocking handle to the rear until the bolt locks as shown in the picture below.

Continued on next page

MCI Course 8017A

4-20

Study Unit 4, Lesson 2

Clearing, Continued

Procedure, continued

Step 4

Action Return the cocking handle forward and move the safety to the S position as shown in the pictures below.

5

Push in the latches to open the cover assembly as shown in the picture below.

Continued on next page

MCI Course 8017A

4-21

Study Unit 4, Lesson 2

Clearing, Continued

Procedure, continued

Step 6

7

Action Raise the feed tray and visually inspect the chamber as shown in the picture below.

If the chamber is clear · · ·

8

MCI Course 8017A

Place the safety on the fire position (F). Pull the cocking handle to the rear (palm up). Ease the bolt forward by pulling the trigger.

Note: Ease the bolt forward to prevent damage to the bolt and barrel. Close cover assembly.

4-22

Study Unit 4, Lesson 2

Field Stripping

Field Stripping

After you have cleared the weapon, you can begin to field strip the machinegun into its five major groups as follows: · · · · ·

Removing the Barrel

Barrel Trigger housing group Buttstock Receiver group Operating group

The following table lists the steps for removing the barrel. Step 1

2 3

Action Depress and hold the barrel locking latch as shown in the picture below.

Simultaneously rotate the barrel carrying handle assembly. Remove the barrel by pulling it straight out as shown in the picture below.

Continued on next page

MCI Course 8017A

4-23

Study Unit 4, Lesson 2

Field Stripping, Continued

Removing the Trigger Housing Group

The following table lists the steps to remove the trigger housing group.

Step 1

Action Depress the spring pin as shown in the picture below.

2

Remove the spring pin as shown in the picture below.

3

Pull the trigger housing group back and down as shown in the picture below.

Continued on next page MCI Course 8017A

4-24

Study Unit 4, Lesson 2

Field Stripping, Continued

Removing the Buttstock

The following table lists the steps to remove the buttstock. Step 1

2

Action Completely depress the buttstock release latch as shown in the picture below.

Lift the buttstock while holding the receiver with your free hand as shown in the picture below.

Continued on next page

MCI Course 8017A

4-25

Study Unit 4, Lesson 2

Field Stripping, Continued

Removing Receiver Group

The following table lists the steps to remove the drive spring. Step 1

Action Push the drive spring up and back as shown in the picture below.

2

Lift the operating rod out of the receiver as shown in the picture below.

Continued on next page

MCI Course 8017A

4-26

Study Unit 4, Lesson 2

Field Stripping, Continued

Removing Receiver Group, continued

Step 3

Action Depress the cover latches and raise the cover assembly as shown in the picture below.

4

Pull the cocking handle to the rear as shown in the picture below.

5

Slide the bolt and operating assembly to the rear and remove them as shown in picture below.

Continued on next page

MCI Course 8017A

4-27

Study Unit 4, Lesson 2

Field Stripping, Continued

Removing Receiver Group, continued

Step 6

7

Action Close the cover and push the spring pin out with the back of the buffer and remove it as shown in the picture below.

Depress the cover latch and remove the cover assembly and the feed tray assembly as shown in the picture below.

Continued on next page

MCI Course 8017A

4-28

Study Unit 4, Lesson 2

Field Stripping, Continued

Gas System

MCI Course 8017A

Rotate clockwise and remove the collar and the gas regulator assembly from the gas plug. Slide the gas plug to the rear as shown in the picture below.

4-29

Study Unit 4, Lesson 2

Lesson 2 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 6 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

What is the first step in clearing the M240G? a. b. c. d.

Items 2 Through 6

MCI Course 8017A

Raise the cover by pressing the cover latch. Visually inspect the chamber. Raise the feedtray. Point the gun down range or in a safe direction.

Matching: In the space provided, place the letter of the step for field stripping from column 2 in the correct sequence in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Correct Sequence

Steps for Field Stripping

___ 2. ___ 3. ___ 4. ___ 5. ___ 6.

a. b. c. d.

Remove the receiver group. Remove the barrel. Remove the buttstock. Remove the trigger housing group. e. Remove the operating group.

4-30

Study Unit 4, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6

MCI Course 8017A

Answer d b d c a e

4-31

Reference Page 4-20 4-23 4-24 4-25 4-25 4-27

Study Unit 4, Lesson 2 Exercise

(This page intentionally left blank.)

MCI Course 8017A

4-32

Study Unit 4, Lesson 2 Exercise

LESSON 3 CLEANING, ASSEMBLING, AND INSPECTING Introduction

Estimated Study Time

25 minutes

Lesson Scope

The purpose of this lesson is to teach you the basics in cleaning, maintaining, assembling, and inspecting the M240G machinegun (M240G).

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the function and type of cleaning and lubricating material for the M240G.

·

Identify the maintenance procedures for the M240G.

·

Identify the steps for assembling the M240G.

·

Identify the steps for inspecting the M240G.

This lesson contains the following topics: Topic Introduction Cleaning Maintaining Assembling Inspecting Spare Barrel Case Lesson 3 Exercise

MCI Course 8017A

4-33

See Page 4-33 4-34 4-35 4-39 4-44 4-46 4-47

Study Unit 4, Lesson 3

Cleaning

Purpose

Proper care and cleaning prevents damage to the weapon and ensures its proper functioning during firing. CAUTION:

Cleaning Materials

Unauthorized maintenance can damage a weapon, sometimes beyond repair.

The table below lists the types of cleaning and lubricating materials that you will need to clean the M240G. Type Cleaner-lubricantpreservative (CLP)

Function Preferred lubricant to lubricate operating parts before, during, and after firing.

Rifle bore cleaner (RBC)

Note: This lubricant is an authorized cleaner. Use to clean the bore, chamber and powderfouled parts. Notes: This lubricant is an authorized cleaner. Do not mix lubricants on the same weapon. Cleans carbon from metal parts.

Dry cleaning solvent

You must lubricate the weapon after using dry cleaning solvent. Lubricates under cold weather conditions. Note:

Lubricant, arctic weather (LAW) Weapon lubricating oil, semi-fluid with Teflon (LSA-T)

MCI Course 8017A

Lubricates under extremely cold weather conditions.

4-34

Study Unit 4, Lesson 3

Maintaining

Before Firing

The following table lists the maintenance steps to take before firing the M240G. Step 1 2 3

4

During Firing

Action Inspect the weapon for proper cleanliness, mechanical condition and missing or broken parts. Remove excess oil from the bore, chamber, barrel socket, and the face of the bolt. Check headspace of the barrel by counting the number of clicks when rotating the barrel lock. Note: A minimum of two clicks, but not more then seven, should be heard. Place a light coat of CLP on the ·

Operating rod. Lubricate the recesses along the sides that make contact with the receiver rails.

·

Bolt. Place a very small amount of CLP on the upper and lower locking lugs, the cam roller, and in the bolt camming slot.

·

Receiver. Pull the bolt to the rear and place a line of CLP on either side of the bolt. Pull the bolt back and forth to spread the CLP over the bolt and receiver rails.

During firing, maintain a light coat of CLP on the operating rod, bolt, and receiver. While firing, be sure the connections of the gas system remain tight. Change barrels when necessary. Continued on next page

MCI Course 8017A

4-35

Study Unit 4, Lesson 3

Maintaining, Continued

Reasons to Change Barrels

Change barrels periodically during firing. Use one barrel while the other is cooling. Changing barrels · ·

When to Change the Barrel

Increases the life of each barrel. Ensures a continuous rate of accurate fire.

Change the barrel if · · · ·

You fire the sustained rate of fire for 10 minutes (1,000 rounds in 10 minutes). You fire the rapid rate of fire for 2 minutes (400 rounds in 2 minutes). The barrel becomes so hot that handling it is difficult. You have fired a long burst of continuous fire.

Note: The barrel can be changed with the bolt forward or to the rear. After Firing

The following table lists the maintenance steps to take after firing the M240G. Step 1 2 3 4

Action Clean the weapon with CLP, RBC, or dry cleaning solvent. Clean the weapon for three consecutive days after firing to remove all carbon deposits. After the cleaning each day, wipe off all cleaning materials and place a light coat of CLP on all metal parts. Clean nonmetallic portions of the gun with hot water, rags and nonabrasive brush. Continued on next page

MCI Course 8017A

4-36

Study Unit 4, Lesson 3

Maintaining, Continued

General Maintenance Notes

If the weapon is fired daily, repeated detailed disassembly will cause unnecessary wear. You can perform adequate cleaning on a weapon that has been disassembled into the five main groups. Clean the M122 tripod and T & E mechanism on the same three consecutive days cleaning cycle as the machinegun. CAUTION:

Normal Maintenance

Do not use cleaning materials on the rubber parts of the weapon. Do not submerge the buffer in any cleaning fluid.

Inspect the weapon daily for rust. Maintain a light coat of CLP on all metal parts except · · ·

The gas piston Inside of the gas cylinder The buffer Continued on next page

MCI Course 8017A

4-37

Study Unit 4, Lesson 3

Maintaining, Continued

Extreme Environments

In extreme environments, you must take extra precautions for the trouble-free operation of your M240G. The following table shows the precautions you must take in these conditions. Environment Cold climates

Precautions · Keep the weapon free of excess lubricants, cleaners, and moisture. All of these can freeze and cause the weapon to operate sluggishly. · Use LAW in sustained temperatures of 0o Fahrenheit or below.

· If you bring the weapon indoors, let it come to room temperature, wipe it completely dry, and lubricate with a light coat of CLP. Hot, humid climates · Inspect more frequently for rust and keep the weapon as free from moisture as possible.

Hot, dry climates

· Lubricate the weapon properly with CLP. Generally, a heavier application than normal is required. · Keep sand and dust from collecting in the working parts of the weapon. · Clean the weapon daily with CLP, then wipe dry. The Teflon coating left by the CLP will be sufficient for the weapon to operate properly. · Cover the weapon when not in use.

MCI Course 8017A

4-38

Study Unit 4, Lesson 3

Assembling

Sequence

The sequence for assembling the M240G is the reverse order of fieldstripping. · · · · ·

Assembling the Operating Group

Assemble and replace the operating group Replace the receiver group Replace the buttstock Replace the trigger housing group Replace the barrel

The following table lists the steps to assemble and insert the operating group.

Step 1

2

Action Insert the bolt and operating group into the receiver, aligning the slots with the rails inside the receiver as shown in the figure below.

Extend the bolt forward and then push the entire bolt and operating rod assembly inside the receiver. Continued on next page

MCI Course 8017A

4-39

Study Unit 4, Lesson 3

Assembling, Continued

Assembling the Operating Group, continued

Step 3 4

Replacing the Buttstock

Action Insert the drive spring rod into the receiver. Press in and down until the spring rod is seated against the retaining studs inside the receiver as shown in the figure below.

The following table lists the steps to replace the buttstock. Step 1 2

Action Depress the buttstock release latch. Align the recessed grooves at the front of the buttstock with the vertical rails at the rear of the receiver and slide down until it locks in place as shown in the figure below.

Continued on next page

MCI Course 8017A

4-40

Study Unit 4, Lesson 3

Assembling, Continued

Replacing the Trigger Housing Group

The following table lists the steps to replace the trigger housing group.

Step 1

Action Insert the holding notch on the front of the trigger housing into the recess on the bottom of the receiver.

2

Insert the trigger housing group in and up as shown in the figure below.

3

Replace the spring pin. Continued on next page

MCI Course 8017A

4-41

Study Unit 4, Lesson 3

Assembling, Continued

Replace the Barrel

The following table lists the steps to replace the barrel. Step 1 2

Action Insert the gas plug into the gas regulator. Place and rotate the collar over the forward end of the plug and lock in place.

3 4

Depress and hold the barrel locking latch. Insert the barrel with the handle in the upright position as shown in the figure below.

5

Rotate the barrel to the right until is locks. Note: There must be a minimum of two clicks, but mot more then seven. Continued on next page

MCI Course 8017A

4-42

Study Unit 4, Lesson 3

Assembling, Continued

Replace Feed The following table lists the steps to replace the feed tray and cover assembly. Tray and Cover

Step

MCI Course 8017A

Action

1

Align the feed tray guides with receiver brackets.

2

Place the cover over mounting bracket on receiver and push down into closed position as shown in the picture below.

4-43

Study Unit 4, Lesson 3

Inspecting

Guidelines

General guidelines for inspecting the M240G are to · · · · ·

Sequence

Always check for cleanliness Look for broken, missing, or burred parts Test springs for serviceability Perform a function check to determine if the weapon is functioning properly Inspect the M240G in an orderly sequence to be sure that no part is overlooked and time isn't wasted

The following table lists the suggested sequence for inspecting the M240G. Step 1

2

Action Inspect the cover: · Pull the feed cam back and forth to be sure that the belt feed pawl moves properly. · Carefully check parts and components for serviceability and proper function. Inspect the safety and proper assembly by performing a function check as described in the table below. Step 1 2 3 4

3 4 5 6

Action Put the safety on F. Pull and ensure the bolt locks to the rear. Return the safety to S and attempt to fire. Put the safety on F and pull the trigger riding bolt home.

Note: If the bolt did not remain to the rear, the sear shoulder or sear notch is worn. Inspect the forward portion of the receiver rails and the face of the bolt. Inspect the barrel socket, chamber, and bore for cracks. Inspect the bipod assembly by lowering and raising the legs. Inspect the sights. Continued on next page

MCI Course 8017A

4-44

Study Unit 4, Lesson 3

Inspecting, Continued

Sequence, continued

Step 7

Action Inspect the mount. Be sure the · · ·

8 9 10

MCI Course 8017A

Pintle is attached properly Tripod is fully extended T&E mechanism is positioned correctly so the scales on the T&E can be read without difficulty Grasp the stock and gently pull the weapon back and forth to test for inordinate play in the M122 tripod. Determine if the slide lock lever firmly holds the T&E to the traversing bar. Examine the spare barrel.

4-45

Study Unit 4, Lesson 3

Spare Barrel Case

Components

MCI Course 8017A

The spare barrel case should contain each of the following as shown in the figure below.

4-46

Study Unit 4, Lesson 3

Lesson 3 Exercise

Estimated Study Time

10 minutes

Directions

Complete exercise items 1 through 8 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

Which is an authorized cleaner for the M240G after live fire exercise? a. b. c. d.

Item 2

Dry cleaning solvent CLP LSA-T LAW

The barrel of the M240G should be changed if you fire the sustained rate of fire for a. b. c. d.

40 minutes (4,000 rounds). 30 minutes (3,000 rounds). 20 minutes (2,000 rounds). 10 minutes (1,000 rounds). Continued on next page

MCI Course 8017A

4-47

Study Unit 4, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Items 3 Through 7

Item 8

Matching: In the space provided, place the letter of the step for assembling from column 2 in the correct sequence in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Correct Sequence

Steps for Assembling

___ 3. ___ 4. ___ 5. ___ 6. ___ 7.

a. b. c. d.

What is a guideline for inspecting M240G? a. b. c. d.

MCI Course 8017A

Replace the receiver group. Replace the barrel. Replace the buttstock. Replace the trigger housing group. e. Assemble and replace the operating group.

Springs should be serviceable. Bolt should be to the rear. Safety should be on F. T&E mechanism should be turned clockwise until fully seated.

4-48

Study Unit 4, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8

MCI Course 8017A

Answer b d e a c d b a

4-49

Reference Page 4-34 4-36 4-39 4-39 4-40 4-41 4-42 4-44

Study Unit 4, Lesson 3 Exercise

(This page intentionally left blank.)

MCI Course 8017A

4-50

Study Unit 4, Lesson 3 Exercise

LESSON 4 USING THE M240G MACHINEGUN Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson teaches you about the employment of the M240G machinegun (M240G). It will cover the basics of sighting, firing, malfunctions, stoppages, and immediate action for the M240G.

Learning Objectives

After completing this lesson, you should be able to ·

Identify the major components for correct sight alignment of the M240G.

·

Identify the steps used to load the M240G.

·

Identify the steps used to clear the M240G.

·

Identify the steps to field zero the M240G.

·

Identify the steps to change barrels for the M240G.

·

Match stoppages and malfunctions to their usual causes.

·

Identify the steps to conduct immediate action (IA). Continued on next page

MCI Course 8017A

4-51

Study Unit 4, Lesson 4

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction Sighting Loading Clearing/Unloading Field Zeroing Changing Barrels Malfunctions, Stoppages, and Immediate Action Remedial Action Lesson 4 Exercise

MCI Course 8017A

4-52

See Page 4-51 4-53 4-55 4-57 4-58 4-59 4-60 4-62 4-64

Study Unit 4, Lesson 4

Sighting

Components

Sighting the M240G machinegun consists of · · ·

Front Sight

The front sight on the barrel is adjustable for elevation and windage and can be individually zeroed to the machine gun with the combination front sight adjusting tool. · ·

Rear Sight

Adjusting the sights Obtaining proper sight alignment Obtaining proper sight picture

Adjusting elevation. Rotating the front sight post counterclockwise brings the point of impact down on the target. Adjusting windage. Moving the front sight post to the right moves the strike of the round to the left on the target.

The rear sight consists of a peep sight aperture on an adjustable leaf slide. The rear sight can be used horizontally or vertically depending on range. · ·

The horizontal position is used to ranges of up to 800 meters. The vertical position is used to engage targets from 800 meter to 1,800 meters.

Note: The range plate is marked at 100 meter intervals from 200 meters to 1,800 meters. Continued on next page

MCI Course 8017A

4-53

Study Unit 4, Lesson 4

Sighting, Continued

Sight Alignment

The sights are aligned when the front and the rear sights are in a line, one in front of the other. To correctly align the sights of the M240G, center the top of the front sight blade in the aperture of the rear sight as shown in the figure below.

Sight Picture

While maintaining proper sight alignment, align the top edge of the front sight with the center base of the target to get proper sight picture. This correct sight picture is commonly referred to as center mass.

MCI Course 8017A

4-54

Study Unit 4, Lesson 4

Loading

With a Raised Cover

You can load the M240G with the cover raised or closed. The following table lists the steps to load the M240G with a raised cover. Step 1 2 3 4

Action Be sure the bolt is forward and the safety is on F. Open the ammunition box by tearing off the tab marked with the silhouette of a round. Attach the bandoleer to the bandoleer hanger by slipping the loop on the end of the bandoleer over the hanger. Locate the end of the ammunition belt and pull out the first few rounds. Note:

5 6

Be sure the rounds are coming out of the box with the tips pointed towards the muzzle and the solid part of the links facing up. Place the first round in the feed tray groove. Be sure the retainer pawls have engaged the belt firmly between two rounds. Close the cover and be sure it firmly latches without having to beat on it or force it closed. The gun is now fully loaded. Continued on next page

MCI Course 8017A

4-55

Study Unit 4, Lesson 4

Loading, Continued

With a Closed Cover

The following table lists the steps to load the M240G with a closed cover. Step 1 2 3 4

5 6

Action Be sure the bolt is forward and the safety is on F. Open the ammunition box by tearing off the tab marked with the silhouette of a round. Attach the bandoleer to the bandoleer hanger by slipping the loop on the end of the bandoleer over the hanger. Locate the end of the ammunition belt and pull out the first few rounds. Note: Be sure the rounds are coming out of the box with the tips pointed towards the muzzle and the solid part of the facing up. Force the first round into the feedway until you hear a distinct click. Pull the cocking handle to the rear and return the handle forward. The gun is now fully loaded. Note: If the weapon will not be fired immediately, place the weapon of safe (S).

MCI Course 8017A

4-56

Study Unit 4, Lesson 4

Clearing/Unloading

Procedure

The following table lists the steps to clear the M240G. Step 1 2 3 4

Action Pull the bolt to the rear and place the safety on S. Press the cover latches and raise the cover. Clear the feed tray of ammunition and links. Lift the feed tray and visually inspect the chamber to be sure the gun is clear.

WARNING:

MCI Course 8017A

If you suspect there is a round in a hot chamber, do not raise the cover. If the round cooks off with the cover raised, metal fragments can injure you.

4-57

Study Unit 4, Lesson 4

Field Zeroing

Procedure

You can zero the M240G by the 12.7-meter or the field method. The preferred method is field zeroing. The 12.7-meter method is used to prepare crews for qualification fire. The following table lists the steps to field zero the M240G. Step 1 2 3 4

Action Select a clearly definable target at a known range between 300 to 700 meters. Set the rear sight slide to the correct range setting. With the T&E mechanism centered, lay the gun on the target and obtain a good sight picture. Fire a three-round burst and freeze. Calculate the mean center of impact. If… The center of impact is on target The center of impact is not on target

Then… Battlesight zero (BZO) is complete. Adjust the front sight post.

Adjusting the front sight At 200 meters… Moving the front sight up or Moves the point of impact up or down approximately 4 1/4 down half a turn inches Moving the front sight left or Moves the point of impact left or right approximately 3 1/8 right half a turn inches 5

Fire another three-round burst to confirm zero. Note

If the mean point of impact is centered on the target, zeroing is complete. If not repeat steps 2-4.

Note: To find out how to use the 12.7-meter zeroing method, refer to MCWP 3-15.1, Machineguns and Machinegun Gunnery, pages 3-60 to 3-62.

MCI Course 8017A

4-58

Study Unit 4, Lesson 4

Changing Barrels

Mounted on a Tripod

Changing the barrel takes only a few seconds and the weapon does not have to be cleared to perform the actions listed in the table below. Note: Refer to study unit 4, lesson 3 to review when to change the barrel. Step 1 2 3

4 5 6 7 8 9

MCI Course 8017A

Action Stop firing. Place the weapon on safe (S). Note: If bolt is forward, the weapon will not go on safe. Be sure the gun is locked in position by the T&E mechanism. Note: If the gun is mounted on bipod, lock buttstock into your right shoulder. Reach forward and release the barrel lock. Put on a heat protective glove. Remove the hot barrel, setting its rear on the spare barrel case or on some other object to keep it out of the dirt. Grasp spare barrel by changing handle. Insert the barrel into barrel socket on receiver. Lock the barrel into the receiver with the barrel lock and continue the mission.

4-59

Study Unit 4, Lesson 4

Malfunctions, Stoppages, and Immediate Action

Malfunctions

A malfunction is any failure of the gun to function satisfactorily. The two most common malfunctions of the M240G are · ·

Sluggish operation Runaway gun

Note: Defective ammunition or improper operation of the gun by a crew member is not considered a malfunction. Sluggish Operation

Sluggish operation is a malfunction caused by ·

Excessive friction. Friction is caused by lack of lubrication or excessive dirt or carbon in the gas system or on the bolt and receiver rails.

·

The loss of gas in the gas system. The loss of gas is caused by loose connections in the gas system or a missing gas port plug.

To reduce sluggish operation, move the regulator setting to number 2 or 3 position. To correct sluggish operation, clean, lubricate, tighten, or replace parts as required. Runaway Gun

Runaway gun is a malfunction that occurs when the gun continues to fire after you release the trigger. A runaway gun is usually caused by a worn, broken, or burred sear. To stop a runaway gun · ·

Twist and break the belt of ammunition Expend all remaining rounds

The remedy for a runaway gun is to replace worn parts. Continued on next page

MCI Course 8017A

4-60

Study Unit 4, Lesson 4

Malfunctions, Stoppages, and Immediate Action, Continued

Stoppages

A stoppage is any interruption in the cycle of functioning caused by the faulty action of the gun or defective ammunition. Some common examples are · ·

Failure to feed Failure to fire

Note: Stoppages must be cleared quickly and firing must be resumed. Immediate Action

To maintain a continuous rate of fire, you must quickly and efficiently clear any stoppages that occur. The table below lists the steps to perform immediate action. Step 1 2

Action Wait 5 Seconds for a possible hangfire. Within the next five seconds, pull the bolt to the rear and see if ejecting takes place. If… Brass is ejected Brass is not ejected

Then… Attempt to fire. Place the weapon on safe (S) and continue with step 3.

Note:

3 4

MCI Course 8017A

If you cannot pull the bolt to the rear, assume that a live round is in the chamber. Place the safety on S. Wait until the barrel reaches air temperature (Cold barrel). Raise the cover, unload, and clear the gun. If the barrel is cold (fired less than 150 rounds during the last 2 minutes) clear the machinegun, reload and attempt to fire. If barrel is hot (fired 150 rounds or more during the last 2 minutes) wait 15 minutes and clear the machinegun.

4-61

Study Unit 4, Lesson 4

Remedial Action

Definition

When immediate action fails to reduce the stoppage, conduct an investigation into the cause of the problem.

Common Causes of Stoppages

Two common causes of a stoppage that requires remedial action are

Stuck Cartridge

A stuck cartridge can result from the swelling of a cartridge that keeps the extractor from extracting the round from the chamber. The table below lists the steps to clear a stuck cartridge:

· ·

Stuck cartridge Ruptured cartridge

Step 1 2 3 4

5

Action Lock bolt to the rear. Place the weapon on safe (S). Allow the barrel to cool for 15 minutes. Connect a cleaning rod and insert it into the muzzle end.

Push the round out through chamber end. Continued on next page

MCI Course 8017A

4-62

Study Unit 4, Lesson 4

Remedial Action, Continued

Ruptured Cartridge Case

The extractor sometimes tears the base of the cartridge off as the bolt moves to the rear, leaving the cartridge wedged inside the chamber. The table below list the steps to clear this stoppage. Step 1 2

3

MCI Course 8017A

Action Remove the barrel from the receiver. Insert the extractor into the chamber where it can grip the cartridge.

Pull the extractor and remove the remains of the cartridge.

4-63

Study Unit 4, Lesson 4

Lesson 4 Exercise

Estimated Study Time

10 minutes

Directions

Complete exercise items 1 through 7 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

What does the figure below represent?

a. b. c. d. Item 2

While loading the M240G with the cover raised, where do you place the first round? a. b. c. d.

Item 3

Correct sight Alignment Correct sight Picture Correct aiming Correct sight Aperture

In the chamber In the feed tray groove Directly over the belt-holding pawl Just to the left of the belt-feeding pawl

To clear the M240G, you must pull the bolt to the rear, place the weapon on safe, raise the cover, clear the feed tray, and a. b. c. d.

twist and bread the belt of ammunition. visually inspect the chamber. wait until the barrel cools to air temperature. expend all remaining rounds down range. Continued on next page

MCI Course 8017A

4-64

Study Unit 4, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Item 4

What is the proper setting for the T&E mechanism when field zeroing? a. b. c. d.

Item 5

The T&E mechanism needs to be ________ when changing M20G barrels. a. b. c. d.

Item 6

excessive friction and loss of gas in the gas system. defective ammunition and improper operation. failure to feed and defective belt. sluggish operation and runaway gun.

You are a machinegun team leader. While firing on the range, your gun has a stoppage. What is the first thing that your gunner should do? a. b. c. d. e.

MCI Course 8017A

locked centered level open

The most common malfunctions of the M240G are a. b. c. d.

Item 7

Slid to the far left of the traversing bar As close to being centered as possible Slid to the far right of the traversing bar Right 200

Wait five seconds for a hangfire. Observe the ejection port while pulling the bolt to the rear. Wait until the barrel cools to air temperature. Perform subsequent action. Lubricate the weapon and inspect all parts.

4-65

Study Unit 4, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7

MCI Course 8017A

Answer a b b b a d a

4-66

Reference Page 4-54 4-55 4-57 4-58 4-59 4-60 4-61

Study Unit 4, Lesson 4 Exercise

STUDY UNIT 5 M2HB .50-CALIBER MACHINEGUN Overview

Estimated Study Time

2 hours, 15 minutes

Unit Scope

This study unit is designed to give you the characteristics, operation, maintenance, immediate action, care and cleaning techniques, and firing procedures for the M2HB .50-caliber machinegun.

Learning Objectives

After completing this unit, you should be able to

In This Study Unit

·

Identify the characteristics and capabilities of the M2HB .50-caliber machinegun.

·

Identify how to maintain the M2HB .50-caliber machinegun.

·

Identify the steps to employing the M2HB .50-caliber machinegun.

·

Identify how to troubleshoot malfunctions and stoppages for the M2HB .50-caliber machinegun.

This study unit contains the following lessons: Topic Lesson 1 Lesson 2 Lesson 3 Lesson 4

MCI Course 8017A

Description Clearing, Disassembling, Cleaning, and Inspecting Assembling and Conducting the Function Check Sighting, Firing, and Conducting Immediate Action

5-1

See Page 5-3 5-19 5-35 5-51

Study Unit 5

(This page intentionally left blank.)

MCI Course 8017A

5-2

Study Unit 5

LESSON 1 DESCRIPTION Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson discusses the basic characteristics of the M2HB .50-caliber machinegun and the ammunition it uses.

Learning Objectives

After completing this lesson, you should be able to ·

Identify the capabilities of the M2HB .50-caliber machinegun.

·

Describe the principal characteristics of the M2HB .50-caliber machinegun.

·

Identify the different types of mounts and accessories for the M2HB .50caliber machinegun.

·

Identify the standard types of ammunition for the M2HB .50-caliber machinegun based on color and use.

·

Identify the steps in the cycle of operation for the M2HB .50-caliber machinegun. Continued on next page

MCI Course 8017A

5-3

Study Unit 5, Lesson 1

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction Role and Capabilities General Characteristics Mounts and Accessories Ammunition Cycle of Operation Lesson 1 Exercise

MCI Course 8017A

5-4

See Page 5-3 5-5 5-6 5-10 5-13 5-14 5-16

Study Unit 5, Lesson 1

Role and Capabilities

Role

The M2HB .50-caliber machinegun supports the infantryman in both the offense and the defense by providing a heavy volume of accurate, long-range fire.

Five Capabilities

The five capabilities of the M2HB .50-caliber machinegun are to

MCI Course 8017A

·

Support the infantryman in the offense and the defense

·

Provide ·

A heavy volume of close, accurate, and continuous fire when in an attack

·

Long range, close defensive, and final protective fires as part of a unit’s defensive lines

·

Reconnaissance by fire on suspected enemy positions

·

Protect motorized movements

·

Defend against low-flying, hostile aircraft

·

Destroy lightly armored vehicles

5-5

Study Unit 5, Lesson 1

General Characteristics

M2HB .50caliber Machinegun

The operator must understand the characteristics of the .50-caliber machinegun to have success on the battlefield The picture below shows the Browning M2HB .50-caliber machinegun on an M3 tripod mount.

Continued on next page

MCI Course 8017A

5-6

Study Unit 5, Lesson 1

General Characteristics, Continued

Major Components

The M2HB .50-caliber machinegun can be broken down into eight major components pictured below.

Continued on next page

MCI Course 8017A

5-7

Study Unit 5, Lesson 1

General Characteristics, Continued

Weight

The following table lists the weight of the major parts of the M2HB .50caliber machinegun. Component Part Receiver group Barrel M3 tripod mount Total weight

Length

Weight (in pounds) 60 Approximately 24 44 Approximately 128

The following table lists the length of the M2HB .50-caliber machinegun. Item Length of barrel Length of gun, overall

Range

Length (in inches) 45 Approximately 65

The following table lists the range of the M2HB .50-caliber machinegun. Type of Range Maximum Maximum Effective Grazing fire

Range (in meters) 6,767 1,830 700 Continued on next page

MCI Course 8017A

5-8

Study Unit 5, Lesson 1

General Characteristics, Continued

Rates of Fire

The following table lists the rates of fire of the M2HB .50-caliber machinegun. Type of Fire Sustained Rapid Cyclic

Rate (rounds per minute) Less the 40 More than 40 400-550

Muzzle Velocity The muzzle velocity of the M2HB .50-caliber machinegun is 3,050 feet per

second. Descriptive Characteristics

MCI Course 8017A

The M2HB .50-caliber machinegun is ·

Belt-fed. By repositioning some of its component parts, the gun is capable of alternate feed (ammunition can be fed from either the right or left sides). The infantry generally uses left side feed. A disintegrating metallic link belt is used for feeding.

·

Air-cooled. The maximum surface of the barrel and receiver is exposed to permit air-cooling. Perforations in the barrel support allow air to circulate around the breech end of the barrel and help in cooling the parts. The heavy barrel is used to delay early overheating.

·

Recoil-operated. The expanding powder gases (which various springs, cams, and levers control) provide the force for recoil operation.

5-9

Study Unit 5, Lesson 1

Mounts and Accessories

Purpose

You must mount the M2HB .50-caliber machinegun to fire. Along with the mount, you need to install a traversing and elevating mechanism to permit a high degree of accuracy and control.

M3 Tripod Mount

The M3 tripod mount is the principal ground mount for the M2HB .50caliber machinegun shown in the picture below.

The tripod has three folding, telescopic legs that can be stomped into the ground for greater stability. The gun is connected to the tripod by a pintle that is semi-permanently attached to the gun. The pintle seats into the tripod head and is locked in place. A traversing bar between the two trail legs serves as a support for the traversing and elevating (T&E) mechanism. The T&E mechanism attaches to the rear of the gun and is locked onto the traversing bar. Continued on next page

MCI Course 8017A

5-10

Study Unit 5, Lesson 1

Mounts and Accessories, Continued

Pintle Vehicle Mount

The M2HB .50-caliber machinegun can be mounted on two different mounts: · ·

High mobility multipurpose wheeled vehicle (HMMWV) weapons station M66 ring mount

Each of these mounts has a pintle adapter that accepts the pintle shown below.

HMMWV Weapons Station

The HMMWV weapons station has a ring mount that, used with the MK64 cradle mount, will accept the M2HB .50-caliber machinegun, as pictured below.

Continued on next page

MCI Course 8017A

5-11

Study Unit 5, Lesson 1

Mounts and Accessories, Continued

M66 Ring Mount

The M66 ring mount is installed on trucks and other combat vehicles. A truck mounted version is shown below.

T&E Mechanism

Used on both ground and vehicle mounts, the T&E mechanism for the M2HB .50-caliber machinegun ·

Secures the rear of the machinegun to its mount.

·

Permits fire control adjustment.

·

Allows the machinegun to traverse 400 mils to the left or right of the 0 index on the traversing bar on the M3 tripod mount.

·

Allows the elevation of the machinegun to range from 100 mils in elevation to 250 mils in depression.

Note: For more information on the T&E mechanism, see study unit 7. AN/TVS-5 Night Vision Sight

MCI Course 8017A

The AN/TVS-5 night vision sight, used for passive night observation and fire, can be mounted on the M2HB .50-caliber machinegun. Portable and battery operated, the AN/TVS-5 night vision sight amplifies natural light such as moonlight, starlight, and skyglow without emitting visible or infrared light that the enemy can detect.

5-12

Study Unit 5, Lesson 1

Ammunition

Ammunition Types

MCI Course 8017A

The M2HB .50-caliber machinegun cartridge consists of a cartridge case, primer, propelling charge, and bullet. The table below describes the types of ammunition, each identifiable by the color of the tip. Type Ball (M2, M33)

Color of tip No color

Tracer (M1, M10, M17)

Red, maroon, or orange

Armor-piercing (M2)

Black

Incendiary (M1, M23) Armor-piercing incendiary (M8) Armor-piercing incendiary tracer (M20)

Blue or light blue

Blank (M1, M1A1) Dummy (M2) Sabot light armor penetrator (SLAP) M903

No bullet

Aluminum-colored Aluminum with red tip

Used for · Marksmanship training · Anti-personnel · Light material targets · Aiding in observing fire · Incendiary effect · Signaling · Armored aircraft · Lightly armored vehicles · Concrete shelters · Other bullet-resisting targets Incendiary effect, especially against aircraft Combined armor-piercing and incendiary effect · Combined armorpiercing and incendiary effect · Additional tracer features Simulated firing

No color on tip; holes in Instructional purposes cartridge case (completely inert) Plastic sleeve on projectile Armor piercing

5-13

Study Unit 5, Lesson 1

Cycle of Operation

Eight Steps

The cycle of operation of the M2HB .50-caliber machinegun consists of the following eight steps: Step 1

Action Firing. The firing pin is released, igniting the primer of the cartridge.

2

Unlocking. The bolt is unlocked from the barrel and barrel extension.

3

Extracting. The empty cartridge case is pulled from the chamber.

Continued on next page MCI Course 8017A

5-14

Study Unit 5, Lesson 1

Cycle of Operation, Continued

Eight Steps, continued

Step 4 5 6

MCI Course 8017A

Action Ejecting. The empty cartridge case is expelled from the receiver. Cocking. The firing pin is withdrawn into the cocked position. Feeding. During feeding, the cartridge is placed in the receiver.

7

Chambering. During chambering, the cartridge is placed into the chamber of the weapon.

8

Locking. The bolt is locked to the barrel and barrel extension.

5-15

Study Unit 5, Lesson 1

Lesson 1 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 11 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

Which one of the following is a capability of the M2HB .50-caliber machinegun? a. b. c. d.

Item 2

Destroys heavily armored vehicles Defends against aircraft at high altitudes Protects motorized movements Supports the infantryman only in the attack

What are the three descriptive characteristics of the M2HB .50-caliber machinegun? a. b. c. d.

Belt-fed, air-cooled, gas operated Belt-fed, water-cooled, recoil-operated Magazine-fed, air-cooled, blowback-operated Belt-fed, air-cooled, recoil-operated Continued on next page

MCI Course 8017A

5-16

Study Unit 5, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Items 3 Through 5

Matching: In the spaces provided, place the letter of the function from column 2 that corresponds to the M2HB .50-caliber machinegun mount in column 1. The answers in column 2 may be only used once. Column 1

Column 2

Mount

Function

___ 3. ___ 4. ___ 5.

Items 6 Through 10

M66 ring mount Vehicle mount M3 tripod

Matching: In the space provided, place the letter of the color of the tip from column 2 that best describes the type of M2HB .50-caliber ammunition in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Type of Ammunition

Color of Tip

___ 6. ___ 7. ___ 8. ___ 9.

a. b. c. d.

Ball Armor-piercing Incendiary Armor-piercing incendiary tracer ___ 10. Tracer Item 11

a. Is the principal ground mount b. Is installed on trucks and other combat vehicles c. Uses a pintle adaptor that accepts the gun's pintle d. Secures the rear of the M2HB .50-caliber machine to its mounts

Black Red, maroon, or orange No color Blue or light blue ring with blue tip e. Aluminum ring with red tip

What step in the cycle of operation places the cartridge into the chamber of the weapon? a. b. c. d.

Locking Feeding Chambering Ejecting Continued on next page

MCI Course 8017A

5-17

Study Unit 5, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8 9 10 11

MCI Course 8017A

Answer c d b c a c a d e b c

5-18

Reference Page 5-5 5-9 5-12 5-11 5-10 5-13 5-13 5-13 5-13 5-13 5-15

Study Unit 5, Lesson 1 Exercise

LESSON 2 CLEARING, DISASSEMBLING, CLEANING, AND INSPECTING Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson discusses how to clear, disassemble, clean, and inspect the M2HB .50-caliber machinegun.

Learning Objectives

After completing this lesson, you should be able to ·

Identify the steps to clear the M2HB .50-caliber machinegun.

·

Identify the steps to disassemble the M2HB .50-caliber machinegun.

·

Identify the maintenance schedule for the M2HB .50-caliber machinegun.

·

Identify the cleaners and lubricants by function for the M2HB .50-caliber machinegun.

·

Identify the steps to clean the M2HB .50-caliber machinegun.

·

Identify the steps for inspecting the M2HB .50-caliber machinegun. Continued on next page

MCI Course 8017A

5-19

Study Unit 5, Lesson 2

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction Clearing Disassembling Cleaning Inspecting Lesson 2 Exercise

MCI Course 8017A

5-20

See Page 5-19 5-21 5-22 5-29 5-31 5-32

Study Unit 5, Lesson 2

Clearing

Procedures

Before you begin disassembly of the M2HB .50-caliber machinegun, you must clear it to make sure it is completely safe. The steps to clear the weapon are listed in the table below. Step 1

Action Place the gun in the single shot mode by rotating the buffer tube sleeve to the right and releasing the bolt latch to the up position as shown in the picture below.

2

Raise the feed cover by rotating the cover latch forward and lifting straight up as shown in the picture below.

3 4 5 6 7 8 9

Remove ammunition if present. Close the feed cover assembly. Grasp the slide handle and lock the bolt to the rear. Open the feed cover assembly. Inspect the T slot on the face of the bolt and chamber. Press the bolt latch release and ride the bolt forward. Close the feed cover assembly. Note:

MCI Course 8017A

Never close the cover with the bolt to the rear.

5-21

Study Unit 5, Lesson 2

Disassembling

Procedures

After you clear the M2HB .50-caliber machinegun, you may begin disassembly into the six main groups for cleaning and inspection. Disassembly consists of the following sequential steps: Step 1 2 3 4 5 6 7

Components

Action...removing the Barrel group Backplate Drive spring rod assembly Bolt group Barrel extension Barrel buffer body Barrel buffer assembly

The picture below shows the components of the M2HB .50-caliber machinegun.

Continued on next page

MCI Course 8017A

5-22

Study Unit 5, Lesson 2

Disassembling, Continued

Barrel Group

Disassembling the barrel group consists of the steps listed in the table below. Step 1

Action Turn the cover latch and raise the cover group as shown below.

2 3

Pull the retracting handle back until the lug on the barrel locking spring aligns with the 3/8-inch hole on the right side of the receiver. Turn the barrel clockwise until it disengages.

4

Set the barrel aside, being careful not to damage the threaded end. Continued on next page

MCI Course 8017A

5-23

Study Unit 5, Lesson 2

Disassembling, Continued

Backplate

To remove the backplate, follow the steps listed in the table below. Step 1

2 3

Action Pull out on the backplate latch lock and up on the backplate latch as shown in the picture below. Note the placement of the hands in the picture.

Lift the entire backplate straight up. Set the backplate aside with the handles down. Continued on next page

MCI Course 8017A

5-24

Study Unit 5, Lesson 2

Disassembling, Continued

Drive Spring Rod Assembly

The drive spring on the M2HB .50-caliber machinegun is located on the right side of the receiver as shown in the picture below.

The table below lists the steps to remove the drive spring. Removing the Drive Spring

Step Action 1 Push in on the head of the drive spring and then slightly to the left to unseat it from the right side plate. WARNING:

2

Never attempt to cock the gun while the backplate is off and the drive spring is in place. The drive spring can seriously injure you if it is compressed and slips from its seat in the sideplate. Pull the drive spring to the rear and out of the receiver. Continued on next page

MCI Course 8017A

5-25

Study Unit 5, Lesson 2

Disassembling, Continued

Bolt Group

Remove the bolt group from the receiver by following the steps listed in the table below. Step 1 2

Action Grasp the retracting slide handle and give it a quick jerk, freeing the bolt from the barrel extension. Align the collar of the bolt stud with the clearance hole in the bolt slot on the right sideplate and remove the bolt stud as shown below.

3

Slide the bolt to the rear and out of receiver as shown below.

4

Place the bolt down on its right side (with the extractor arm up) so that the extractor will not fall from the bolt. Continued on next page

MCI Course 8017A

5-26

Study Unit 5, Lesson 2

Disassembling, Continued

Barrel Extension and Buffer Body Group

The following table lists the steps to remove the barrel buffer body group and the barrel extension group from the M2HB .50-caliber machinegun.

Step 1 2

3 4

Action Insert a combination tool (or pointed instrument) through the hole in the lower rear corner of the right sideplate. Push in on the barrel buffer body lock. At the same time, place one hand on the receiver and push the barrel extension and barrel buffer body groups to the rear as shown in the picture below.

Remove both groups from the receiver. Separate the two groups by pushing forward on the tips of the accelerator as shown below.

Continued on next page

MCI Course 8017A

5-27

Study Unit 5, Lesson 2

Disassembling, Continued

Barrel Buffer Assembly

MCI Course 8017A

The last step to disassembly is to pull the barrel buffer assembly from the rear of the barrel buffer body group as shown below:

5-28

Study Unit 5, Lesson 2

Cleaning

Maintenance Schedule

Care, cleaning, and maintenance determine whether or not your machinegun will function properly when you need it. You should maintain your M2HB .50-caliber machinegun on a regular basis. As a general rule, you should clean your gun · · · · ·

Cleaners and Lubricants

After firing At least daily when under combat/field conditions Several times per day when under extreme climatic conditions For three consecutive days upon returning from the field Every five days when the gun is in storage

The following table lists several types and functions of cleaners and lubricants that you may use to clean the M2HB .50-caliber machinegun. Type Function Cleaner-lubricant- Cleans, lubricates, and preserves. preservative (CLP) Note: This is the preferred material for cleaning the .50-caliber machinegun. Rifle bore cleaner Cleans powder residue, carbon, and dirt. (RBC) Note: You must lubricate the gun after using RBC. PL special Lubricates and preserves. (lubricating oil, Note: The thin oil may be used as a temporary measure general purpose) to lubricate entire weapon if you do not have CLP. Lubricant, semiUsed on friction-producing parts and on the exterior of fluid, automatic the weapon. weapons (LSA) Note: This thicker oil lasts longer than CLP and will not burn off by firing or wash away with rain. Lubricant, arctic Used for extremely cold weather (below 0o Fahrenheit). weather (LAW) Hot, soapy water Used on the barrel when RBC or CLP are not available. Note: Dry barrel and apply a thin coat of PL special after using hot, soapy water. Continued on next page

MCI Course 8017A

5-29

Study Unit 5, Lesson 2

Cleaning, Continued

Procedure

After you disassemble the gun into its major components, you can begin to clean the different parts. The following table lists the steps to properly clean the M2HB .50-caliber machinegun. Step 1 2 3

Action Inspect all parts for cracks, burrs, wear, or rust. Clean the bore and chamber with RBC and lightly oil with PL special. Or, use CLP to clean and lubricate. Clean all metal parts thoroughly and apply a light coat of CLP. Notes: Do not apply CLP to the metal parts that may contact the ammunition.

4 5

MCI Course 8017A

Do not use cleaning agents or CLP on plastic or wooden parts. Reassemble the weapon. Be sure the exterior is lightly oiled. Clean and lubricate the mount and accessories.

5-30

Study Unit 5, Lesson 2

Inspecting

Procedure

When you conduct an inspection, the machinegun should be completely assembled and mounted with headspace and timing properly set. The following table lists the steps to inspect the M2HB .50-caliber machinegun. Step 1 2 3 4 5 6

MCI Course 8017A

Action Inspect the bore and chamber for rust. Be sure they are clean and lightly lubricated. Operate the retracting slide handle and the bolt latch release several times to see if the parts function without excessive friction. Be sure that moving parts are lightly lubricated. Check headspace and timing with gauges. Be sure the rear sight is in good condition, clean, and lightly lubricated. Set the elevation to 1000 and windage to zero. Inspect the mount to be sure it is clean, lightly lubricated, and all clamps are securely tightened. Inspect spare parts and tools to be sure they are clean.

5-31

Study Unit 5, Lesson 2

Lesson 2 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 though 6 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

What is the last step you must accomplish to clear the M2HB .50-caliber machinegun? a. b. c. d.

Item 2

After removing the barrel from the receiver of the M2HB 50-caliber machinegun, the next procedure for disassembling is to remove the a. b. c. d.

Item 3

Close the feed cover and pull the bolt to the rear. Close the feed cover assembly. Place the machinegun in the single shot mode. Pull the retracting slide handle to the rear.

backplate. T-block. bolt. drive spring.

While deployed in a desert environment with constant high winds and sand storms, the maintenance schedule that must be followed to keep the units M2HB .50-caliber machinegun in proper working order is to clean it a. b. c. d.

after firing. several times per day. at least daily. for three consecutive days. Continued on next page

MCI Course 8017A

5-32

Study Unit 5, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Item 4

What is the preferred cleaner/lubricant for use on your M2HB .50-caliber machinegun? a. b. c. d.

Item 5

RBC CLP PL special Hot soapy water

Four of the five steps to clean the M2HB .50-caliber machinegun are listed below: 1. Disassemble the machinegun into its main groups. Inspect all parts for cracks, burrs, wear, or rust. 2. Clean the bore and chamber with RBC, then lightly oil with PL special; or use CLP. 3. Clean all metal parts thoroughly and apply a light coat of CLP. 4. Reassemble the weapon, and ensure that the exterior is lightly oiled. Which step is missing for cleaning the M2HB .50-caliber machinegun? a. b. c. d.

Item 6

Remove the backplate. Remove the T block. Use CLP to clean all metal parts that may contact ammunition. Clean and lubricate the mount and accessories.

What is the first step in inspecting the M2HB .50-caliber machinegun? a. Check headspace and timing with gauge. b. Inspect spare parts and tools to be sure the are clean. c. Inspect the bore and chamber for rust and be sure they are lightly lubricated. d. Inspect the mount to be sure it is clean, lightly lubricated, and that all clamps are securely tightened. Continued on next page

MCI Course 8017A

5-33

Study Unit 5, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6

MCI Course 8017A

Answer b a b b d c

5-34

Reference Page 5-21 5-22 5-29 5-29 5-30 5-31

Study Unit 5, Lesson 2 Exercise

LESSON 3 ASSEMBLING AND CONDUCTING THE FUNCTION CHECK Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson discusses how to assemble and perform a function check on the M2HB .50-caliber machinegun.

Learning Objectives

After completing this lesson you should be able to

In This Lesson

·

Identify the steps to assemble the M2HB .50-caliber machinegun.

·

Identify the steps to perform a function check on the M2HB .50-caliber machinegun.

This lesson contains the following topics: Topic Introduction Assembling Performing a Function Check Lesson 3 Exercise

MCI Course 8017A

5-35

See Page 5-35 5-36 5-41 5-49

Study Unit 5, Lesson 3

Assembling

Procedure

To assemble the .50-caliber machinegun, replace the groups in the reverse order of disassembly. Assembly is accomplished by completing the procedures below. · · · · · ·

Connecting the Barrel Buffer Group

Connect the barrel buffer group Install the barrel buffer and extension groups Install the bolt stud Replace the drive spring Replace the backplate Replace the barrel

The following table lists the steps to connect the barrel buffer assembly and the barrel buffer body. Step 1

2

Action Turn the barrel buffer tube until the screwdriver slot in the rear of the tube is vertical and the arrow points to right, as shown below:

Push the barrel buffer assembly fully forward, as shown below:

Continued on next page MCI Course 8017A

5-36

Study Unit 5, Lesson 3

Assembling, Continued

Install the Barrel Buffer and Extension Groups

The following table lists the steps to join the barrel buffer and the barrel extension groups.

Step 1 2

Action Hold the barrel buffer group in your right hand with your index finger supporting the accelerator. Join the notch on the shank of the barrel extension group with the cross-groove in the piston rod of the barrel buffer assembly. At the same time, align the breech lock depressors with the guideways in the sides of the barrel extension, as shown below.

3

Push the groups together.

4

Note: The accelerator should rotate rearward. Place the groups in the receiver and push them forward until the barrel buffer body spring lock snaps into position. Note:

The barrel buffer tube should protrude about 1 1/8 inches from the rear of the barrel buffer body group. Continued on next page

MCI Course 8017A

5-37

Study Unit 5, Lesson 3

Assembling, Continued Install Bolt Stud

The following table lists the steps to install the bolt stud and lock the barrel buffer, barrel extension group, and the bolt into receiver. Step 1 2 3

4 5

Action Look at the bolt to be sure the extractor assembly is down and the cocking lever is inclined to the front. Align the rails on the bolt with the grooves on the barrel extension and slide bolt about halfway onto the barrel extension. Insert the barrel buffer, barrel extension, and bolt into the back of the receiver as shown below.

Note: You should hear two clicks · One for the body lock snapping in · Another for the bolt latch connecting with the top of the receiver. Press up on the bolt latch and push the bolt forward until the hole is aligned with the clearance hole on the right side of the receiver. Replace the bolt stud and push the bolt as far forward as you can, as shown below.

Continued on next page

MCI Course 8017A

5-38

Study Unit 5, Lesson 3

Assembling, Continued

Replace the Drive Spring

The following table lists the steps to replace the drive spring. Step 1 2

3

Replace the Backplate

Action Insert the spring into its hole in the rear of the bolt and push it all the way in. Press in and to the right until the retaining pin slips into the hole on the right sideplate. Note: The spring will be slightly compressed. If the buffer does not go all the way into the receiver with the bolt, take the barrel buffer, barrel extension, and bolt out of the receiver and repeat the above steps.

The following table lists the steps to replace the backplate. Step 1 2

3

Action Pull the backplate latch lock out and slide the backplate onto the back of the receiver. Continue to hold the backplate latch lock out and lightly tap the backplate down with your hand until it is all the way down as shown in the picture below.

Release the latch. Continued on next page

MCI Course 8017A

5-39

Study Unit 5, Lesson 3

Assembling, Continued

Replace the Barrel

The following table lists the steps to replace the barrel. Step 1 2

3 4 5 Summary

MCI Course 8017A

Action Pull back the retracting slide handle until the lug on the barrel locking spring is visible through the 3/8-inch hole in the right sideplate. Place the smallest loop of a .50-caliber link between the trunnion block and the barrel extension. Note: If a link isn’t available, you can hold this alignment by hand. Place the barrel into the front of the receiver and carefully start the threads. Screw the barrel all the way in, then back it off two clicks. Close the cover and remove the link if you used one.

Assembling the components of the M2HB 50 caliber machinegun is just the first step of operator maintenance. The next step is to ensure that the weapon is properly assembled.

5-40

Study Unit 5, Lesson 3

Performing a Function Check

Schedule

A function check of the M2HB .50-caliber machinegun ensures that the weapon is correctly assembled and should also be preformed before firing to ensure the weapon is in working order. Important:

You must set headspace and adjusting timing before conducting a function check.

Headspace Definition

Headspace is the distance between the face of the bolt and the chamber when a round is fully seated in the chamber.

Setting Headspace

Setting proper headspace is critical to operation of the M2HB .50-caliber machinegun. The correct headspace allows room for the rim of the round when chambered. The following table describes the results of incorrect headspace. If the headspace is set too… Tight Loose

Then… Firing will be sluggish and slow. Cartridge cases may bulge or even explode in the receiver. Continued on next page

MCI Course 8017A

5-41

Study Unit 5, Lesson 3

Performing a Function Check, Continued

Headspace Gauge

To set headspace on the M2HB 50 caliber machinegun the operator needs the gauges shown below.

Continued on next page

MCI Course 8017A

5-42

Study Unit 5, Lesson 3

Performing a Function Check, Continued

Setting Headspace

Follow the steps in the table below to set headspace. Step 1 2

Action Ensure the gun cleared and the bolt is forward. Pull back on the retracting slide handle until the locking spring lug aligns with the 3/8-inch hole on the right sideplate as shown in the picture below. Back barrel off two clicks from tight.

3

Grasp the retracting slide handle and pull the bolt to the rear, thus cocking the weapon. Pull the bolt back 1/16-inch and raise the extractor arm up. Insert the GO end of the headspace gauge between the face of the bolt and the chamber as shown below.

4 5

Continued on next page

MCI Course 8017A

5-43

Study Unit 5, Lesson 3

Performing a Function Check, Continued

Setting Headspace, continued

Step 6

7

Action If the GO end · Fits, go to step 7. · Does not fit, go to step 8. Turn the gauge over and try to insert the NO GO end. If the NO GO end ·

8 9

Does not fit, headspace is correct. You have completed setting headspace. · Fits, go to step 9. Unscrew the barrel one click and repeat step 5. Screw the barrel in one click and try to insert the GO end of the headspace gauge. Repeat step 6. Continued on next page

MCI Course 8017A

5-44

Study Unit 5, Lesson 3

Performing a Function Check, Continued

Timing

Timing is achieved by adjusting the machinegun so that the moving parts do the right thing at the right time during the cycle of operation. Firing actually takes place just before the bolt is all the way forward. The machinegun must be adjusted to be sure this happens. Timing must be checked and adjusted each time headspace is set or when timing is questionable

Timing Gauges

The picture below shows the placement of the timing gauges between the bolt and barrel assembly. In this case, the fire gauge has been inserted.

Preparing the Machinegun

The operator must ensure the following items from the table below are completed before adjusting timing. Note: Timing must be checked every time headspace is completed. Step 1 2 3 4

Action Cock the machinegun Ride the bolt slowly home Raise the feed cover Raise the extractor Continued on next page

MCI Course 8017A

5-45

Study Unit 5, Lesson 3

Performing a Function Check, Continued

Adjusting Timing

After ensuring the weapon is prepared, perform the following steps from the table below to adjust timing. Step 1 2

3 4

Action Pull the retracting handle back until you have a ¼-inch space between the barrel extension and the trunnion block. Insert the NO-Fire gauge between the barrel extension and the trunnion block with the beveled edge of the gauge resting on the barrel notches, as shown below:

Slowly let the barrel extension close by releasing the retracting slide handle. Depress the trigger; and refer to the table below: If weapon does Not fire Fires

5 6 7 8

Then go to Step 16 Step 5

Remove gauge and cock weapon. Insert the Fire gauge, as stated in step 2. Remove backplate. Screw the timing adjustment nut, as shown in the picture below, to the left until it rests lightly on the trigger lever.

Continued on next page MCI Course 8017A

5-46

Study Unit 5, Lesson 3

Performing a Function Check, Continued

Adjusting Timing, continued

Step 9 10

11 12 13

Action Turn the adjustment nut to the right one click. With firm upward pressure, push up on the trigger lever as shown in the picture below.

Repeat steps 9 through 10 until the firing pin releases (fires). When the firing pin releases, turn the timing adjustment nut two additional clicks to the right. Replace the backplate and remove the FIRE gauge. Never attempt to cock the machinegun with the backplate off. Grasp the retracting slide handle, pull the handle back, and release it to cock weapon. Repeat steps 2 through 4. Insert the FIRE gauge. Try to fire the machinegun by pressing the trigger. WARNING:

14 15 16 17

If the machinegun… Fires Does not fire

Then… Timing is correct, stop. Go to step 6. Continued on next page

MCI Course 8017A

5-47

Study Unit 5, Lesson 3

Performing a Function Check, Continued

Function Check

The operator must ensure the weapon is assembled properly. The table below lists the procedure to follow. Step 1 2 3 4 5 6 7 8 9

MCI Course 8017A

Action Place the weapon in single-shot mode. Open the cover and lock the bolt to the rear. Return the retracting slide handles to full forward position and press the bolt latch release. Press down on the trigger. The weapon should fire. Place the weapon in the automatic-fire mode. Pull the retractor slide handle to the rear and release. Make sure the firing pin does not protrude. Press down on the trigger. The weapon should fire. Make sure the firing pin does protrude.

5-48

Study Unit 5, Lesson 3

Lesson 3 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 2 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

What is the next step in assembling the M2HB .50-caliber machinegun after installing the barrel buffer and extension group? a. b. c. d.

Item 2

Replace the drive spring and T block. Replace the barrel buffer group only. Install the bolt stud. Replace the T block and barrel buffer and barrel extension groups.

You are setting headspace and have just inserted the GO end of the headspace gauge. The GO end did not fit. What is your next step? a. Insert the NO GO end of the headspace gauge. b. Alternate unscrewing the barrel one click and inserting the GO end of the headspace gauge until it fits. c. Your headspace is correct. Continue with the function check. d. Take the machinegun to armory for maintenance check. Continued on next page

MCI Course 8017A

5-49

Study Unit 5, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2

MCI Course 8017A

Answer c b

5-50

Reference Page 5-36 5-44

Study Unit 5, Lesson 3 Exercise

LESSON 4 SIGHTING, FIRING, AND CONDUCTING IMMEDIATE ACTION Introduction

Estimated Study Time

25 minutes

Lesson Scope

The objective of this lesson is to discuss how to sight, fire, identify a malfunction or stoppage, and apply immediate action to the M2HB .50caliber machinegun.

Learning Objectives

After completing this lesson, you should be able to ·

Identify the definition for sight alignment for the M2HB .50-caliber machinegun.

·

Identify the two firing modes for the M2HB .50-caliber machinegun.

·

Identify firing positions for the M2HB .50-caliber machinegun.

·

Identify the types of malfunctions for the M2HB .50-caliber machinegun.

·

Identify common stoppages for the M2HB .50-caliber machinegun.

·

Identify the steps of immediate action for the M2HB .50-caliber machinegun. Continued on next page

MCI Course 8017A

5-51

Study Unit 5, Lesson 4

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction Sighting Firing Malfunctions and Stoppages Immediate Action Lesson 4 Exercise

MCI Course 8017A

5-52

See Page 5-51 5-53 5-56 5-60 5-63 5-64

Study Unit 5, Lesson 4

Sighting

Rear Sight

The M2HB .50-caliber machinegun has a leaf-type rear sight as shown in the picture below:

The rear sight is graduated in both yards and mils from 100 to 2,600 yards and from 0 to 62 mils and has two positions. ·

Down. When in the down position as shown in the picture below, it is used for ranges from 0 to 400 yards.

·

Up. When in the up position as shown in the picture below, it is used for ranges from 400 to 2600 yards.

·

In both the up and down positions has a rear sight aperture or peep sight. Continued on next page

MCI Course 8017A

5-53

Study Unit 5, Lesson 4

Sighting, Continued

Front Sight

The front sight is a semifixed blade-type with cover as shown in the picture below.

Sight Alignment

Using the rear sight aperture and the front sight blade in combination is called sight alignment. Correct sight alignment for the .50-caliber machinegun occurs when the front sight blade is centered and halfway up in the rear sight aperture as shown in the picture below.

Sight Picture

A proper sight picture occurs when the top edge of the front sight at the center base of the target while maintaining sight alignment as shown in the picture below.

Continued on next page

MCI Course 8017A

5-54

Study Unit 5, Lesson 4

Sighting, Continued

Adjusting Sights

You can adjust the rear sight for both elevation and windage as shown in the picture below.

Elevation

To change elevation, turn the elevation knob (on the top of the sight) so that the index line moves to the required elevation scale line. The odd-numbered elevation scale is on the left and the even-numbered scale is on the right.

Windage

To change windage, turn the windage knob (at the bottom on the left side of the sight) forward or back. The windage knob permits a change of five mils left or right of center.

MCI Course 8017A

5-55

Study Unit 5, Lesson 4

Firing

Two Modes

Firing the M2HB .50-caliber machinegun is not complicated. You must load the gun differently for both modes which include the · ·

Automatic Firing Mode

Automatic firing mode Single shot mode

The table lists the steps to load the M2HB .50-caliber machinegun for the automatic firing mode. Step 1 2 3 4 5 6

7

Action Clear the machinegun. Close the bolt by pressing the bolt latch release. Use the retracting slide handle to slowly ride the bolt home. Close the feed cover. Lock down the bolt latch release by pressing down on the bolt latch release and rotating it to the left until it is locked in the down position. This sets the gun for automatic fire. Insert the belt of ammunition into the feedway until you hear the click of the belt-holding pawl engaging the belt of ammunition. Cock the gun by vigorously pulling back the retracting slide handle and then releasing it. Allowing the drive spring to carry the handle and bolt group forward. This is called half-loading. If the trigger is pushed, the gun will not fire. Be sure to re-cock the gun as you did in step 6 so that the gun is fully loaded. Now, when you push the trigger, the machinegun will fire in the automatic mode. Continued on next page

MCI Course 8017A

5-56

Study Unit 5, Lesson 4

Firing, Continued

Single Shot Mode

The following table lists the steps to load the .50-caliber machinegun so that it fires one round at a time. Step 1 2 3 4 5 6 7 8 9

Action Clear the machinegun. Close the bolt by pressing the bolt latch release. Use the retracting slide handle to slowly ride the bolt home. Close the feed cover. With the bolt latch release in the up position, be sure the bolt latch release lock is to the right. The gun is now set for single shot firing. Insert the belt of ammunition into the feedway until you hear a click. Cock the gun by vigorously pulling back the retracting slide handle. The bolt will lock to the rear. Push the bolt latch release allowing the drive spring to carry the bolt group forward. The gun is now half-loaded. Repeat steps 6 and 7 to fully load the gun. When the trigger is pushed, the gun will fire one round and then the bolt will lock to the rear. To fire another round, you must first push down on the bolt release, allowing the bolt to go home under the power of the drive spring. Continued on next page

MCI Course 8017A

5-57

Study Unit 5, Lesson 4

Firing, Continued

Firing Positions

When the .50-caliber machinegun is mounted on the M3 tripod, you can use the · ·

Prone position Two types of sitting positions · ·

Legs folded Legs extended

In any of these three positions, your grip will be the same. With your right hand on the spade grip and your thumb in position to press the trigger, use a light grip with a slight downward pressure. Your left hand should be palm down on the elevating hand wheel and applying a slight downward pressure. When you fire, use long bursts (8 to 10 rounds) and watch for the impact to make adjustments. When the machinegun is mounted on a vehicle mount, place both hands on the spade grips with your thumbs in position to press the trigger. Keep your elbows tucked in to your sides and lean forward until your chest touches your hands. Brace your body and arms firmly during firing. Continued on next page

MCI Course 8017A

5-58

Study Unit 5, Lesson 4

Firing, Continued

Field Zeroing

Field zeroing is adjusting the sights so that the rounds will hit where the sights are pointing. The following table lists the steps to field zero the .50caliber machinegun. Step 1 2 3 4 5

Action Determine the range to the target. Adjust the rear sight for elevation according to the range you just determined in step 1. Center the windage scale by turning the windage knob until the centerlines are aligned. Be sure the bolt is forward now with a round in the chamber. Obtain proper sight alignment and sight picture on the target using the traversing and elevating handwheels. Fire one round and observe the strike. If the round · Hits where you are aiming, the gun is zeroed.

6

7 8 9

MCI Course 8017A

· Does not hit where you are aiming, go to step 6. Without moving the gun, sight in on the point of impact. Note: Move the rear sight elevation and windage knobs, not the traversing and elevating handwheels! Press the bolt latch release to send the bolt forward, chambering another round. Obtain sight alignment and sight picture on the original target using the traversing and elevating handwheels. Fire one round and observe where the round hits. If the round ·

Hits where you were aiming, the gun is zeroed.

·

Does not hit where you were aiming, repeat steps 6 through 9 until a round hits the target.

5-59

Study Unit 5, Lesson 4

Malfunctions and Stoppages

Malfunctions

Malfunctions and stoppages can occur at any time when you fire the .50caliber machinegun. You and your crew must know what the problem is and how to correct it. A malfunction is any failure of the gun to function satisfactorily. Normally the two types of malfunctions are ·

·

Failure to function freely (sluggish operation). It is usually ·

Due to human failure to eliminate excessive friction caused by dirt, lack of proper lubrication, burred parts, tight headspace adjustment, or incorrect timing.

·

Corrected by cleaning, lubricating, and resetting headspace and timing.

Uncontrollable automatic fire (runaway gun), which is continued fire after you release the trigger. It is ·

Always caused by defective parts.

·

Corrected by keeping the gun laid in on target and twisting the ammunition belt, so the gun jams. If only a few rounds are on the belt, let the gun fire them out. Report the problem to your armorer. Continued on next page

MCI Course 8017A

5-60

Study Unit 5, Lesson 4

Malfunctions and Stoppages, Continued Stoppages

A stoppage is any interruption in the cycle of operation caused by the faulty action of the gun or ammunition. The following table lists the common stoppages, their causes, and steps to correct them. Type of Stoppage Failure to feed

Usual Causes Defective ammunition belt · Defective feed mechanism · Improperly loaded belt

Failure to chamber

Obstruction in T-slot or chamber

Failure to fire

Steps to Correct It Change ammunition belt. Check the feedway by pushing down on the feed pawls to be sure enough spring tension exists to hold the belt place.

Inspect the chamber and the T-slot for an obstruction or dirt, then clear them. You may use a cleaning rod or other tool to help push the obstruction (usually a cartridge case) out of the bottom of the receiver. Ruptured case If a ruptured cartridge case is stuck in the chamber, try to force it out by inserting a cleaning rod into the muzzle of the weapon and pushing. If this fails, you must use a ruptured cartridge case extractor. Change the ammunition belt. · Defective Inspect parts of firing ammunition · Defective parts in mechanism for defects. firing mechanism Continued on next page

MCI Course 8017A

5-61

Study Unit 5, Lesson 4

Malfunctions and Stoppages, Continued

Using the Ruptured Cartridge Case Extractor

The following table lists the steps to use the ruptured cartridge case extractor shown in the picture below.

Step 1 2 3 4

MCI Course 8017A

Action Raise the cover and pull the bolt to the rear. Place the ruptured case extractor in the T-slot of the bolt, as you would a cartridge. The ejector of the extractor assembly will hold the extractor in line with the bore. With the ruptured cartridge extractor aligned, let the bolt go forward. This forces the extractor through the ruptured case, and the shoulders will spring out in front of the case. Pull the bolt to rear and remove the ruptured case and the extractor.

5-62

Study Unit 5, Lesson 4

Immediate Action

Procedure

Immediate action is the procedure you use when a stoppage of fire occurs and you cannot stop to analyze its cause. The gunner usually performs immediate action; however, every crewmember must know how to apply it. The following table lists the steps to take immediate action. Step 1 2 3 4

Action Wait 5 seconds. A hang-fire may be causing the misfire. If the gun is very hot, it may “cook off” the round. Cock the gun and observe for feeding and ejecting. Re-lay on target. Try to fire. If the gun… Fires Does not fire

5

Repeat steps 1 through 4. If the gun… Fires Does not fire

MCI Course 8017A

Then… Continue with your mission. Go to step 5.

5-63

Then… Continue with your mission. Clear the gun and inspect it to determine the cause of the stoppage.

Study Unit 5, Lesson 4

Lesson 4 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 10 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

When the sight alignment for the M2HB .50-caliber machinegun is correct, the front sight blade a. b. c. d.

Item 2

is at the bottom of the rear sight aperture. is at the top of the rear sight aperture. blocks out the entire rear sight aperture. is centered and halfway up in the rear sight aperture.

You are loading your M2HB .50-caliber machinegun to fire in the automatic firing mode. You have cleared the gun, closed the bolt, and closed the feed cover. Which step will you perform next? a. Cock the gun. b. Press the trigger. c. Press down on the bolt latch release and rotate the bolt latch release lock until the bolt latch release is locked in the down position. d. Insert the belt of ammunition into the feedway.

Item 3

Which one of the following is a firing position for the M2HB .50-caliber machinegun? a. b. c. d.

Bent leg prone Folded leg sitting (legs folded) Kneeling Supported standing Continued on next page

MCI Course 8017A

5-64

Study Unit 5, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Item 4

You have been on the range firing your .50-caliber machinegun and you notice that it is not functioning freely and is operating sluggishly. What corrective action should you take? a. b. c. d.

Items 5 Through 9

Change the belt of ammunition. Inspect the chamber and the T slot for an obstruction. Keep the machinegun laid on target and twist the ammunition belt. Clean and lubricate your machinegun, and then reset headspace and timing.

Matching: In the space provided, place the letter of the identification of the failure in column 2 that best describes the failure item in column 1. The answers in column 2 may be used more than once. Column 1

Column 2

Failure Item

Failure Identification

___ 5. ___ 6. ___ 7. ___ 8. ___ 9. Item 10

What is the first thing the gunner must do while performing immediate action? a. b. c. d.

MCI Course 8017A

Failure to function freely a. Malfunction Failure to fire b. Stoppage Failure to feed Uncontrollable automatic fire Failure to chamber

Clear the gun and inspect to determine the cause of the stoppage. Attempt to fire again. Re-lay on target. Wait 5 seconds to see if the round will “cook off.”

5-65

Study Unit 5, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Answers

The following table provides the answers to the items on the previous page. If you have any questions concerning this summary check, refer back to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8 9 10

MCI Course 8017A

Answer d c b d a b b a b d

5-66

Reference Page 5-54 5-56 5-58 5-60 5-60 5-61 5-61 5-60 5-61 5-63

Study Unit 5, Lesson 4 Exercise

STUDY UNIT 6 MK19 MACHINEGUN Overview

Estimated Study Time

1 hour, 45 minutes

Unit Scope

This study unit will discusses the characteristics, operation, maintenance, immediate action, care and cleaning techniques, and firing procedures for the MK19 machinegun (MK19).

Learning Objectives

After completing this unit, you should be able to

In This Study Unit

·

Identify the characteristics of the MK19.

·

Identify how to maintain the MK19.

·

Identify how to engage a target with the MK19.

·

Identify how to troubleshoot malfunctions and stoppages on the MK19.

This study unit contains the following lessons: Topic Lesson 1 Description Lesson 2 Clearing, Disassembling, and Cleaning Lesson 3 Assembling, Conducting the Function Check, and Mounts and Accessories Lesson 4 Sighting, Firing, Malfunctions, Stoppages, and Immediate Action

MCI Course 8017A

6-1

See Page 6-3 6-13 6-33 6-49

Study Unit 6

(This page left intentionally blank.)

MCI Course 8017A

6-2

Study Unit 6

LESSON 1 DESCRIPTION Introduction

Estimated Study Time

20 minutes

Lesson Scope

This lesson discusses the basic characteristics of the MK19 machinegun (MK19) and the ammunition it uses.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the capabilities of the MK19.

·

Identify the cycle of operation for the MK19.

·

Identify the standard types of ammunition for the MK19 based on use.

This lesson contains the following topics: Topic Introduction Role and Capabilities General Characteristics Cycle of Operation Ammunition Lesson 1 Exercise

MCI Course 8017A

6-3

See Page 6-3 6-4 6-5 6-7 6-8 6-10

Study Unit 6, Lesson 1

Role and Capabilities

Role

The MK19 provides a high volume of fire that is effective against lightly armored vehicles, structures, and personnel.

Capabilities

The capabilities of the MK19 are to · · · · · ·

MCI Course 8017A

Support the infantry in the attack or defense Provide a heavy volume of destructive/suppressive fire Provide fires for the final protective fire (FPF) Provide protection for motorized movement Destroy lightly armored vehicles Perform reconnaissance by fire

6-4

Study Unit 6, Lesson 1

General Characteristics

Appearance

Below is a picture of the MK19 mounted on a tripod.

Weight

The approximate weight of the MK19 is 75.6 pounds.

Length

The length of the MK19 is 43.1 inches.

Range

The following table lists the range (in meters) for the MK19. Type of Range Maximum Maximum effective-area target Maximum effective-point target Minimum safe distance-training Minimum safe distance combat

Rates of Fire

Distance in Meters 2,212 2,212 1,500 310 75

The following table lists the rate of fire (in rounds per minute) for the MK19. Rate

Rounds per Minute 40 60 325-375

Sustained Rapid Cyclic

Muzzle Velocity The muzzle velocity of the MK19 is 790 feet per second. Continued on next page MCI Course 8017A

6-5

Study Unit 6, Lesson 1

General Characteristics, Continued

Three Descriptive The MK19 is Characteristics

MCI Course 8017A

·

Belt-fed. When the rounds of ammunition are linked together, they form a belt. During firing, the links disengage but remain on the cartridge case. Feeding is continuous throughout the cycle.

·

Air-cooled. The MK19 is an air-cooled weapon. No special cooling measures are required. Air circulation at normal outside air temperatures provides adequate cooling in any climate.

·

Blowback-operated. This term is used for weapons that are directly operated by the exploding propellant charge.

6-6

Study Unit 6, Lesson 1

Cycle of Operation

Operation

The cycle of operation for the MK19 consists of steps shown in the table below: Step 1

2 3 4 5 6 7 8

MCI Course 8017A

Action Feeding: When the bolt moves forward it forces the pawls of the feed slide assembly to position a new round in the feeder. As the bolt moves to the rear it forces the round from the feeder into the extractors and in position to chamber. Chambering: The bolt moves forward on the rail and seats the round in the chamber. Locking: Locking takes place when the bolt reaches the forwardmost position by the recoil springs and held in place by spring tension and the weight of the bolt. Firing: As locking occurs, the cocking lever is moved to the rear and allows the firing pin mechanism to release into the primer of the round. Unlocking: As the round fires the pressure from the gas overcomes the tension of the spring, and moves the bolt to the rear. Extracting: The rearward movement of the bolt along the rails pulls the casing out of the chamber. Ejecting: The vertical cam forces a new round into position and ejects the spent casing out through the ejection port. Cocking: Simultaneously with ejection, the cocking lever is moved forward, cocking the firing pin.

6-7

Study Unit 6, Lesson 1

Ammunition

Types

The MK19 fires 40mm ammunition. Each type is designed for a specific situation or mission. The table below shows the name, type, and characteristics of each round. Name M383/M384

Type High explosive, antipersonnel (HE)

M430

High explosive, dual purpose (HEDP)

M918/M385

M922

Characteristics · Point detonating · Inflicts personnel casualties with ground burst · Casualty radius - 15 meters

· Standard round for MK 19 · Impact detonating · Used against lightly armored vehicles, fortifications and personnel · Casualty producing radius - 15 meters Practice · Solid aluminum projectile Note: The M385 round · Simulates explosion is inert and has no blast upon impact effect in the target area. · Used in range gunnery practice

Dummy

· Completely inert · Used in training · Green with gold ogive and black markings

Continued on next page MCI Course 8017A

6-8

Study Unit 6, Lesson 1

Ammunition, Continued

Characteristics

The pictures below show the internal components of the round.

Important

The 40mm ammunition used with the MK19 cannot be used in the M203 grenade launcher.

MCI Course 8017A

6-9

Study Unit 6, Lesson 1

Lesson 1 Exercise

Estimated Study Time

5 minutes

Directions

Complete exercise items 1 through 3 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

You are part of a perimeter defense with your MK19. Which of the following is a capability that can be accomplished using the MK19? a. b. c. d.

Item 2

Complete the cycle of operation of the MK19 in sequence, feeding, chambering, locking, __________, __________, __________, __________, and cocking. a. b. c. d.

Item 3

Destroy enemy tanks Provide anti-aircraft fire Provide fires for the FPF Supplement mortar fires using indirect fire

firing, unlocking, ejecting, extracting firing, unlocking, extracting, ejecting firing, extracting, unlocking, ejecting firing, releasing, extracting, ejecting

Which of the following 40mm ammunition is the practice round used with the MK19? a. b. c. d.

M383 M384 M385 M430 Continued on next page

MCI Course 8017A

6-10

Study Unit 6, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer c b c

6-11

Reference Page 6-4 6-7 6-8

Study Unit 6, Lesson 1 Exercise

(This page intentionally left blank.)

MCI Course 8017A

6-12

Study Unit 6, Lesson 1 Exercise

LESSON 2 CLEARING, DISASSEMBLING, AND CLEANING Introduction

Estimated Study Time

20 minutes

Lesson Scope

The objective of this lesson discusses how to clear, disassemble, and clean the MK19 machinegun (MK19).

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the steps to clear the MK19.

·

Identify the steps to disassemble the MK19.

·

Identify steps for the care and cleaning of the MK19.

This lesson contains the following topics: Topic Introduction Clearing Components Disassembling Care and Cleaning Lesson 2 Exercise

MCI Course 8017A

6-13

See Page 6-13 6-14 6-17 6-18 6-27 6-30

Study Unit 6, Lesson 2

Clearing

Procedure

Before you begin to disassemble any weapon, you must first clear it. The following table lists the steps for clearing the MK19. Step 1 2

3

Action Point the gun in a safe direction. Place the fire/safe switch on the S position as shown in picture below.

Open the top cover assembly as shown in picture below.

Continued on next page

MCI Course 8017A

6-14

Study Unit 6, Lesson 2

Clearing, Continued

Procedure, continued

Step 4

Action If ammunition is loaded in the gun, reach beneath the feeder and press the primary and secondary positioning pawls as shown in the picture below. At the same time, slide the linked rounds out of the feeder and feed tray.

5

If a round is on the face of the bolt, insert a section of the cleaning rod through either side of the receiver rail.

6

· Place it on top of the live round or cartridge case as close to the bolt face as possible. · Push down to force the round out through the bottom. Lower and pull the charger handles to the rear as shown below.

Continued on next page

MCI Course 8017A

6-15

Study Unit 6, Lesson 2

Clearing, Continued

Procedure, continued

Step 7 8

9

MCI Course 8017A

Action Inspect the chamber and bolt face again to ensure that no live rounds are in the weapon. Place the safety switch on Fire (F).

Press the trigger and ease the bolt forward. Return the charger handles to their original position.

6-16

Study Unit 6, Lesson 2

Components

Components

MCI Course 8017A

After you clear the MK19, you are ready to disassemble it. The MK19 machinegun can be disassembled into the major components as shown in the illustration below.

6-17

Study Unit 6, Lesson 2

Disassembling

Procedure

After you have cleared your MK19, you are ready to disassemble the machinegun by removing the following: · · · · · · · ·

Removing the Secondary Drive Lever

Secondary drive lever Top cover assembly Feed slide assembly and feed tray Bolt and backplate assembly Primary drive lever and vertical cam assembly Sear assembly Alignment guide assembly and ogive plunger Round positioning block and charger assemblies

The secondary drive lever can be removed by following the steps in the table below. Step 1

2 3

Action Raise the cover and push down on the pivot post from the outside of the cover assembly as shown in the picture below.

Separate the secondary drive lever from the top cover assembly. Remove the secondary drive lever from slide assembly. Continued on next page

MCI Course 8017A

6-18

Study Unit 6, Lesson 2

Disassembling, Continued

Removing the Top Cover Assembly

The top cover assembly can be removed by following the steps in the table below. Step 1

2 3

Action Hold the top cover straight up with one hand and pull the top cover pins from both sides as shown below.

Pull the top cover pins from both sides of the cover assembly as shown above. Lift the top cover assembly straight up and off. Continued on next page

MCI Course 8017A

6-19

Study Unit 6, Lesson 2

Disassembling, Continued

Removing the Feed Slide Assembly and Feed Tray

The feed slide assembly and feed tray can be removed by following the steps in the table below.

Step 1

2

Action Align the tabs on the feed slide assembly with the slots in the feed tray and lift them straight up as shown below.

Lift the feed tray straight up as shown below.

Continued on next page

MCI Course 8017A

6-20

Study Unit 6, Lesson 2

Disassembling, Continued

Removing the Bolt and Backplate Assembly

The bolt and backplate assembly can be removed by following the steps in the table below.

Step 1

2 3

Action Take out the backplate pin using the rim of a spent cartridge case or metal link as shown below.

Note: Ensure that the safety switch is in the fire position. Grasp the control grips with both hands and lift up slightly to disengage the backplate from the locking lugs in the receiver. Pull the bolt and backplate assembly to the rear as shown below.

Continued on next page

MCI Course 8017A

6-21

Study Unit 6, Lesson 2

Disassembling, Continued

Removing the Primary Drive Lever and the Vertical Cam Assembly

The primary drive lever and vertical cam can be removed by following the steps in the table below. Step 1

Action Reach under the top of the receiver to locate the drive lever lock on the vertical cam assembly. Slide the lock to the rear about 1/4 inch as shown in the picture below.

2

Press down on the primary drive lever pivot post. (This releases the primary drive lever and the vertical cam assembly)

3

Pull the primary drive lever and the vertical cam assembly out of the receiver. Continued on next page

MCI Course 8017A

6-22

Study Unit 6, Lesson 2

Disassembling, Continued

Removing the Sear Assembly

The sear assembly can be removed by following the steps in the table below. Step 1 2

Action Turn the receiver on its side or upside down. Lift the lock pin with a cartridge link or with your hand as shown in the picture below.

3

Press the receiver sear (underneath the safety), and rotate the sear housing assembly 90 degrees in either direction. Place the safety switch in the safe position. Keep pressure on the sear and lift the sear assembly off the weapon.

4 5

Note: If the fire/safe switch is on the fire (F) position when you remove the sear housing assembly, parts from the sear housing assembly can fall out and become lost. Continued on next page

MCI Course 8017A

6-23

Study Unit 6, Lesson 2

Disassembling, Continued

Removing the The alignment guide assembly and ogive plunger can be removed by Alignment Guide following the steps in the table below: Assembly and the Ogive Plunger

Step 1

Action Depress the alignment guide spring by inserting a cartridge link or small tool into the slot in the feeder mouth.

2

Slide the alignment guide towards the feeder mouth, pulling the assembly slightly rearward. Pull the ogive plunger assembly out through the inside wall of the receiver as shown in the picture below.

3

Continued on next page

MCI Course 8017A

6-24

Study Unit 6, Lesson 2

Disassembling, Continued

Removing Round Positioning Block and Charger Assemblies

The table below lists the steps to remove the round positioning block and the charger assemblies.

Step 1

2

Action Depress the round positioning block and slide it towards the muzzle end of the gun as shown in the picture below.

Pull the round positioning block away from the wall of the receiver. Continued on next page

MCI Course 8017A

6-25

Study Unit 6, Lesson 2

Disassembling, Continued

Removing Round Positioning Block and Charger Assemblies, continued

Step 3 4

5 6

Action Place the charger assemblies in the upright position. Using a metal link or spent cartridge case, retract the locking plunger at the base of the charging arm.

Slide the charger housing rearward to disengage the lugs from the key slots in the receiver as shown above. Lift the charger assembly away from the receiver. Continued on next page

MCI Course 8017A

6-26

Study Unit 6, Lesson 2

Care and Cleaning

When to Clean

Care and cleaning consists of three actions: cleaning, inspecting, and lubricating. You need to conduct care and cleaning on a regular basis. · · · ·

Cleaning and Lubricating Materials

After firing. At least daily under combat/field conditions. Weekly when the gun is in storage. Three consecutive days upon returning from the field.

The table below describes the five types of cleaning and lubricating materials that you can use on the MK19. Cleaner/Lubricant Lubricant, weapons, semi-fluid (LSAT) Cleaner, lubricant, preservative (CLP)

Lubricant, arctic weather (LAW) Rifle bore cleaner (RBC) Dry cleaning solvent (P-D-680)

Use Lubricates the weapon. Note: This is the preferred material for lubricating the MK19. Cleans, lubricates, and preserves the weapon. Note: CLP is used as a lubricant only if LSAT is not available. Lubricates the weapon in extremely cold weather (below 0o Fahrenheit). Cleans the bore and the chamber. Cleans the weapon. Continued on next page

MCI Course 8017A

6-27

Study Unit 6, Lesson 2

Care and Cleaning, Continued

Cleaning

The table below lists the steps to clean the MK19. Step 1 2 3 4

Action Disassemble the weapon into its components. Inspect all parts for cracks, burrs, wear, and rust. Clean the bore and chamber with RBC or CLP. Immerse the parts in drycleaning solvent or apply drycleaning solvent to a rag or brush and scrub the parts. CAUTION:

5 Inspecting

Do not immerse the sear housing assembly, backplate, ogive plunger and the bolt assembly in solvent. Solvent can dilute the lubricant and grease in these parts. Lubricate and then reassemble the weapon.

Inspections are usually conducted in conjunction with cleaning. The table below lists the steps to inspect the MK19. Step 1 2 3 4 5 6 7 8

Action Disassemble the weapon into its components. Inspect the barrel for carbon buildup in the bore or chamber. Inspect all parts for cracks, wear, burrs, and rust. Inspect all pins to be sure they are not loose or missing. Inspect all springs for weak spring action. Inspect all moving parts for binding. Reassemble the weapon. Inspect the mount, spare parts, and tools. Continued on next page

MCI Course 8017A

6-28

Study Unit 6, Lesson 2

Care and Cleaning, Continued

Lubricating

The MK19 must be lubricated to reduce wear and to prevent rust and malfunctions. The table below lists the steps to lubricate the MK19. Step 1 2

Extreme Environments

Action Apply a light coat of lubricant to all parts. The table below lists the authorized lubricates for use. Apply several drops of lubricant to moving parts (feeder pawls, pivot posts and latch mechanism) and work the parts to spread the lubricant.

In extreme environments, you must take extra precautions to be sure your MK19 operates trouble-free. The following table shows the precautions you must take for each environmental condition. Environment Hot, humid climate

· · ·

Hot, dry, and sandy climate

· · ·

Cold climates

· · · ·

MCI Course 8017A

6-29

Precautions Inspect the weapon frequently for rust. Keep the weapon as moisture-free as possible. Field-strip, clean, and lubricate the weapon more often. Use a generous coat of lubricant. Clean and lubricate daily. Wipe the weapon dry. Do not use extra lubricant because the grit and dust will stick to the parts. Cover the weapon when not in use. Cover the weapon when outside. Keep the weapon free of excess lubrication and moisture. If the metal sweats, dry and lubricate the parts before taking the weapon outdoors again.

Study Unit 6, Lesson 2

Lesson 2 Exercise

Estimated Study Time

5 minutes

Directions

Complete exercise items 1 through 4 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

Which of the following is the first step in the procedure for clearing the MK19? a. b. c. d.

Item 2

The first item you remove to begin disassembling the MK19 is the a. b. c. d.

Item 3

top cover and feed tray. sear assembly. secondary drive lever. bolt and backplate assembly.

What is the preferred lubricant for the MK19 machinegun? a. b. c. d.

Item 4

Open the top cover assembly. Place the fire/safe switch on the S position. Inspect the chamber for ammunition. Point the gun in a safe direction.

LSAT CLP LAW RBC

How often do you conduct care and cleaning of the MK19 when it is in storage? a. b. c. d.

Daily Weekly Bi-weekly Monthly Continued on next page

MCI Course 8017A

6-30

Study Unit 6, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4

MCI Course 8017A

Answer d c a b

6-31

Reference Page 6-14 6-18 6-27 6-27

Study Unit 6, Lesson 2 Exercise

(This page intentionally left blank.)

MCI Course 8017A

6-32

Study Unit 6, Lesson 2 Exercise

LESSON 3 ASSEMBLING, CONDUCTING THE FUNCTION CHECK, AND MOUNTS AND ACCESSORIES Introduction

Estimated Study Time

20 minutes

Lesson Scope

This lesson discuses how to assemble, perform a function check, and mount the MK19 machinegun (MK19).

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the steps to assemble the MK19.

·

Identify the steps to perform a function check on the MK19.

·

Identify the mounts and accessories for the MK19.

This lesson contains the following topics: Topic Introduction Assembling Performing a Function Check Mounts and Accessories Lesson 3 Exercise

MCI Course 8017A

6-33

See Page 6-33 6-34 6-43 6-44 6-47

Study Unit 6, Lesson 3

Assembling Procedure

After you have cleaned and inspected your MK19, you are ready to begin assembly. To assemble the MK19, replace the parts in the reverse order of disassembly by attaching the · · · · · · · ·

Charger and round positioning block assemblies Ogive plunger and the alignment guide assembly Sear assembly Vertical cam assembly and the primary drive lever Bolt and backplate assembly Feed tray and the feed slide assembly Top cover assembly Secondary drive lever Continued on next page

MCI Course 8017A

6-34

Study Unit 6, Lesson 3

Assembling, Continued

Attaching the Charger and Round Positioning Block Assemblies

The table below lists the steps to attach the charger and round positioning block assemblies to the MK19.

Step 1 2

Action Rotate the charger handle to the up position. Line up the lugs on the charger with the slots in the receiver rail.

3 4 5

Insert the charger lugs into the slots. Hold the charger tightly against the rail. Slide the charger forward until it locks in place.

6 7

Insert the round positioning block into the slots in the receiver. Push against the block and slide it toward the rear until it locks in place. Continued on next page

MCI Course 8017A

6-35

Study Unit 6, Lesson 3

Assembling, Continued

Attaching the Ogive Plunger and Alignment Guide Assembly

The table below lists the steps to attach the ogive plunger and the alignment guide assembly to the MK19 machinegun. Step 1

Action Insert the ogive plunger into the feeder wall.

2

Position the alignment guide assembly so that the pin is lined up with the slot in the feeder wall.

3 4

Depress the leaf spring. Slide the alignment guide toward the ogive plunger until you hear a click. Continued on next page

MCI Course 8017A

6-36

Study Unit 6, Lesson 3

Assembling, Continued Attaching the Sear Assembly

The table below lists the steps to attach the sear assembly Step Action 1 Turn the receiver upside down. 2 Place the sear on the receiver and squeeze the sear lock and rotate the assembly 90 degrees to the right or left until it locks in place.

Continued on next page

MCI Course 8017A

6-37

Study Unit 6, Lesson 3

Assembling, Continued

Attaching the Vertical Cam Assembly and the Primary Drive Lever

Attaching the Charger and Round Positioning Block Assemblies. The table below lists the steps to attach the charger and round positioning block assemblies to the MK19.

Step 1

2 3 4 5

Action Slide the vertical cam assembly through the rear of the receiver. The raised portion slides over the hole in the receiver. The drive lever lock is underneath.

Engage the forked end in the notch in the receiver. Hold the vertical cam assembly in place while you slide the primary drive lever into the receiver. Engage the pivot post of the lever through the holes in the receiver and the vertical cam. Slide the drive lever lock on the vertical cam forward. Continued on next page

MCI Course 8017A

6-38

Study Unit 6, Lesson 3

Assembling, Continued

Attaching the Bolt and Backplate Assembly

The table below lists the steps to attach the bolt and backplate assembly to the MK19.

Step 1

Action Note: Be sure the cocking lever is cocked and forward.

2

Place the fire/safe switch in the F position. Insert the bolt and backplate assembly into the receiver.

3

When the bolt and backplate assembly stops, press the receiver sear and slide the bolt and backplate assembly all the way forward. WARNING: Watch your thumbs!

4

Insert the backplate pin to lock the assembly in place.

Continued on next page MCI Course 8017A

6-39

Study Unit 6, Lesson 3

Assembling, Continued

Attaching the Feed Tray and the Feed Slide Assembly

The table below lists the steps to attach the feed tray and the feed slide assembly to the MK19.

Step 1

2 3 4 5

Action Drop the feed tray into the top of the feeder, recessed side up. The pinholes on the tray line up with the lugs on the receiver.

Position the feed slide assembly so that the tabs are lined up with the slots in the tray. Insert the tabs into the slots. Slide the feed slide assembly to the right side of the feed tray. Line up the pinholes in the feed tray and in the top cover, and the receiver lugs. Hold the top cover straight up. Insert the top cover pins on both sides. Be sure the crosspin enters the receiver. Continued on next page

MCI Course 8017A

6-40

Study Unit 6, Lesson 3

Assembling, Continued

Attaching the Top Cover Assembly

Hold the top cover straight up with one hand and install the top cover pins from both sides as shown in diagram below.

Attaching the Secondary Drive Lever

The table below lists the steps to attach the secondary drive lever to the MK19. Step 1 2

3 4

Action Lift the feed slide assembly and tray. Engage the forked end of the secondary drive lever with the feed slide pin.

Press the raised pivot post through the hole in the top cover. Press the tray firmly against the top cover. WARNING:

If the secondary drive lever is not properly engaged with the feed slide pin, the gun will not fire and can be dangerous. Continued on next page

MCI Course 8017A

6-41

Study Unit 6, Lesson 3

Assembling, Continued

After-Assembly Check

After assembling the MK19, conduct a check to ensure proper assembly. The table below lists the steps to conduct an after-assembly check. Step 1 2 3 4 5

MCI Course 8017A

Action Be sure the secondary drive lever is properly engaged with the feed slide pin. Be sure the feed slide assembly is all the way to the left. Be sure the bolt is forward and the charger handles are up. Close the top cover. Be sure the top cover pins are flush.

6-42

Study Unit 6, Lesson 3

Performing a Function Check

Purpose

You should conduct a function check immediately after assembly and before preparing to fire. Before conducting a function check, be sure the · · ·

Procedure

Secondary drive lever is properly engaged with the feed slide pin. Feed slide assembly is all the way to the left. Bolt is forward.

The table below lists the steps to perform a function check. Step 1

2 3 4

Action Charge the gun. If the bolt jams midway · Hold the bolt back while opening the top cover. · Slowly ride the bolt forward. · Close the top cover and charge again. Place the fire/safe switch on S and depress the trigger. (Nothing should happen.) Place the fire/safe switch on F and depress the trigger. (You should hear a click.) Open the top cover assembly and be sure the firing pin is forward. If it is not · · ·

MCI Course 8017A

Remove the bolt and backplate assembly. Be sure the cocking lever is forward. Replace the bolt and backplate assembly.

6-43

Study Unit 6, Lesson 3

Mounts and Accessories

Mounts

The following mounts are used with the MK19 · ·

M3 tripod mount Vehicle mount

Accessories

The MK19 must be mounted to fire. Along with one of the mounts listed above, you need the accessories listed in the blocks below. These include the MK 64 cradle, a traversing and elevating mechanism, and a pintle. To aid in night firing, you may need to use a night vision sight. There is also a feed throat that can be attached to guide ammunition into the feeder.

MK64 Cradle

The MK64 gun cradle, shown in the picture below, is used to support the MK19. The cradle permits mounting on the M3 tripod and vehicle mounts. The T&E mechanism is attached to the cradle to permit accurate delivery of fire.

Procedures to Mount the MK64 Cradle

To mount the MK19 on the gun cradle

T&E Mechanism

The MK19 uses the same mounts (M3 tripod, M4 pedestal, M66 ring, HMMWV weapons station) and the same T&E mechanism as the M2HB .50caliber heavy machinegun.

· · ·

Remove the retaining pin. Place the gun in the cradle. Reinsert the retaining pins.

Continued on next page MCI Course 8017A

6-44

Study Unit 6, Lesson 3

Mounts and Accessories, Continued

Pintle Adapter

The pintle adapter is needed to mount the MK19 to the mounting well of a HMMWV weapons platform and M3A2 ring mount with the M66 ring. A picture of the adapter is shown below:

Continued on next page

MCI Course 8017A

6-45

Study Unit 6, Lesson 3

Mounts and Accessories, Continued

AN/TVS-5 Night Vision Sight

Night vision sight can be installed on the MK19 for passive night observation and fire. Portable and battery operated, the AN/TVS-5 amplifies natural light such as moonlight, starlight, and skyglow. AN/TVS-5 does not emit visible or infrared light that could be detected by the enemy.

Feed Throat

The MK19 has a feed throat that can be attached to the weapon to guide the ammunition belt into the feeder. The table below lists the steps to attach the feed throat to the MK19 machinegun. Step 1

2

MCI Course 8017A

Action Squeeze the spring-loaded pins on the feed throat as shown in the picture below.

Insert the feed throat into the slots on both sides of the feeder.

6-46

Study Unit 6, Lesson 3

Lesson 3 Exercise

Estimated Study Time

5 minutes

Directions

Complete exercise items 1 through 3 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

What is the next step in assembling the MK19 after attaching the top cover assembly? a. b. c. d.

Item 2

While performing a function check on the MK19, the operator depresses the trigger with the fire/safe switch in the F position. What should happen? a. b. c. d.

Item 3

Attach the secondary drive lever Attach the feed tray and the top cover assembly Attach the sear assembly Attach the ogive plunger and the alignment guide assembly

Nothing. A click should be heard. The bolt should slam forward. A round should eject.

Which of the following night vision sights can be installed on the MK19 to aid in night observation and fire? a. b. c. d.

AN/PVS-4 night vision sight AN/PVS-5 night vision goggle AN/TVS-4 night vision sight AN/TVS-5 night vision sight Continued on next page

MCI Course 8017A

6-47

Study Unit 6, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer` a b d

6-48

Reference Page 6-41 6-43 6-46

Study Unit 6, Lesson 3 Exercise

LESSON 4 SIGHTING, FIRING, MALFUNCTIONS, STOPPAGES, AND IMMEDIATE ACTION Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson discusses how to set the sights, fire, handle malfunctions and stoppages, and apply immediate action for the MK19 machinegun (MK19).

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the parts of the sights on the MK19.

·

Identify the steps to prepare the MK19 to engage a target.

·

Identify the malfunctions on the MK19.

·

Identify stoppages on the MK19.

·

Identify the steps for applying immediate action to reduce a stoppage on the MK19.

This lesson contains the following topic: Topic Introduction Sights Before Firing Firing Malfunctions Stoppages Immediate Action Lesson 4 Exercise

MCI Course 8017A

6-49

See Page 6-49 6-50 6-52 6-55 6-56 6-57 6-58 6-59

Study Unit 6, Lesson 4

Sights

Introduction

The MK40 sight, is the rear sight assembly on the MK19. The sight is a ladder type design with graduated range indications from 300-1,500 meters. The strengthening rib on the gun’s top cover is used as the front sight blade.

Front Sight

The front sight is a raised ridge on the top cover assembly, as shown in the illustrated below:

Continued on next page

MCI Course 8017A

6-50

Study Unit 6, Lesson 4

Sights, Continued

MK40 Parts

The illustration below lists the parts of the sight assembly for the MK19.

Function

The table below lists the function of the parts located on the front sight assembly. Part Plunger Retainer lock nut Sight frame Elevation wheel Aperture carrier Windage screw Battlesight

MCI Course 8017A

Function Releases the sight frame Locks the aperture carrier in place Contains the graduated range indications Adjusts the degrees of elevation Sets the elevation Adjusts the windage Sight used with sight assembly folded down to engage targets with in battlesight range.

6-51

Study Unit 6, Lesson 4

Before Firing

Prepare Sights

When the rear sight frame is down, use the battlesight to engage snap targets. The table below lists the steps to sight in on a target with the rear sight frame up. Step 1 2 3

Prepare Weapon

Action Estimate the range to the target. Push in on the lock nut and move the aperture carrier up or down to the range indication that corresponds to your estimated range. Adjust the T&E mechanism to obtain a sight picture on the target.

To engage targets with the MK19, you must · · · ·

Feed the ammunition into the weapon Charge the weapon Load the first round Aim and fire Continued on next page

MCI Course 8017A

6-52

Study Unit 6, Lesson 4

Before Firing, Continued

Feeding the Ammunition

The following table lists the steps to feed ammunition into the MK19. Step 1 2

Action Clear the MK19. Insert the first round, female link first, into the feeder as shown in the picture below.

3

Push the round across the first pawl as shown in the picture below until you hear a click.

4

Move the secondary drive lever (inside the top cover) to the left.

5

Close the top cover. Continued on next page

MCI Course 8017A

6-53

Study Unit 6, Lesson 4

Before Firing, Continued

Charging

After feeding, charging the gun manually moves the round into position to be fired. The table below lists the steps to charge the MK19. Step 1 2

3 4

Action Grasp the charger handles (1). Press the charger handle locks (2), as shown in the picture below, and rotate the handles down.

Pull the chargers to the rear. Return the charger handles forward and rotate them up to the locked position. CAUTION: Be sure the top cover is closed before charging.

Loading the First Round

The table below lists the steps to load the first round onto the face of the bolt. Step 1 2 3 4

MCI Course 8017A

Action Place the fire/safe switch on the F position. Press the trigger, allowing the bolt to slam forward. Charge the gun again. Return the fire/safe switch to the S position. The gun is now loaded, charged, and ready to fire.

6-54

Study Unit 6, Lesson 4

Firing

Firing

The table below lists the steps to fire the MK19. Step 1 2 3

Zeroing

Action Place the fire/safe switch on the F position. (Be sure the charger handles are forward and up.) Place your hands on the control grips with your thumbs on the trigger. Press the trigger to fire. (Fire in three- to five-round bursts.)

The table below lists the steps to zero the MK19. Step 1 2 3 4 5

Action Locate a target at a known distance. (Recommended distance is 400 - 600 meters) Adjust the rear sight setting to the range to the target. Center the windage scale by turning the windage screw until the center index lines are aligned. Adjust the T&E mechanism until the correct sight picture is obtained at the base of the target. Fire a single round and observe the impact. If the round ·

6

7 8

Impacts within five meters of the target, fire another round to confirm zero. If this round impacts within five meters of the target, your MK19 is zeroed.

· Is not within five meters of the target, go to step 6. Adjust the windage screw and elevation wheel on the sight to obtain a sight picture on the impact. Note: Do not move the gun. Move the sight. Adjust the T&E mechanism to regain the correct sight picture on the target. Go back to step 5. Note: Repeat steps 5-8 until your MK19 is zeroed.

MCI Course 8017A

6-55

Study Unit 6, Lesson 4

Malfunctions Introduction

Malfunctions and stoppages can occur any time you are firing the MK19. You must be able to identify and correct the problem quickly and continue your mission.

Malfunction Defined

A malfunction is a failure of the weapon to function properly not due to defective ammunition or operational error by the gunner.

Common Malfunctions

The table below lists the most common types of malfunctions, their causes, and the corrective action to take. Malfunction Sluggish Action

Runaway Gun

· · · · · ·

Cause Friction from dirt Carbon buildup Lack of lubrication Burred parts Worn parts Short recoil of the bolt assembly

· · · · ·

Corrective Action Clean Lubricate Tighten or replace parts

Keep rounds on target, until all rounds on the belt have been fired. Presses the charger handle locks and lower one charger handle.

Note: Do not try to break the ammunition belt.

MCI Course 8017A

6-56

Study Unit 6, Lesson 4

Stoppages

Stoppages

A stoppage is any interruption in the cycle of operation caused by faulty action of the gun or defective ammunition.

Common Stoppages

The table below lists the most common types of stoppages, their causes, and the corrective action to take.

MCI Course 8017A

Stoppage Failure to feed · · ·

Cause Rounds not lined up · Male end of link is first · Broken links ·

Failure to fire

Defective ammunition Defective parts in the firing mechanism

· ·

6-57

· ·

Corrective action Align the rounds. Replace the rounds. Place the female link first. Replace with new linked rounds. Replace with new ammunition. Inspect the parts and replace worn, burred, or broken parts.

Study Unit 6, Lesson 4

Immediate Action

Definition

Immediate action is the action taken to reduce a stoppage without investigating the cause.

Procedure

The table below lists the steps to perform immediate action. Step 1 2 3 4

5 6

Training Action Shout “Misfire.” Clear the area of nonessential personnel. Wait 10 seconds for possible hangfire. Pull the bolt to rear and observe for feeding and ejecting. Note: Catch round as it ejects. Push charger handles forward and up. Observe for feeding and ejecting. Takes Place · Go to step 7

7

Combat Action Press charger handle locks and rotate charger handles down. Pull and lock the bolt to the rear. Push the charger handles forward and lock them in the up position. Relay gun on target and attempt to fire. (Same) (Same)

Does Not · Unload and clear · Troubleshoot

Attempt to fire.

(Same)

Note: If the weapon does not fire, wait 10 seconds, clear, and troubleshoot.

MCI Course 8017A

6-58

Study Unit 6, Lesson 4

Lesson 4 Exercise

Estimated Study Time

5 minutes

Directions

Complete exercise items 1 through 5 by performing the action required. Check your answers against those listed at the end of this lesson.

Item 1

Which of the parts below contain the graduated sight indications scale on the MK40 sight? a. b. c. d.

Item 2

What is the first step to preparing the MK19 for firing? a. b. c. d.

Item 3

Loading the first round onto the face of the bolt Charging Function check Feeding

Which of the following is the corrective action if you have a runaway gun with the MK19? a. b. c. d.

Item 4

Sight frame Elevation wheel Aperture carrier Elevation screw

Break the belt. Let it fire until the ammunition is expended. Open the top cover. Place the fire/safe switch in the S position.

Which of the following is a cause of a failure to fire on a MK19? a. b. c. d.

Defective parts in the firing mechanism Rounds not lined up straight Male end of link is first Broken links Continued on next page

MCI Course 8017A

6-59

Study Unit 6, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Item 5

After observing feeding and ejecting while performing immediate action on the MK19, a round is ejected. What is the next step the gunner performs? a. b. c. d.

Wait 10 seconds and clear machinegun. Unload and clear machinegun. Attempt to fire machinegun. Troubleshoot the machinegun. Continued on next page

MCI Course 8017A

6-60

Study Unit 6, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5

MCI Course 8017A

Answer a d b a c

6-61

Reference Page 6-51 6-52 6-56 6-57 6-58

Study Unit 6, Lesson 4 Exercise

(This page intentionally left blank.)

MCI Course 8017A

6-62

Study Unit 6, Lesson 4 Exercise

STUDY UNIT 7 TRAVERSING AND ELEVATING MECHANISM Overview

Estimated Study Time

45 minutes

Scope

This study unit covers the traversing and elevating (T&E) mechanism and its use and operation.

Learning Objectives

After completing this study unit, you should be able to

In This Study Unit

·

Identify the characteristics of the T&E mechanism.

·

Identify the procedures for operating T&E mechanism.

This study unit contains the following lessons: Topic Lesson 1 Characteristics Lesson 2 Operation

MCI Course 8017A

7-1

See Page 7-3 7-9

Study Unit 7

(This page intentionally left blank.)

MCI Course 8017A

7-2

Study Unit 7

LESSON 1 CHARACTERISTICS Introduction

Estimated Study Time

15 minutes

Lesson Scope

This lesson will describe the use and components of the T&E mechanism. Note:

Learning Objectives

In This Lesson

The information in this lesson applies to using the T&E mechanism on all the machineguns discussed in this course.

After completing this lesson, you should be able to ·

Describe the purpose of the T&E mechanism.

·

Identify the parts of the T&E mechanism by function.

This lesson contains the following topics: Topic Introduction Function Components Lesson 1 Exercise

MCI Course 8017A

7-3

See Page 7-3 7-4 7-5 7-6

Study Unit 7, Lesson 1

Function

Capabilities

When properly employed, the traversing and elevating (T&E) mechanism enables you to ·

Lock the gun into a desired position which allows you to accurately engage predetermined targets during periods of reduced visibility

·

Obtain direction and elevation readings from the traversing bar and T&E mechanism and record the readings on your range card. This allows you to · · ·

MCI Course 8017A

Fire from defilade positions. Engage enemy positions on reverse slopes. Quickly and accurately shift to predetermined targets.

7-4

Study Unit 7, Lesson 1

Components

Parts List

The T&E mechanism consists of · · · · ·

Two elevating screws · Lower · Upper Upper elevating screw yoke Traversing slide lock lever Traversing mechanism scale Two handwheels Traversing (adjusts direction left and right) Elevating (adjusts height up and down)

Note: All readings are recorded in mils (unit of measurement)

MCI Course 8017A

7-5

Study Unit 7, Lesson 1

Lesson 1 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 3. Check your answers against those listed at the end of this lesson.

Item 1

Which of the following actions does the T&E mechanism enable you to accomplish? a. b. c. d.

Item 2

The T&E allows the gunner to a. b. c. d.

Item 3

Engage armored targets at oblique angles Fire from defilade positions Fire on the move Fire from unsupported positions

record the readings on a range card for later use. support the squad in the offense. engage enemy positions on the move. freely engage targets.

What part on the T&E locks itself to the traversing bar? a. b. c. d.

Elevating and traversing handwheels Upper elevating screw yoke and traversing bar Traversing slide lock lever Upper and lower elevating screws Continued on next page

MCI Course 8017A

7-6

Study Unit 7, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer b a c

7-7

Reference Page 7-4 7-4 7-5

Study Unit 7, Lesson 1 Exercise

(This page intentionally left blank.)

MCI Course 8017A

7-8

Study Unit 7, Lesson 1 Exercise

LESSON 2 OPERATION Introduction

Estimated Study Time

20 minutes

Lesson Scope

This lesson describes the operation of the T&E mechanism. Note: The information in this lesson applies to using the T&E mechanism on all the machineguns discussed in this course.

Learning Objectives

In This Lesson

After completing this lesson, you should be able to ·

Identify the procedure for initially positioning the traversing mechanism.

·

Identify where you lock the traversing bar to lay the machinegun for direction.

·

Identify the procedure for obtaining a direction reading from the T&E.

·

Identify the procedure for obtaining elevation reading from the T&E.

This lesson contains the following topics: Topic Introduction Initial Positioning of the T&E Mechanism Laying the Machinegun for Direction Direction Readings Elevation Readings Lesson 2 Exercise

MCI Course 8017A

7-9

See Page 7-9 7-10 7-11 7-12 7-14 7-16

Study Unit 7, Lesson 2

Initial Positioning of the T&E Mechanism Center the Traversing Mechanism

MCI Course 8017A

You must center the traversing mechanism before obtaining direction and elevation readings. The following table lists the steps for centering the traversing mechanism. Step 1

Action Turn the traversing handwheel (shown below) toward your body as far as it will go.

2 3

Turn it two complete revolutions (50 clicks) away from you. Check the handwheel to ensure the zero on the scale is lined up with the zero index line.

7-10

Study Unit 7, Lesson 2

Laying the Machinegun for Direction

Two Methods

After centering the traversing mechanism, you can lay the gun for direction. The two methods of laying the gun for direction depend on if a final protective line (FPL) has been assigned or has not been assigned.

Final Protective The following table lists the steps for laying the gun for direction if a final Line (FPL) protective line has been assigned. Assigned

Step 1 2

No Final Protective Line (FPL) Assigned

If an FPL has not been assigned, lay the gun on the center of your sector of fire. The following table lists the steps for laying the gun for direction if an FPL has not been assigned. Step 1

2

Emplace Tripod

Action Lock the traversing slide all the way to the end of the traversing bar opposite to the direction of the FPL. Lift the rear legs of the tripod and shift the tripod until the muzzle of the gun points along the FPL.

Action Lock the left edge of the traversing slide on the 0 graduation on the traversing bar. Note: The left edge of the traversing slide is always used as an index mark. Lift the rear legs of the tripod and shift the tripod until the muzzle of the gun is pointed to the center of your sector of fire.

After laying the gun, firmly emplace the tripod by · ·

Digging in the shoes Placing sandbags on the tripod legs

Note: If the tripod legs are moved, you must obtain new readings.

MCI Course 8017A

7-11

Study Unit 7, Lesson 2

Direction Readings

When to Obtain Readings

Obtain direction readings for all targets within your sector of fire except for the FPL. Note: The FPL needs no direction reading since the traversing slide is positioned all the way to the left or right of the traversing bar to fire.

Procedure

The following table lists the steps to obtain direction readings to targets. Step 1 2

3

Action Loosen the traversing slide lock lever. Slide the traversing slide along the traversing bar until the gun is laid on the center of a point target or on either flank of a linear target. Lock the traversing bar and read the direction reading from the scale on the traversing bar as shown in the figure below.

If the left edge of the traversing slide ·

Falls exactly on a 5 mil graduation (tickmark), that is your direction reading.

·

Does not fall exactly on a graduation, go to step 4. Continued on next page

MCI Course 8017A

7-12

Study Unit 7, Lesson 2

Direction Readings, Continued

Procedure, continued

Step 4 5 6 Example

Action Move the left edge of the traversing bar slide back to the next smaller graduation. Use the traversing handwheel to complete the initial lay and record the reading. Add the mil readings obtained from steps 4 and 5.

The gunner centers the gun on a point target and finds the left edge of the traversing bar slide falls between the 300 and 305 graduations on the traversing bar. The gunner next · · ·

Moves the left edge of the traversing bar slide back to the LEFT 300 graduations. Turns the traversing handwheel to return the muzzle of the gun to the center of the target (left 3 clicks). Adds the readings together. 300 + 3, you obtain a reading of 303 mils.

Note:

MCI Course 8017A

Since the gunner moved the muzzle of the gun to the right of center, this is a right reading. The direction reading is right 303 mils.

7-13

Study Unit 7, Lesson 2

Elevation Readings

Introduction

After obtaining a direction reading, the next step is to obtain an elevation reading. This reading is obtained from two scales.

Elevation Scales

The two scales used to obtain an elevation reading on the T&E are taken from the ·

Engraved scale on the upper elevating screw plate. It is graduated in 50mil increments from –200 mils to +200 mils. The index line below each number PLUS or MINUS sign above each number.

·

Engraved scale on the top of the elevating handwheel. It is graduated in 1-mil increments for a total of 50 mils.

Continued on next page

MCI Course 8017A

7-14

Study Unit 7, Lesson 2

Direction Readings, Continued Method For Obtaining Elevation Reading

The following table lists the steps to obtain the elevation reading.

Step 1 2 3 4 5

Example

Action Estimate the range to the target and place the range on the sight. Lay the gun on the center base of the target. Lower your head until your eyes are on line with the top of the elevating handwheel. The first part of the reading is the number and the plus (+) or (-) minus sign above the first visible index line. Locate the graduation on line with the indicator this is the second part of the number.

To place the elevation reading on the T&E, follow the steps in the table below. Step 1 2

Action Manipulate the elevating handwheel until the horizontal line is below the number needed at eye level. Turn the handwheel until the indicator shows the proper number.

An example reading is written as –50/3. Note:

MCI Course 8017A

An elevation reading is valid only on the T&E mechanism on which the reading was originally obtained.

7-15

Study Unit 7, Lesson 2

Lesson 2 E xercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 4. Check your answers against those listed at the end of this lesson.

Item 1

Which of the following are the first two steps of the procedure for initially positioning the traversing mechanism? a. Slide the traversing slide so that the left edge is lined up with the index line. b. Turn the traversing handwheel toward your body until the zero on the scale is lined up with the zero index line. c. Turn the traversing handwheel toward your body as far as it will go then turn it two complete revolutions away from you. d. Turn the traversing handwheel until the muzzle of your gun is centered in your primary sector of fire.

Item 2

You are laying your gun in a defensive position. Your platoon commander assigns you a final protective line (FPL) to your right, across the front of the platoon battle position. When laying your gun, where do you lock the traversing slide? a. b. c. d.

Lock the left edge on the zero graduation on the traversing bar. Lock the slide on the graduation that indicates the direction of the FPL. Leave the traversing slide unlocked. Lock the traversing slide all the way to the left on the traversing bar. Continued on next page

MCI Course 8017A

7-16

Study Unit 7, Lesson 2 Exercise

Lesson 2 E xercise, Continued

Item 3

You are obtaining a direction reading. You have laid the gun on the center of the target and locked the traversing slide. You look down on the traversing bar scale and see that the left edge of the traversing slide is between the 230 and 235 graduation. Which of the following is your next step? a. b. c. d.

Item 4

Move the left edge of the traversing slide to the 230 graduation. Move the left edge of the traversing slide to the 235 graduation. Turn the traversing handwheel until the muzzle of your gun is centered. Add the mil readings to obtain your direction reading.

Which of the following is a step for obtaining an elevation reading? a. b. c. d.

Align the elevating handwheel with the zero index line. Lay the gun on the center base of the target. Unlock the traverse slide mechanism. Place sandbags on the tripod legs. Continued on next page

MCI Course 8017A

7-17

Study Unit 7, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4

MCI Course 8017A

Answer c d a b

7-18

Reference Page 7-10 7-11 7-13 7-15

Study Unit 7, Lesson 2 Exercise

STUDY UNIT 8 THE M136, 84MM HEAT LAUNCHER AND HIGH EXPLOSIVE ANTI-TANK CARTRIDGE (AT-4) Overview

Estimated Study Time

2 hours, 40 minutes

Unit Scope

In this study unit, you will cover the characteristics, components, employment, and capabilities of the M136, 84mm HEAT launcher and the AT-4 anti-tank cartridge.

Learning Objectives

After completing this unit, you should be able to

In This Unit

·

Identify the main characteristics of the AT-4.

·

Identify the procedures for maintaining the AT-4.

·

Identify the techniques for using the AT-4.

This study unit contains the following lessons: Topic Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5

MCI Course 8017A

Description Operating Procedures Marksmanship Fundamentals Techniques of Fire and Range Determination Capabilities and Limitations

8-1

See Page 8-5 8-19 8-31 8-47 8-57

Study Unit 8

(This page intentionally left blank.)

MCI Course 8017A

8-2

Study Unit 8

LESSON 1 DESCRIPTION Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson discusses the mission and basic characteristics of the M136, 84mm high explosive anti-tank launcher (AT-4).

Learning Objectives

After completing this lesson, you should be able to ·

Identify the mission of the AT-4.

·

Identify the capabilities of the AT-4.

·

Identify the descriptive characteristics of the AT-4.

·

Identify three safety devices that must be disengaged before firing.

·

Identify the components of the AT-4 sights.

·

Identify proper packaging for the AT-4.

·

Identify markings for AT-4 packaging. Continued on next page

MCI Course 8017A

8-3

Study Unit 8, Lesson 1

Introduction, Continued

In This Lesson

This lesson contains the following topics: Topic Introduction General Characteristics Components Firing Mechanism Sights Packing Marking Lesson 1 Exercise

MCI Course 8017A

8-4

See Page 8-3 8-5 8-7 8-9 8-12 8-14 8-15 8-16

Study Unit 8, Lesson 1

General Characteristics

Mission

The AT-4, as shown below, is used primarily against armored personnel carriers; however, it can also be used against · · ·

Capabilities

Battle tanks when it is fired at the side or the rear Bunkers Field fortifications

The following table lists the capabilities of the AT-4. Capability Muzzle Velocity Maximum Range Maximum Effective Range Minimum Training Range Minimum Combat Range

Limits 290 meters per second (950 feet per second) 2,100 meters (6890 feet) 300 meters (985 feet) 30 meters (99 feet) 10 meters (33 feet) Continued on next page

MCI Course 8017A

8-5

Study Unit 8, Lesson 1

General Characteristics, Continued

Descriptive Characteristics

The descriptive characteristics of the AT-4 are listed below: ·

Lightweight. It is man-portable and is fired from the right shoulder.

·

Self-contained.

·

·

Free-flight, fin-stabilized cartridge packed in an expendable launcher.

· · ·

Issued as a round of ammunition. Requires minimum operator maintenance. The launcher serves as a watertight packing container for transportation and storage.

An anti-armor weapon. ·

Supplements other organic anti-armor weapons.

·

Provides anti-armor capability for the rifle squad and other units or installations that do not have organic anti-armor weapons. Can be used offensively by assault and support elements.

· Weight of Launcher

The AT-4 complete system weighs 14.8 pounds.

Technical Data

The following table lists data that applies to the AT-4. Dimension Weight of rocket Caliber of rocket Length of Launcher

MCI Course 8017A

Measurement 4 pounds 84 mm 40 inches

8-6

Study Unit 8, Lesson 1

Components

AT-4

The gunner must be able to identify the major components of the AT-4. The components are identified in the graphic below:

Transport Safety Pin

The transport safety pin provides for safe transportation. A lanyard attaches it to the AT-4.

Cocking Lever

The cocking lever cocks the firing mechanism.

Firethrough Muzzle Cover

The firethrough muzzle cover keeps out moisture and prevents foreign objects from entering the muzzle.

Color Code Band

The color code band indicates the type of cartridge. Continued on next page

MCI Course 8017A

8-7

Study Unit 8, Lesson 1

Components, Continued

Sights

Venturi

The AT-4 has two sights. ·

The rear sight consists of a sight blade, range setting knob, range indicator, 2mm peephole, and a 7mm peephole.

·

The front sight consists of a sight blade, a center post, and right and left lead posts.

The venturi: · ·

Protects the weapon from damage if it is dropped. Directs the flow of the backblast.

Forward Safety (Red Safety Catch)

The red safety catch must be fully depressed and held before pressing the trigger button or the AT-4 will not fire. It is also provided as a final safety measure.

Red Trigger Button

The red trigger button fires the weapon.

Shoulder Stop

The shoulder stop helps to stabilize the AT-4 on the shoulder.

Carrying Sling

The carrying sling provides a means for carrying the AT-4.

MCI Course 8017A

8-8

Study Unit 8, Lesson 1

Firing Mechanism

Components

The firing mechanism is comprised of the · Red trigger button · ·

Red Trigger Button

Enclosed firing rod with firing rod spring Three safety devices · Transport safety pin · Cocking lever · Forward safety

The red trigger button is located between the cocking lever and forward safety as shown below.

Note: The weapon cannot be fired until all three safeties have been disengaged. Continued on next page

MCI Course 8017A

8-9

Study Unit 8, Lesson 1

Firing Mechanism, Continued Transport Safety Pin

The transport safety pin blocks the firing pin from striking the cartridge percussion cap. To disengage the safety, pull it outward and release. See the diagram below.

Cocking Lever

The cocking leaver separates the firing rod and trigger to prevent accidental firing.

To cock, push the lever forward and rotate it downward and to the right. This will cause the firing rod to connect to the red trigger button as illustrated below.

Continued on next page MCI Course 8017A

8-10

Study Unit 8, Lesson 1

Firing Mechanism, Continued

Forward Safety

The forward safety is on the front end of the firing mechanism. It blocks the firing rod from striking the firing pin. To disengage the forward safety, hold it down as shown below.

MCI Course 8017A

8-11

Study Unit 8, Lesson 1

Sights

Introduction

The AT-4’s front and rear sights resemble those of the M16-series rifle. This feature makes it easier to hit targets with the AT-4.

Front Sight

As shown in the picture below, the front sight consists of · · ·

Rear Sight

A sight blade (1) with a center post (2) Left and right lead posts (3) A semicircular white line (4) to help obtain the proper sight picture

As shown in the picture below, the rear sight consists of · · · ·

A sight blade (6) A range setting knob (7) A range scale (8) with a range indicator (12) Two peepholes (11) · ·

2mm peephole (9) for normal light conditions 7mm peephole (10) for limited visibility

Continued on next page MCI Course 8017A

8-12

Study Unit 8, Lesson 1

Sights, Continued

Opening the Sights

As shown in the picture below, to open the · ·

MCI Course 8017A

Rear sight cover. Press down on the sight cover and slide it forward. Front sight cover. Press down on the sight cover and slide it backwards.

8-13

Study Unit 8, Lesson 1

Packaging

Packaging the AT-4

AT-4s are individually wrapped in a plastic barrier bag and packed in wooden containers containing five AT-4s. The illustration below shows the packing of AT-4 containers.

Note: Do not stack containers more than four deep on a pallet, as shown below:

MCI Course 8017A

8-14

Study Unit 8, Lesson 1

Marking

Introduction

The AT-4 launchers are marked with color-code bands for proper identification for use.

Markings of Container

Each wooden container is marked on the two corners that shows · ·

Marking of Launcher

The color code for the type of round packed inside. The serial numbers and classification for each round.

The color-code bands that represent use of the AT-4 are listed in the table below. Bands Black/Yellow Gold/Yellow (None)

Use High explosive anti-tank Field handling trainer M287 9-mm tracer bullet trainer

Note: Early models have a sold black band to indicate HE anti-armor rounds

MCI Course 8017A

8-15

Study Unit 8, Lesson 1

Lesson 1 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 8 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

The primary mission for the AT-4 is to engage a. b. c. d.

Item 2

Which of the following is the maximum effective range in of the AT-4? a. b. c. d.

Item 3

tanks from the front. low flying aircraft. armored personnel carriers. open artillery positions.

290 meters 300 meters 1,800 meters 2,100 meters

What are the descriptive characteristics of the AT-4? a. b. c. d.

Anti-armor weapon, air-cooled, gas-operated Self-contained, air-cooled, gas-operated Lightweight, self-contained, anti-armor weapon Lightweight, blowback-operated, anti-armor weapon Continued on next page

MCI Course 8017A

8-16

Study Unit 8, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Item 4

The purpose of the firethrough muzzle cover on the AT-4 launcher is to a. b. c. d.

Item 5

What are the three safety devices that must be disengaged before firing the AT-4? a. b. c. d.

Item 6

Rear sight Front sight Neither sight Both sights

How deep, on a pallet, can you stack AT-4 containers? a. b. c. d.

Item 8

Red safety button, cocking safety lever, transport pin Transport safety pin, red safety button, firing pin Cocking lever, red trigger button, transport safety pin Transport safety pin, cocking lever, forward safety

Where is the range setting knob found on the AT-4 launcher? a. b. c. d.

Item 7

indicate type of cartridge. keep moisture out of tube. provide codes for transporting. keep the firing mechanism from firing.

2 6 4 8

The color band used for the high explosive anti-tank cartridge is a. b. c. d.

red/yellow. gold/yellow. no band. black/yellow. Continued on next page

MCI Course 8017A

8-17

Study Unit 8, Lesson 1 Exercise

Lesson 1 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8

MCI Course 8017A

Answer c b c b d a c d

8-18

Reference Page 8-5 8-5 8-6 8-7 8-9 8-12 8-14 8-14

Study Unit 8, Lesson 1 Exercise

LESSON 2 OPERATING PROCEDURES Introduction

Estimated Study Time

25 minutes

Lesson Scope

This lesson discusses how to inspect, fire, and take appropriate procedures when a misfire occurs on the AT-4.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the steps for inspecting the AT-4.

·

Identify the steps to fire the AT-4.

·

Identify misfire procedures for combat using the AT-4.

This lesson contains the following topics: Topic Introduction Inspecting Firing Misfire Procedures Lesson 2 Exercise

MCI Course 8017A

8-19

See Page 8-19 8-20 8-21 8-27 8-29

Study Unit 8, Lesson 2

Inspecting

Introduction

The AT-4 is issued as a round of ammunition rather than a weapon; therefore, it is completely sealed, making it waterproof until fired. Inspection is limited to the visual examination of the external components.

Procedure

When opening the wooden container you should · ·

Remove plastic bag Visually inspect for obvious damage

The table below lists the components to be inspected. Item Be sure that Transport Safety Pin · It is in place and fully inserted. · The lanyard is attached to the pin. Cocking Lever · It is in the safe position. · It is folded down. Firethrough Muzzle It is intact. Cover Note: If it is ruptured or torn, cut it out. Be sure the muzzle does not contain foreign objects. Sights The sights function properly by opening the sight covers · The sights pop up properly. · The sights are not damaged. Forward Safety It does not move when depressed. Rear Seal · It is not cracked or damaged. · No foreign objects obstruct the rear of the AT-4. Shoulder Stop · It is not broken or damaged. · It unsnaps. · It folds down. Carrying Sling · It is not frayed. · It is attached firmly to the AT-4. Body There are no · Cracks · Dents · Bulges

MCI Course 8017A

8-20

Study Unit 8, Lesson 2

Firing

Procedure

The following table lists the steps to prepare the AT-4 for firing. Step 1

Action Cradle the weapon by removing the AT-4 from the carrying position with the left arm as shown in the picture below.

WARNINGS: · Be sure to insert earplugs. · Keep the weapon pointed towards the target. · Keep the backblast area clear 2

Remove the transport safety pin by pulling it out with the right hand and releasing it as shown in the picture below.

Continued on next page MCI Course 8017A

8-21

Study Unit 8, Lesson 2

Firing, Continued

Procedure, continued

Step 3

Action Unsnap the shoulder stop and unfold it as shown in the picture below.

4

Place the weapon on the right shoulder as shown in the picture below.

Continued on next page

MCI Course 8017A

8-22

Study Unit 8, Lesson 2

Firing, Continued

Procedure, continued

Step 5

Action As shown in the picture below, release the ·

Front sight · ·

·

Press down on the front sight cover Slide the cover to the rear

Rear sight · ·

Press down on the rear sight cover Slide the cover to the front

Continued on next page

MCI Course 8017A

8-23

Study Unit 8, Lesson 2

Firing, Continued

Procedure, continued

Step 6

Action To cock the AT-4 · · · · ·

Unfold the cocking lever with the right hand. Place the thumb under the cocking lever. Push the cocking lever forward and then down to the right. Place the fingers in front of the firing mechanism for added support. Let the cocking lever slide back as shown in the picture below.

CAUTION:

Do not refold the cocking lever or it will interfere with the firing mechanism. Continued on next page

MCI Course 8017A

8-24

Study Unit 8, Lesson 2

Firing, Continued

Procedure, continued

Step 7

Action Make sure your backblast area is large enough and that it is free of obstructions. Then, stabilize the weapon by pressing the shoulder stop against the shoulder as shown below. Note: For added stability · ·

8

Grasp the carrying sling near the muzzle with the left hand Pull back on the carrying sling until the shoulder stop is snug against the shoulder

Adjust the rear sight. If the range to target is · ·

Under 250 meters--no adjustment is necessary More than 250 meters--adjust the rear sight range setting

To adjust the range setting, turn the range setting knob toward the desired setting as shown in the picture below.

Continued on next page MCI Course 8017A

8-25

Study Unit 8, Lesson 2

Firing, Continued

Procedure, continued

Step 9

10

Action With your index and middle fingers on your right hand, hold the forward safety down and to your left as shown in the picture below.

Fire the AT-4 launcher by pressing the red fire button.

Note: Ensure you check the back blast area before firing.

MCI Course 8017A

8-26

Study Unit 8, Lesson 2

Misfire Procedures

Causes

A misfire is a complete failure to fire and may be caused by a faulty · · ·

While Training

Firing mechanism Element in the propelling charge explosive train Forward safety not depressed far enough

While training with the AT-4, should you encounter a misfire, follow the steps provided in the table below. Step 1 2 3 4 5 6

Failure to Fire

Action Immediately shout, “Misfire!” Maintain original sight picture. Release the forward safety. Recock the launcher. Press the forward safety all the way down. Attempt to fire.

After you have performed the misfire steps listed above and the weapon still fails to fire, perform the steps below for disposal of the launcher. Step 1 2 3 4 5 6

Action Shout misfire again. Release the forward safety and move the cocking lever to the safe (uncocked) position. Take the AT-4 off your shoulder while keeping the muzzle pointed toward the target. Reinsert the transport safety pin. Wait two minutes and then carefully lay the launcher on the ground with the muzzle facing toward the target. Dispose AT-4 launcher according to your unit’s SOP. Continued on next page

MCI Course 8017A

8-27

Study Unit 8, Lesson 2

Misfire Procedures, Continued

During Combat

If a misfire occurs during combat, perform the same steps as those performed during training.

Failure to Fire During Combat

In combat if the AT-4 fails to fire after performing misfire procedures · ·

MCI Course 8017A

Break off the sights to identify the misfired launcher. Place on the ground (pointing toward enemy) and use another launcher.

8-28

Study Unit 8, Lesson 2

Lesson 2 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 3 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

Inspection of the AT-4 is limited to the a. b. c. d.

Item 2

The first step in the firing the AT-4 is to a. b. c. d.

Item 3

visual examination of the external components. physical examination of all functional components. firing mechanism only. transport safety pin and sights only.

press the red safety catch. remove the transport safety pin. cradle the weapon. stabilize the weapon.

The gunner released the forward safety while performing misfire procedures on an AT-4. What is the next step the gunner must perform? a. b. c. d.

Shout misfire. Recock the launcher. Repress the forward safety. Attempt to fire. Continued on next page

MCI Course 8017A

8-29

Study Unit 8, Lesson 2 Exercise

Lesson 2 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer a c b

8-30

Reference Page 8-20 8-21 8-27

Study Unit 8, Lesson 2 Exercise

LESSON 3 MARKSMANSHIP FUNDAMENTALS Introduction Estimated Study Time

25 minutes

Lesson Scope

This lesson discusses the fundamentals of marksmanship of the AT-4.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the proper distance between the right eye and rear sight when aiming the AT-4.

·

Identify the correct placement of the front sight lead posts when firing at moving targets using the AT-4.

·

Identify the “steady hold” technique for firing the AT-4.

·

Identify the firing positions for the AT-4.

·

Identify the backblast danger zones for the AT-4 in an infantry fighting position.

·

Identify the conditions a building must meet to allow firing an AT-4 from inside.

This lesson contains the following topics: Topic Introduction Aiming Firing Firing Positions Firing Considerations Firing from Enclosures (Combat Only) Lesson 3 Exercise

MCI Course 8017A

8-31

See Page 8-31 8-32 8-34 8-35 8-42 8-43 8-44

Study Unit 8, Lesson 3

Aiming

Eye Relief

To sight the AT-4, first determine the range to the target. Once you have determined the range, place the AT-4 in position on the right shoulder so the right eye is 2½ to 3 inches from the rear sight.

Sight Picture

A correct sight picture is obtained when the sights are properly aligned and the aiming point (target) is in the correct relationship to the front sight posts as shown in the picture below. The sight picture includes two basic elements: · ·

Sight alignment Placement of the front sight lead posts

Continued on next page

MCI Course 8017A

8-32

Study Unit 8, Lesson 3

Aiming, Continued

Sight Alignment

To obtain correct sight alignment, the sights must be aligned as shown in the picture below. Ensure the proper sight alignment by looking through the rear sight peephole and focus your eye on the front sight post. The top center of the front sight posts are in the center of the rear sight peephole. Note: The white line fits inside the bottom half of the 2mm peephole.

Placement of Front Lead Post

The table below outlines the placement of the front lead post in various conditions. Target Pace Direction Stationary N/A Slow

Any

Fast (Greater than 10 MPH)

Right Left Oblique Toward or Away

MCI Course 8017A

8-33

Place the… Center post at the center of the visible mass of the target. Center post at the front in the direction that the vehicle is moving. Left lead post at the center of mass. Right lead post at the center of mass. Center post at the front in the direction that the vehicle is moving. Center post at the center of the visible mass of the target.

Study Unit 8, Lesson 3

Firing

Steady Hold

MCI Course 8017A

When firing the AT-4, apply the “steady hold.” As the term implies, steady hold is the technique of holding the AT-4 as steady as possible by ·

Holding the AT-4 in a tight, comfortable position as shown in the picture below so the AT-4 becomes a natural extension of the body.

·

Grasping with the left hand, the carrying sling where it is attached to the AT-4 near the muzzle.

·

Holding down the forward safety with the index and middle fingers of the right hand.

·

Pulling on the carrying sling with the left hand and at the same time, pulling back to the rear with the right hand. This helps to get the shoulder stop fully seated into the pocket of the shoulder.

·

Holding the elbows close to the body to aid in balance and control and to counter jerking and flinching.

8-34

Study Unit 8, Lesson 3

Firing Positions

Introduction

The AT-4 is fired from the right shoulder only in the following positions · · · ·

Standing Kneeling Sitting Prone

Note:

Standing Position

The exact position may vary slightly to allow for the shape of the shooter's body with individual preference governing the selection of the best position.

The standing position, as shown in the picture below, is similar to the offhand position for firing a rifle and will expose you more than any other position. Choose this position when firing from behind a protective barrier, such as a wall or a fighting position.

Continued on next page

MCI Course 8017A

8-35

Study Unit 8, Lesson 3

Firing Positions, Continued

Standing Position

To assume a proper standing position, follow the steps in the table below: Step 1 2

3 4

Action Raise the AT-4 about shoulder level, keeping the AT-4 pointed towards the target while rotating your body under the AT-4 by doing a half-left face. Spread your feet a comfortable distance apart and place the AT-4 on your right shoulder. Your body should be balanced with the hips level. Your left (non-firing) hand should be directly under the front of the AT-4 grasping the carrying sling. Place your left elbow against the body for stability. Grasp the firing mechanism with your right (firing) hand and keep your right elbow placed tightly against your body.

Note: This position is preferred to track moving targets. It allows you to turn your body from the waist up and not move your feet. Kneeling Position

There are two satisfactory kneeling positions. ·

The first kneeling position, is similar to the kneeling supported position for firing a rifle.

·

The second kneeling position, is a modification of the first kneeling position. This kneeling position is the best position for tracking moving targets. Continued on next page

MCI Course 8017A

8-36

Study Unit 8, Lesson 3

Firing Positions, Continued

Modified Kneeling Position

To assume this position, look at the table below. Step 1 2 3 4 5 6

Action Assume the standing position. Kneel on your right knee and point your left leg towards the target. Keep your left foot at a right angle and opposite your right knee, forming a right angle to the ground with the left leg. Sit back on your right heel while shifting your weight forward. Rest your left elbow just forward of your left knee. Hold your right elbow firmly against the body.

Continued on next page

MCI Course 8017A

8-37

Study Unit 8, Lesson 3

Firing Positions, Continued

Basic Kneeling Position

To get into this kneeling position, follow the steps below. Use this position to engage moving targets. Step 1 2 3 4 5

Note:

Action Assume the standing position. Kneel on your right knee, keeping your thigh of the right leg vertical. Keep your buttock and back straight. Point your left leg towards the target, keeping your left foot at a right angle and opposite your right knee. Keep your left thigh parallel to the ground. Keep your elbows tucked against your sides.

Either kneeling position may be used when firing at stationary or moving targets and the use of protective barriers and supported positions are essential to increase stability and reduce vulnerability. Continued on next page

MCI Course 8017A

8-38

Study Unit 8, Lesson 3

Firing Positions, Continued

Sitting Position

There are two sitting positions. The sitting positions are suitable for firing at stationary targets and are more stable than the kneeling positions. The modified sitting position is primarily used on downward slopes.

Modified Sitting Position

To assume the modified sitting position, follow the steps listed below: Step 1 2 3

Action Keep the AT-4 pointed towards the target and execute a half-left face. Sit with your legs crossed and place the AT-4 on your right shoulder. Lean slightly forward from the hips and rest your elbows forward of the knees to avoid bone-to-bone contact.

Continued on next page

MCI Course 8017A

8-39

Study Unit 8, Lesson 3

Firing Positions, Continued

Basic Sitting Position

To assume the basic sitting position, follow the steps listed in the table below. Step 1 2 3 4

Action Keep the AT-4 pointed towards the target and execute a half-left face. Sit with your legs partially extended and well apart and place the AT-4 on your right shoulder. Dig your heels in the ground to keep from sliding down. Rest your elbows forward of the knees to avoid bone-to-bone contact.

Continued on next page

MCI Course 8017A

8-40

Study Unit 8, Lesson 3

Firing Positions, Continued

Prone Position

This position is the most dangerous position due to its proximity to the ground. Ideally, the ground should slope downward from the rear of the launcher. This slope reduces the effects of the backblast.

Assume the Prone Position

To get into the prone position, follow the steps in the below table: Step 1 2

Action Lay the launcher on the ground, pointed toward the target. Lie on your stomach at an angle of not less than 90o to the line of fire. Important: Keep your body clear of the backblast.

3 4 5

MCI Course 8017A

Your body should be straight and your right leg should be directly on a line running through your right hip and right shoulder. Move your left leg to the left as far as possible without discomfort. Keep both heels as close to the ground as possible with your right eye lined up with the sights.

8-41

Study Unit 8, Lesson 3

Firing Considerations

Infantry Fighting Position

You can fire the AT-4 from the standard infantry fighting position. You must ensure the venturi protrudes past the rear of the position to minimize the danger to friendly troops due to backblast as shown in the picture below.

Backblast Danger Zones

The area immediately to the rear of an AT-4 must not have walls, large trees, or any other obstructions within 5 meters (Zone A) that can deflect the backblast onto you, as shown in the dark shaded area in the picture below. The backblast danger area (Zone B) is 60 meters deep with a 90o fan from the rear of the weapon, as the picture below, should be free of personnel.

MCI Course 8017A

8-42

Study Unit 8, Lesson 3

Firing From Enclosures (Combat Only)

Introduction

Firing from an enclosure creates unique hazards. Leaders must consider several factors that affect safety.

Considerations

Fire from a building only when all of the following conditions are met: ·

The building must be of sturdy construction.

·

The ceiling must be at least 8 feet high.

·

The room floor size must be at least 17 by 24 feet.

·

There must be an opening of at least 20 square feet to the rear of the AT-4 for the backblast pressure to escape. An open door at least 7 feet high by 3 feet wide would provide adequate ventilation.

·

All glass must be removed from the windows, and all loose objects removed from the room.

·

All Marines within the room must be forward of the backblast area of the AT-4.

·

All Marines in the room must protect their hearing with ear plugs when the AT-4 is fired.

·

The muzzle of the AT-4 must protrude 6 inches beyond the opening from which the AT-4 will be fired.

Note: When employed in multistoried buildings, the AT-4 should be positioned on upper levels for maximum coverage.

MCI Course 8017A

8-43

Study Unit 8, Lesson 3

Lesson 3 Exercise

Estimated Study Time

10 minutes

Directions

Complete items 1 through 6 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

When aiming the AT-4, the right eye should be at a distance of _________ inches from the rear sight. a. b. c. d.

Item 2

While aiming at a slow moving vehicle (any direction), place the lead post of the front sight a. b. c. d.

Item 3

2 to 3 2 to 3½ 2½ to 3 2½ to 3½

center post at the center of the visible mass of the target. center post at the front in which direction the vehicle is moving. left lead post at the front in which direction the vehicle is moving. right lead post at the front in which direction the vehicle is moving.

What technique is used to hold the AT-4 in a comfortable tight position? a. b. c. d.

Steady grasp Steady hold Standing Sitting Continued on next page

MCI Course 8017A

8-44

Study Unit 8, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Item 4

When engaging moving targets, what two firing positions are recommended? a. b. c. d.

Item 5

Backblast danger zone “B” has a 90-degree fan from the rear of the weapon, is _______ meters deep, and free of personnel. a. b. c. d.

Item 6

Standing and prone Prone and sitting Sitting and kneeling Standing and kneeling

30 40 50 60

When firing the AT-4 from inside a building, an open door at least ___ feet high by ___ feet wide will provide adequate ventilation. a. b. c. d.

7, 3 8, 4 10, 5 11, 6 Continued on next page

MCI Course 8017A

8-45

Study Unit 8, Lesson 3 Exercise

Lesson 3 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6

MCI Course 8017A

Answer c b b d d a

8-46

Reference Page 8-32 8-33 8-34 8-36/8-38 8-42 8-43

Study Unit 8, Lesson 3 Exercise

LESSON 4 TECHNIQUES OF FIRE AND RANGE DETERMINATION Introduction

Estimated Study Time

25 minutes

Lesson Scope

Marines who fire the AT-4 must learn how to determine range and vehicle speed to be successful in hitting their intended target.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the methods of determining range.

·

Identify how to estimate how far a vehicle moves in one second.

·

Identify the different methods to engage targets using the AT-4.

This lesson contains the following topics: Topic Introduction Range Determination Speed and Distance Estimation Methods of Target Engagement Lesson 4 Exercise

MCI Course 8017A

8-47

See Page 8-47 8-48 8-49 8-50 8-54

Study Unit 8, Lesson 4

Range Determination

Introduction

To be successful at hitting targets with the AT-4, we must first be able to accurately determine how far the target is from us.

Methods

The methods for determining range are listed below. · · · ·

Predetermined Range

Any of the methods listed above may be used; however, range to expected armor engagement locations should be predetermined and recorded on the · ·

MCI Course 8017A

Range finders Measuring the distance on a map Pacing (most desirable in defense) Using visual range estimation (least desirable)

Range card Squad sector sketch

8-48

Study Unit 8, Lesson 4

Speed and Distance Estimation

Introduction

The AT-4 is designed primarily for use against armored vehicles. Often these targets are in motion, and accurate engagement depends on the your ability to determine speed and range.

Speed

The ability to determine speed is developed through constant practice. One method of speed determination is to estimate how fast a vehicle moves during one second. Start counting when the front end of the vehicle passes a chosen object, shown in the black figure below. Count “one thousand one” (takes one second). IF… More than half of the vehicle passes the object shown in the outline figure below. Less than half of the vehicle passes the object.

THEN… Estimate the vehicle as being fast. Estimate the vehicle as being slow.

Note: If you don't have an object to use to estimate how fast a vehicle is moving, you will have to estimate the vehicle speed and determine if the vehicle is moving slow or fast. Consider all oblique moving vehicles to be slow and all flank moving vehicles to be fast.

MCI Course 8017A

8-49

Study Unit 8, Lesson 4

Methods of Target Engagement

Introduction

As leaders, we must think of how we are going to engage the target with the assets available. This section covers the methods to engage targets with the AT-4.

Single Firing

In single firing, a Marine fires one AT-4 with no succeeding shots fired at the target. Use this method only ·

At short ranges (200 meters or less) when you have not determined range to target

·

When you have accurately determined the range to the target at ranges longer than 200 meters

Note: Range determination and the fundamentals of AT-4 marksmanship must be emphasized. Practice and test · · ·

MCI Course 8017A

Sight alignment Steady hold positions Placing the AT-4 into and out of operation

8-50

Study Unit 8, Lesson 4

Methods of Target Engagement, Continued

Sequence Firing

A shooter who is equipped with two or more AT-4s and engages the target must · ·

Inspect and prepare the AT-4s before firing them. Observe the impact of the first round and continue to fire until the target is destroyed as shown in the illustration below.

Continued on next page

MCI Course 8017A

8-51

Study Unit 8, Lesson 4

Methods of Target Engagement, Continued

Pair Firing

In this case, two or more shooters equipped with two or more AT-4s engage a single target and each shooter inspects and prepares several AT-4s. ·

The first shooter announces the estimated range and the lead to be used and fires.

·

The second shooter observes the firing and announces a revised estimate of the range and lead if the target is not hit.

Example: The first gunner who sees the target identifies it and announces: “BMP, one five zero meters, fast target.” Note:

Each shooter continues exchanging range and lead information until the target is destroyed as shown in the illustration below:

WARNING: Be sure each shooter is clear of the other’s backblast area.

Continued on next page

MCI Course 8017A

8-52

Study Unit 8, Lesson 4

Methods of Target Engagement, Continued

Volley Firing

On a prearranged signal, two or more firers engage a single target. This method is desirable because more rounds are fired at a target at one given time, increasing the probability of killing the target as shown in the illustration below.

Note: You must determine the range to the target before firing. Continued on next page

MCI Course 8017A

8-53

Study Unit 8, Lesson 4

Lesson 4 Exercise Estimated Study Time

5 minutes

Directions

Complete items 1 through 3 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

Which of the following is the least desirable method of range determination? a. b. c. d.

Item 2

If less than half the vehicle passes an object in one second, the gunner can estimate the vehicle speed as being a. b. c. d.

Item 3

Range finders Pacing Firing the pair and sequence method Visual range estimation

stationary. slow. fast moderate.

One shooter with two or more AT-4s can employ which method of target engagement? a. b. c. d.

Single firing Sequence firing Pair firing Volley firing Continued on next page

MCI Course 8017A

8-54

Study Unit 8, Lesson 4 Exercise

Lesson 4 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3

MCI Course 8017A

Answer d b b

8-55

Reference Page 8-49 8-49 8-51

Study Unit 8, Lesson 4 Exercise

(This page intentionally left blank.)

MCI Course 8017A

8-56

Study Unit 8, Lesson 4 Exercise

LESSON 5 CAPABILITIES AND LIMITATIONS Introduction

Estimated Study Time

25 minutes

Lesson Scope

The AT-4 has greater penetrating power and after-armor effect than previous light antiarmor weapons. Use of the AT-4 is not limited to armored vehicles; it is also effective against bunkers and field fortifications.

Learning Objectives

After completing this lesson, you should be able to

In This Lesson

·

Identify the ways armored vehicles can be destroyed using the AT-4.

·

Identify the safety considerations for the AT-4.

·

Identify the backblast danger zones of the AT-4.

·

Identify the range firing precautions to be taken before firing the AT-4.

·

Select the methods to tactically employ the AT-4.

This lesson contains the following topics: Topic Introduction Destroying Armor Safety Considerations Backblast Area Range Firing Precautions Tactical Employment Lesson 5 Exercise

MCI Course 8017A

8-57

See Page 8-57 8-58 8-60 8-61 8-62 8-63 8-64

Study Unit 8, Lesson 5

Destroying Armor

Introduction

Armored vehicles have more protection on their front slopes, leaving them more venerable on their sides (flank). Shooters should try to engage an armored vehicle from the side or rear whenever possible. See the illustration below.

Note: You should always aim center of mass hit on a target to allow for a greater chance of a target hit. Target Hits

Hits on armored vehicles hits can be classified into the following groups: · · ·

Mobility Kill

Mobility kills Firepower kills Catastrophic kills

A mobility kill has occurred if · ·

The vehicle has stopped moving because a track or road wheel has been blown off. The vehicle has been hit in the engine compartment.

Important:

The vehicle is no longer mobile, but it can still return fire. Continued on next page

MCI Course 8017A

8-58

Study Unit 8, Lesson 5

Destroying Armor, Continued

Firepower Kill

The main gun cannot return fire because a hit in the turret has knocked out its capability to fire. Note: The vehicle can still move and can get away.

Catastrophic Kill

The vehicle can neither move nor return fire. For all practical purposes, it is destroyed. Note: To get a catastrophic kill, shooters should be prepared to fire a second or possibly a third shot to destroy the vehicle.

Visibility of Armored Vehicles

When an armored vehicle is buttoned up, the crew’ s visibility is restricted to around ten meters as shown in the picture below. This provides an opportunity for an armor killer team to approach the vehicle with less risk of detection.

Obstacles

Natural or manmade obstacles force a vehicle to slow down, stop, or channelize the vehicle, increasing the shooter’s chance for a possible first round hit.

MCI Course 8017A

8-59

Study Unit 8, Lesson 5

Safety Considerations

Introduction

Before firing the AT-4, the gunner must think about safety. Below are some safety precautions that must be considered.

Safety Considerations

Follow these safety precautions when using the AT-4.

MCI Course 8017A

·

Always observe the backblast area danger zones.

·

Do not fire the AT-4 when temperatures exceed its operating limits of -40 to 140 degrees Fahrenheit.

·

Do not engage targets closer than the minimum arming range. During training, do not engage targets closer than 30 meters.

·

Do not fire the tracer trainer device and tracer trainer cartridge at targets at a range of less than 125 meters because of the possibility of ricochet. Use wooden targets for stationary targets when possible.

·

All personnel must wear hearing protection when the AT-4s are fired.

·

Do not fire the AT-4 over the heads of friendly troops unless protection is adequate against direct impact and other hazards.

8-60

Study Unit 8, Lesson 5

Backblast Area Introduction

The AT-4 is a closed chamber weapon with a plexiglass baseplate at the rear. When the weapon is fired, gas pressure builds up inside the chamber and ruptures the baseplate. The gases exit the rear of the weapon in the form of a backblast.

Blackblast

Backblast can severely injure personnel and damage equipment. The total backblast area extends 65 meters (216 feet) to the rear of the AT-4.

Danger Zones

Clear the following danger zones before firing AT-4s: ·

·

MCI Course 8017A

Danger Zone A ·

This zone extends 5 meters immediately to the rear of the AT-4. It must be absolutely clear of all obstacles.

·

Clear away all obstacles, such as barriers, trees, or other vertical objects because of the risk of debris ricocheting. Any obstacle behind the shooter may deflect the backblast onto the shooter and cause injury.

·

Backblast heat or flying debris may injure the shooter and other Marines in this zone.

Danger Zone B. This zone extends 60 meters beyond danger Zone A in a 90-degree fan from the rear of the AT-4. Danger exists from backblast heat and from flying debris thrown to the rear by the force of the backblast. These debris and heat may cause injure to personnel and damage equipment.

8-61

Study Unit 8, Lesson 5

Range Firing Precautions

Precautions

MCI Course 8017A

While firing on the range, follow these precautions. ·

Before firing, clear the entire backblast area of all personnel, equipment, and flammable material.

·

Do not allow any personnel within 75 meters of the area behind the firing line without permission of the range safety officer or officer in charge.

·

Be sure that all shooters wear ear protection.

·

Cover all AT-4s to protect them from prolonged exposure to direct sunlight.

8-62

Study Unit 8, Lesson 5

Tactical Employment

Who

Marines who normally carry the M16A2 service rifle also carry and use the AT-4. The AT-4 supplements other organic anti-armor weapons.

Offense

In the attack, AT-4s should be readily available to influence the action because of its relatively short range, spread the AT-4 throughout the maneuver element. Use the AT-4 primarily against armored vehicles, although you may also use it against · · ·

Defense

In the defense, the AT-4 can play an important role in stopping the enemy. Here are some considerations for the use of the AT4 in the defense. · · · ·

Other Operations

Consider the AT-4 backblast when selecting and constructing fighting positions. Provide two or more AT-4s to positions that are assigned to fire AT-4s. Consider placing positions to achieve flank shots on enemy avenues of approach. Dispersion should also be considered to increase the probability of obtaining oblique fire on enemy armor approaching your defensive position.

Because of its light weight, the AT-4 can be use against such targets as command posts, communication installations, and supply dumps and is an excellent weapon for · · ·

MCI Course 8017A

Light vehicles Bunkers Crew-served weapon positions

Combat patrols Ambush parties Raiding parties

8-63

Study Unit 8, Lesson 5

Lesson 5 Exercise

Estimated Study Time

5 minutes

Directions

Complete items 1 through 5 by performing the actions required. Check your answers against those listed at the end of this lesson.

Item 1

Armored vehicle hits can be classified into which three groups? a. b. c. d.

Item 2

Which of the following is a safety consideration to be observed before firing the AT-4? a. b. c. d.

Item 3

Track kill, firepower kill, turret kill Turret kill, mobility kill, firepower kill Mobility kill, firepower kill, catastrophic kill Catastrophe kill, track kill, mobility

Impact danger zones Venturi danger Danger zone area Operating temperature limits

Backblast danger zone A extends _____ meters immediately to the rear of the AT-4. a. b. c. d.

5 15 30 60 Continued on next page

MCI Course 8017A

8-64

Study Unit 8, Lesson 5 Exercise

Lesson 5 Exercise, Continued

Item 4

When firing AT-4s on a range, the gunner needs to consider which of the following? a. b. c. d.

Item 5

Cover the AT-4s to protect them prolong exposure from direct sunlight. Wear protective masks and double the backblast area dimensions. Do not allow personnel within 70 meters behind the firing line. Equipment and flammable materials are kept at least 50 meters behind the shooter.

The methods of tactical employment for the AT-4 are offense, a. b. c. d.

defense, and other operations. defense, and tactical support. tactical support, and special operations. special operations, and fire support operations. Continued on next page

MCI Course 8017A

8-65

Study Unit 8, Lesson 5 Exercise

Lesson 5 Exercise, Continued

Answers

The table below provides the answers to the exercise items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5

MCI Course 8017A

Answer c d a a a

8-66

Reference Page 8-58 8-60 8-61 8-62 8-63

Study Unit 8, Lesson 5 Exercise

WEAPONS REVIEW LESSON EXAMINATION Review Lesson

Estimated Study Time

1 hour, 20 minutes

Introduction

The purpose of the review lesson examination is to prepare you for your final examination. We recommend that you try to complete your review lesson examination without referring to the text, but for those items (questions) you are unsure of, restudy the text. When you finish your review lesson and are satisfied with your responses, check your responses against the answers provided at the end of this review lesson examination.

Directions

Select the ONE answer that BEST completes the statement or that answers the item. For multiple choice items, circle your response. For matching items, place the letter of your response in the space provided.

Item 1

A role for the M9 pistol is to provide a. b. c. d.

Item 2

timely and accurate fire in a close combat situation. a means of defense for personnel assigned the M249 SAW. a means of defense for personnel assigned a crew served weapon. close fire support for in a combat situation.

What is the maximum effective range in meters of the M9 pistol? a. b. c. d.

10 25 50 75 Continued on next page

MCI Course 8017A

R-1

Review Lesson Examination

Review Lesson, Continued

Item 3

What is the sixth step in the cycle of operation of the M9 service pistol? a. b. c. d.

Item 4

What is the standard ammunition used for the M9 pistol? a. b. c. d.

Item 5

Lock slide to the rear Inspect the chamber Release the slide to go forward Place the weapon on safe

What is the second step when disassembling the slide group from the receiver of the M9 pistol? a. b. c. d.

Item 7

Any 9mm cartridge 9mm armor piercing NATO round 9mm ball NATO M882 9mm tracer NATO round

After removing the magazine, what is the next step to clear the M9 pistol? a. b. c. d.

Item 6

Locking Unlocking Extracting Ejecting

Depress the disassembly button Inspect the chamber Rotate the disassembly lever Slide the assembly off the receiver track

What are authorized cleaners/lubricants used on the M9 pistol? a. b. c. d.

RBC/CLP LSL/LSA CLP/LAW RBC/LSL Continued on next page

MCI Course 8017A

R-2

Review Lesson Examination

Review Lesson, Continued

Item 8

In extremely cold temperatures, ______ is used to lubricate the M9 pistol. a. b. c. d.

Item 9

In hot and humid environments, ________________ to prevent moisture and rust. a. b. c. d.

Item 10

the reverse of disassembly. identical to disassembly. only applicable to the first method. only applicable to the second method.

Identify the first step in performing a function check on the M9 pistol. a. b. c. d.

Item 12

inspect the M9 pistol daily keep the M9 pistol muzzle and receiver covered remove excess oil from the M9 pistol keep the M9 pistol free of moisture and lubricate daily

To assemble the M9 pistol, the steps are a. b. c. d.

Item 11

CLP LAW RBC LSL

Retract slide to rear. Insert empty magazine. Ensure safety lever is in safe position. Ensure safety lever is in up position.

You are loading the M9 pistol. The first round from the magazine is chambered when a. b. c. d.

the magazine catch is heard. the slide is retracted to the rear. the slide is released after it has been retracted to the rear. you insert the loaded magazine into the magazine well. Continued on next page

MCI Course 8017A

R-3

Review Lesson Examination

Review Lesson, Continued

Item 13

Where do you place your firing hand thumb when engaging targets with the M9 pistol? a. b. c. d.

Item 14

You are firing your M9 pistol and it fails to operate. What type of stoppage has occurred? a. b. c. d.

Item 15

Resting alongside the weapon. Wrapped along the pistol grip. Alongside non-firing thumb. Resting between middle finger.

Failure to extract. Failure to fire. Failure to chamber. Failure to cock.

The unhesitating application of a probable remedy when your M9 pistol fails to fire without investigating the cause of the malfunction is defined as a. b. c. d.

stoppage. immediate action. an unintentional interruption in the weapon’s cycle of operation. any unintentional interruption in the weapon. Continued on next page

MCI Course 8017A

R-4

Review Lesson Examination

Review Lesson, Continued

Item 16

Use the following list to answer the question below. 1. 2. 3. 4. 5. 6.

Supplements other supporting fires Destroys groups of enemy personnel Provides close fire support in the assault Supplements other organic anti-armor weapons Destroys bunkers and fortified positions Fires on enemy troops and automatic weapons in defilade

Which are the four capabilities of the M203 grenade launcher? a. b. c. d. Item 17

When engaging a point target, what is the maximum effective range in meters of the M203 grenade launcher? a. b. c. d.

Item 18

1, 2, 4, 5 2, 3, 5, 6 1, 2, 3, 6 1, 3, 4, 6

100 150 250 350

What type of M203 ammunition is used to engage enemy personnel armed with automatic weapons and dug into fighting positions? a. b. c. d.

HE CS VT Frag TP Continued on next page

MCI Course 8017A

R-5

Review Lesson Examination

Review Lesson, Continued

Item 19

Below in scrambled order are the steps for clearing the M203 grenade launcher. Put the steps in the proper order. Then answer the question. 1. 2. 3. 4.

Inspect the breech. Slide the barrel assembly forward. Depress the barrel latch. Place the weapon on safe by lowering the safety.

Which is the correct sequence of steps for clearing the M203 grenade launcher? a. b. c. d. Item 20

1, 2, 3, 4 4, 1, 3, 2 4, 2, 3, 1 4, 3, 2, 1

Which component of the M203 grenade launcher is removed first during disassembly? a. b. c. d.

Leaf sight, barrel, handguard Quadrant sight Barrel Handguard Continued on next page

MCI Course 8017A

R-6

Review Lesson Examination

Review Lesson, Continued

Item 21

What is the only authorized lubricant for the M203 grenade launcher? a. b. c. d.

Item 22

What is used to clean the bore of the M203 grenade launcher? a. b. c. d.

Item 23

Thong, CLP, LAW, rag Bore Brush, CLP, RBC Rag, Bore Brush, RBC Thong, rag, Bore Brush, CLP

In a below freezing environment, what is the best thing to do with the M203 grenade launcher if you are going to be sleeping in a sleeping bag? a. b. c. d.

Item 24

LAW CLP LSA Dry cleaning solvent

Keep the weapon in the sleeping bag with you. Stage the weapon with a gear guard in a warming tent. Keep the weapon with you but outside of the sleeping bag. Disassemble the weapon, then bring it in the sleeping bag.

You are assembling the M203 grenade launcher. Before sliding the barrel assembly onto the receiver, you must first a. b. c. d.

depress the barrel stop. tighten the mounting screw. remove the leaf sight. mount the quadrant sight. Continued on next page

MCI Course 8017A

R-7

Review Lesson Examination

Review Lesson, Continued

Item 25

What area of operation is checked when performing a function check on the M203 grenade launcher? a. b. c. d.

Item 26

Which M203 grenade launcher firing method would you use to engage targets at 200 meters? a. b. c. d.

Item 27

Leaf sight and front sight post Rifle sight Quadrant sight Hip-shoot

To adjust the leaf sight to increase the range for the M203 grenade launcher, use the adjustment screw to a. b. c. d.

Item 28

Safety and trigger Barrel stop and latch Both the safety and trigger and barrel stop and latch Cocking and safety

lower the leaf sight. raise the leaf sight. center the rear sight. align the rear and front sight.

One notch of the M203 quadrant sight equals ___ meters at ____ meters. a. b. c. d.

5; 100 5; 200 10; 100 10; 200 Continued on next page

MCI Course 8017A

R-8

Review Lesson Examination

Review Lesson, Continued

Item 29

Suddenly, you realize that an ammunition casing is stuck in the breech of your M203 grenade launcher. The stoppage that has just occurred is failure to a. b. c. d.

Item 30

cock. extract. fire. unlock.

What is the first thing you should do if your M203 grenade launcher has a misfire? a. Execute “Tap, Rap, Bang.” b. Open the breach, let the round fall to the ground. Load another round and attempt to fire. c. Shout “Misfire” and keep the weapon pointed down range. d. Remove the round and examine it for a dented primer.

Item 31

Which of the following is the effective casualty radius in meters of the M203 grenade launcher? a. b. c. d.

1 5 10 15 Continued on next page

MCI Course 8017A

R-9

Review Lesson Examination

Review Lesson, Continued

Items 32 Through 34

Item 35

Matching: In the space provided, place the letter of the employment method from column 2 that best describes the employment situation in column 1. The answers in column 2 may be used more than once. Column 1

Column 2

M203 Grenade Launcher Employment Situation

M203 Grenade Launcher Employment Method

___ 32. Destroys groups of enemy personnel. ___ 33. Enables you to deliver fire over the entire fire team sector. ___ 34. M16A2 rifle is employed until suitable targets appear.

a. Offensive b. Defensive

Below is a list of capabilities. Select the capabilities that are applicable to the M249 SAW. Then, answer the question. 1. 2. 3. 4. 5. 6. 7.

Supports rear security and special missions Supports the advance of the squad by fire in the offense Provides a fixed, final protective line across the squad front in the defense Supplements other supporting fires Provides close and continuous fire in support of front-line rifle squads Provides an increased volume of fire for a squad in the offense Provides long-range, close defensive, final protective fires as part of the squad's defensive lines

Which are the five missions applicable to the M249 SAW? a. b. c. d.

1, 2, 4, 5, 7 1, 4, 5, 6, 7 2, 3, 5, 6, 7 2, 4, 5, 6, 7 Continued on next page

MCI Course 8017A

R-10

Review Lesson Examination

Review Lesson, Continued

Item 36

What is the maximum effective range of the M249 SAW in meters for an area target? a. b. c. d.

Item 37

What are the principal characteristics of the M249 SAW? a. b. c. d.

Item 38

700 1,000 1,100 3,600

Blowback-operated, air-cooled, belt-fed Gas-operated, water-cooled, belt or magazine-fed Gas-operated, air-cooled, belt- or magazine-fed Recoil-operated, water-cooled, belt- or magazine-fed

Below are listings of cycles of operations. Identify which list for the M249 SAW is correct. a. Chambering, locking, feeding, firing, unlocking, ejecting, extracting, cocking b. Cocking, locking, feeding, chambering, firing, unlocking, extracting, ejecting c. Feeding, chambering, locking, firing, unlocking, extracting, ejecting, cocking d. Unlocking, feeding, firing, locking, cocking, ejecting, extracting, chambering

Item 39

Which of the following lists ammunition types used with the M249 SAW? a. b. c. d.

Ball, incendiary, tracer, blank Ball, dummy, tracer, armor-piercing Ball, tracer, dummy, blank High explosive, tracer, dummy, blank Continued on next page

MCI Course 8017A

R-11

Review Lesson Examination

Review Lesson, Continued

Item 40

Below in scrambled order are the steps for clearing the M249 SAW during an emergency situation. Put the steps in the proper order. Then, answer the question. 1. Push safety to the left until red ring is visible. 2. Raise the feed tray. Inspect the chamber and remove any ammunition there. 3. Push down on the magazine tab; remove the magazine. 4. Hold the cocking handle to the rear, depress the trigger, and ride the bolt forward. 5. Charge the M249 SAW. 6. Lower the feed tray. Be sure the cover assembly is locked. 7. Push safety to right (safe). Which is the correct sequence for clearing the M249 SAW? a. b. c. d.

2, 5, 7, 3, 1, 4, 6 3, 2, 5, 7, 6, 1, 4 5, 7, 2, 3, 1, 4, 6 5, 7, 3, 2, 6, 1, 4 Continued on next page

MCI Course 8017A

R-12

Review Lesson Examination

Review Lesson, Continued

Items 41 Through 44

Item 45

Matching: In the space provided, place the letter of the component of the M249 SAW from column 2 that is described by the function in column 1. The answers in column 2 may be used only once. Column 1

Column 2

M249 SAW Function

M249 SAW Component

___ 41. Houses the firing pin and roller assembly. ___ 42. Transfers power from propelling gases to the bolt slide assembly to operate the weapon. ___ 43. Locks the bipod in place on the receiver and provides a passageway for operating gases. ___ 44. Supports all major components and controls the functioning of the weapon.

a. b. c. d.

Piston Receiver Slide Gas cylinder

Which list correctly states some of the main groups of the M249 SAW? a. Barrel, operating rod assembly, piston, buttstock and shoulder assembly, bipod, trigger mechanism, receiver, gas cylinder b. Slide, piston, barrel assembly, trigger mechanism, bipod, gas regulator, handguards, operating rod assembly c. Gas cylinder, operating rod assembly, barrel assembly, handguard, trigger mechanism, buttstock, and shoulder assembly d. Buttstock and shoulder assembly, slide assembly and bolt, gas regulator, receiver, bipod, cocking handle, trigger mechanism, piston Continued on next page

MCI Course 8017A

R-13

Review Lesson Examination

Review Lesson, Continued

Item 46

The bolt must be forward to prevent death or injury before removing which assembly of the M249 SAW? a. b. c. d.

Item 47

What is the preferred material for cleaning and lubricating the M249 SAW? a. b. c. d.

Item 48

Rifle Bore Cleaner (RBC) Cleaner, Lubricant, Preservative (CLP) Gasoline High pressure water

What tool is used to clean carbon from the gas regulator on the M249 SAW? a. b. c. d.

Item 49

Operating rod Buffer Barrel Trigger

Cleaning rod Bore punch Bore brush Scraper tool

For which of the following extreme conditions should you do the following on an M249 SAW: Inspect the weapon frequently for rust. Keep the weapon as moisture-free as possible. Field-strip, clean, and lubricate the weapon more often. Use a generous coat of lubricant. a. b. c. d.

Hot, dry, and sandy Cold, snowy, and icy Cold, blizzard-like Damp and salty air Continued on next page

MCI Course 8017A

R-14

Review Lesson Examination

Review Lesson, Continued

Item 50

What is installed first in assembling the M249 SAW? a. b. c. d.

Item 51

Gas cylinder Handguard Bipod Cleaning equipment

Below, in scrambled order, are the steps for performing a function check on the M249 SAW. Put the steps in the proper order. Then, answer the question. 1. Place the fire/safe switch on S and depress the trigger. 2. Place the fire/safe switch on F and depress the trigger. 3. Pull the bolt to the rear and lock cocking handle forward. Which is the correct sequence of steps for performing a function check on the M249 SAW? a. b. c. d.

Item 52

1, 2, 3 1, 3, 2 2, 1, 3 3, 1, 2

The gunner for the M249 SAW can extend the legs of bipod when engaging targets by a. b. c. d.

grasping the foot of each leg and pulling down. holding the legs together and pulling down. releasing the legs in the down position. pulling down and away from the machinegun. Continued on next page

MCI Course 8017A

R-15

Review Lesson Examination

Review Lesson, Continued

Item 53

What are the components of the rear sight assembly on the M249 SAW? a. b. c. d.

Item 54

You are firing your M249 SAW and you observe the strike of your rounds impacting to the right of your target. What action would you have to take to bring the strike of the rounds on target? a. b. c. d.

Item 55

Turn the adjustment screw forward Change your sight alignment Move the windage knob backward (left) Move the windage scale to the right

When is the 30-round magazine authorized for use in the M249 SAW? a. b. c. d.

Item 56

Windage knob and leaf elevation Leaf windage and elevation knob Hooded elevation and leaf windage Elevation knob and windage knob

When reloading the weapon under fire During an emergency situation If the weapon fails to feed the ammunition belt While applying immediate action during firing

You apply immediate action on the M249 SAW when a. b. c. d.

a round is jammed in the chamber. the weapon won’t charge. there is a stoppage and you have not investigated the cause. the last round is fired from the 200-round ammunition box. Continued on next page

MCI Course 8017A

R-16

Review Lesson Examination

Review Lesson, Continued

Item 57

Which of the following states the role of the M240G? a. Primarily provides automatic fire for the fire team in both offensive and defensive operations b. Provides close defensive, final protective fires in the defense, either by using a final protective line or a principle direction of fire c. Provides reconnaissance by fire on suspected enemy positions in either offensive or defensive operations d. Supports the infantryman in offensive and defensive combat by providing a heavy volume of controlled and accurate fire beyond the capability of individual small arms

Item 58

Which of the following is the maximum effective range to an area target in meters for the M240G? a. b. c. d.

Item 59

What are the descriptive characteristics of the M240G? a. b. c. d.

Item 60

700 1,000 1,800 3,725

Belt-fed, air-cooled, gas-operated Belt-fed, water-cooled, gas-operated Belt-fed, air-cooled, recoil-operated Magazine-fed, air-cooled, blowback-operated

Which is the correct sequence in the cycle of operation of the M240G? a. Cocking, chambering, locking, firing, unlocking, extracting, ejecting, feeding b. Firing, unlocking, extracting, ejecting cocking, feeding, chambering, locking. c. Cocking, chambering, feeding, locking, firing, unlocking, extracting, ejecting d. Feeding, chambering, cocking, locking, firing, unlocking, extracting, ejecting Continued on next page

MCI Course 8017A

R-17

Review Lesson Examination

Review Lesson, Continued

Item 61

Which type of 7.62mm linked ammunition for the M240G can you use to observe fire, create incendiary effect, signal, and mark targets? a. b. c. d.

Item 62

What is the first step in clearing your M240G after completing live fire exercise? a. b. c. d.

Item 63

Ball Armor-piercing Tracer Dummy

Raise the cover. Visually inspect the chamber. Physically inspect the chamber with your finger. Point the weapon down range or in a safe direction.

Below in scrambled order are the steps for general disassembly of the M240G. Put the steps in the proper order. Then, answer the question. 1. 2. 3. 4. 5.

Remove the trigger housing group. Remove the barrel. Remove the operating group. Remove the receiver group. Remove the buttstock.

Which is the correct sequence for general disassembly of the M240G? a. b. c. d.

4, 3, 1, 2, 5 2, 4, 5, 3, 1 3, 4, 2, 5, 1 2, 1, 5, 4, 3 Continued on next page

MCI Course 8017A

R-18

Review Lesson Examination

Review Lesson, Continued

Item 64

Below is a list of cleaning and lubricating materials. Use this list to answer the question. 1. 2. 3. 4. 5.

Cleaner Lubricant Preservative (CLP) Rifle Bore Cleaner (RBC) Turpentine 3-in-1 oil Dry cleaning solvent

Which are authorized for the M240G? a. b. c. d. Item 65

Which is the proper maintenance schedule for your M240G after returning from a field exercise? a. b. c. d.

Item 66

1, 2, 5 1, 4, 5 2, 4, 5 3, 4, 5

Clean the gun immediately until all carbon and CLP is removed. Clean and lubricate the gun for three consecutive days. Clean and lubricate the gun weekly. Let gun soak in CLP for five days, then clean and lubricate.

What is the last part or group to be replaced during reassembly of the M240G? a. b. c. d.

Barrel group Buffer yoke Buttstock Trigger housing Continued on next page

MCI Course 8017A

R-19

Review Lesson Examination

Review Lesson, Continued

Item 67 Through 72

Item 73

Matching: In the space provided, place the letter of the steps for inspecting the M240G in column 2 in the correct sequence in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Correct Sequence

Steps for Inspecting M240G

___67. ___68. ___69. ___70. ___71. ___72.

a. Examine the rear sight b. Inspect the barrel socket chamber and bore for cracks c. Inspect the forward portion of the receiver rails and the face of the bolt d. Inspect the safety e. Inspect the bipod assembly f. Inspect the cover

The top of the front sight should be _________when the gunner correctly align the sights for the M240G on a target. a. b. c. d.

Item 74

to the left of the rear sight aperture to the right of the rear sight aperture centered in the rear sight aperture flush with the bottom of the rear sight aperture

While loading the M240G with the cover raised, which of the following conditions should exist? a. b. c. d.

Bolt forward, safety on F Bolt forward, safety on S Bolt to the rear, safety on F Bolt to the rear, safety on S Continued on next page

MCI Course 8017A

R-20

Review Lesson Examination

Review Lesson, Continued

Item 75

What is the first step you must perform to clear the M240G? a. b. c. d.

Item 76

What is the proper setting for the T&E mechanism when you are field zeroing the M240G? a. b. c. d.

Item 77

Lift the feed tray cover. Pull the bolt to the rear. Clear the feed tray of ammunition. Lift the feed tray and inspect the chamber.

Centered At the far left of the traversing bar At the far right of the traversing bar Zero degrees magnetic

The gunner must ________ when changing the barrel on the M40G mounted on it bipod. a. insert the cold barrel into the barrel socket and be sure it is fully seated b. lock the barrel into the receiver with the barrel lock. Then, you may continue the mission c. lock the gun in position by the T&E mechanism and pintle lock d. stabilize the gun by locking the buttstock into your right shoulder

Item 78

Which of the following conditions is considered a malfunction of the M240G? a. b. c. d.

Defective ammunition Failure to fire Sluggish operation Failure to feed Continued on next page

MCI Course 8017A

R-21

Review Lesson Examination

Review Lesson, Continued

Item 79

What is a common cause for a runaway gun on a M240G? a. b. c. d.

Item 80

What is the first step in immediate action you must take when a stoppage occurs with the M240G? a. b. c. d.

Item 81

Faulty ammunition Failure to unlock Worn parts Improper loading

Wait until the barrel cools to air temperature. Observe the ejection port while pulling the bolt to the rear. Lubricate the weapon, inspecting all parts. Wait 5 seconds for a hangfire.

What is the role of the M2HB .50-caliber machinegun? a. Provides a high volume of fire, effective against lightly-skinned armored vehicles, structures, and personnel b. Supports the infantry in both the offense and the defense by providing a heavy volume of accurate, long-range fire c. Provides close defensive and final protective fires in the defense and reconnaissance by fire on suspected enemy positions in the offense d. Provides protection for any motorized movement

Item 82

What are the descriptive characteristics of the M2HB .50-caliber machinegun? a. b. c. d.

Belt-fed, air-cooled, gas operated Belt-fed, water-cooled, recoil-operated Magazine-fed, air-cooled, blowback-operated Belt-fed, air-cooled, recoil-operated Continued on next page

MCI Course 8017A

R-22

Review Lesson Examination

Review Lesson, Continued

Item 83

What mount is the principal ground mount for the M2HB .50-caliber machinegun? a. b. c. d.

Item 84

What type of round for the M2HB .50-caliber machinegun is used for light armored vehicles, concrete shelters, and other bullet-resisting targets? a. b. c. d.

Item 85

Vehicle mount M3 tripod mount M4 pedestal mount M66 ring mount

Ball Tracer Armor-piercing Armor-piercing incendiary

Which of the following is the correct sequence of steps for the cycle of operation of the M2HB .50-caliber machinegun? a. Firing, unlocking, extracting, ejecting, cocking, feeding, chambering, locking b. Feeding, extracting, unlocking, chambering, cocking, firing, ejecting, locking. c. Feeding, cocking, chambering, locking, firing, ejecting, unlocking, extracting d. Feeding, unlocking, extracting, ejecting, chambering, cocking, locking, firing

Item 86

To clear the M2HB machinegun, the gunner removes the ammunition, locks the bolt to the rear, opens the feed cover and then performs what step next? a. b. c. d.

Inserts a cleaning rod down the barrel. Inspects the T-slot in the face of the bolt and chamber. Removes ammunition. Places the machinegun in the automatic mode. Continued on next page

MCI Course 8017A

R-23

Review Lesson Examination

Review Lesson, Continued

Item 87

The six steps for disassembling the M2HB .50-caliber machinegun are listed below in scrambled order. Place them in the proper sequence. 1. 2. 3. 4. 5. 6. 7.

Remove the bolt group Remove the drive-spring rod assembly Remove the barrel extension Remove the buffer body Remove the backplate Remove the barrel group Remove the barrel buffer assembly

Which of the following is the correct order for disassembly of the M2HB .50caliber machinegun? a. b. c. d. Item 88

What maintenance schedule should be followed for the M2HB machinegun while conducting a seven-day field exercise? a. b. c. d.

Item 89

6, 2, 4, 7, 3, 5, 1 6, 4, 7, 3, 1, 5, 2 6, 5, 2, 1, 3, 4, 7 4, 7, 3, 6, 1, 2, 5

Clean your machinegun after firing. Clean your machinegun several times per day. Clean your machinegun for three consecutive days. Clean your machinegun at least daily.

What type of cleaner would you use on friction-producing parts and on the exterior of the M2HB .50-caliber machinegun? a. b. c. d.

RBC CLP PL special LSA Continued on next page

MCI Course 8017A

R-24

Review Lesson Examination

Review Lesson, Continued

Item 90

When preparing an M2HB .50-caliber machinegun for inspection, set the elevation for _______ meters and the windage to _____. a. b. c. d.

Item 91

During reassembly of the M2HB .50-caliber machinegun, after installing the barrel extension and bolt? a. b. c. d.

Item 92

Replace the barrel buffer group only. Replace the T block. Replace the drive spring. Replace the barrel

When should you perform a function check of the M2HB .50-caliber machinegun? a. b. c. d.

Item 93

500, 10 left 750, 10 right 1000, 0 1500, 0

After firing Before disassembling Immediately after assembling During an inspection

What is correct sight alignment for the M2HB .50-caliber machinegun? a. When the front sight blade is centered and halfway up in the rear sight aperture b. When the top edge of the front sight at the center base of the target while maintaining sight alignment c. When the front sight blade is at the bottom of the rear sight aperture d. When the front sight blade is at the top of the rear sight aperture Continued on next page

MCI Course 8017A

R-25

Review Lesson Examination

Review Lesson, Continued

Item 94

The two firing types for the M2HB .50-caliber machinegun are automatic firing and a. b. c. d.

Item 95

What are the two firing positions for the M2HB .50-caliber machinegun? a. b. c. d.

Item 96

Kneeling, prone Prone, sitting (legs folded or legs extended) Kneeling, sitting (legs folded or legs extended) Standing, prone

Which is a definition of a malfunction of the M2HB .50-caliber machinegun? a. b. c. d.

Item 97

single shot mode. three shot mode. burst mode. sniper.

Any failure of the gun to function satisfactorily Uncontrollable automatic fire Failure to function freely Any interruption in the cycle of operation

Which of the following is considered a stoppage on the M2HB .50-caliber machinegun? a. b. c. d.

Failure to fire Uncontrollable automatic fire Twisted ammunition belt Jammed trigger Continued on next page

MCI Course 8017A

R-26

Review Lesson Examination

Review Lesson, Continued

Item 98

While applying immediate action to an M2HB .50-caliber machinegun, the weapon fails to fire. What is your next step? a. b. c. d.

Item 99

Clear the gun and inspect to determine the cause of the stoppage. Attempt to fire again. Re-lay on target. Repeat immediate action.

Which of the following states a capability of the MK19? a. Provides protection for motorized movement b. Provides a high volume of fire, effective against lightly armored vehicles, structures, and personnel c. Provides indirect fire against vehicles, personnel, and bunkers d. Destroys enemy troops in defilade in support of infantry in the offense and the defense

Item 100

Which of the following is the maximum effective range in meters against a point target for the MK19? a. b. c. d.

Item 101

1,100 1,500 1,830 2,212

Which of the following is the correct sequence of steps in the cycle of operation of the MK19? a. Feeding, chambering, locking, firing, unlocking, extracting, ejecting, cocking b. Cocking, locking, firing, unlocking, extracting, ejecting, feeding, chambering c. Feeding, chambering, firing, extracting, ejecting, cocking d. Cocking, firing, extracting, ejecting, feeding, chambering Continued on next page

MCI Course 8017A

R-27

Review Lesson Examination

Review Lesson, Continued

Item 102

Which of the following is the standard round far the MK19? a. b. c. d.

Item 103

HEDP HE Practice HEP

The seven steps for clearing the MK19 are scrambled below. Place them in the correct sequence to answer the question. 1. 2. 3. 4.

Open the top cover assembly. Inspect the chamber and bolt face for ammunition. Point the gun in a safe direction. Place the safety switch to fire and ride the bolt forward. Return the charger handles to their original position. 5. Place the fire/safe switch on the S position. 6. Lower and pull the charger handles slightly to the rear, allowing sufficient space between the face of the bolt and the chamber for a visual inspection. 7. If ammunition is loaded in the gun, reach beneath the feeder and press the primary and secondary positioning pawls. At the same time, slide the linked rounds out of the feeder and feed tray. Which of the following lists the correct order of steps to clear the MK19? a. b. c. d.

6, 2, 1, 3, 7, 5, 4 2, 7, 5, 1, 6, 4, 3 3, 5, 1, 7, 6, 2, 4 3, 7, 4, 1, 6, 5, 2 Continued on next page

MCI Course 8017A

R-28

Review Lesson Examination

Review Lesson, Continued

Item 104

The procedures for disassembling the MK19 are listed below in scrambled order. Place the procedures in the proper order. Then answer the question. 1. 2. 3. 4. 5. 6. 7. 8.

Remove the top cover assembly Remove the alignment guide and ogive plunger Remove the feed slide assembly and feed tray Remove the secondary drive lever Remove the primary drive lever and vertical cam assembly Remove the bolt and backplate assembly Remove the sear assembly Remove round positioning block and charger assembly

Which of the following lists the correct order of procedures for disassembling the MK19? a. b. c. d. Item 105

1, 3, 6, 4, 5, 7, 8, 2 4, 1, 3, 6, 5, 7, 2, 8 3, 6, 4, 1, 7, 8, 5, 2 6, 2, 4, 1, 5, 8, 7, 2

Which of the following cleaning and lubricating materials is the preferred lubricant for the MK19? a. b. c. d.

Cleaner, Lubricant, Preservative (CLP) Lubricant, Arctic Weather (LAW) Lubricant, Weapons, Semi-fluid (LSAT) Rifle Bore Clearer (RBC) Continued on next page

MCI Course 8017A

R-29

Review Lesson Examination

Review Lesson, Continued

Item 106

Which of the following is the recommended order for assembling the MK19? a. In the same order it was disassembled b. Any random order c. In reverse order of disassembly

Item 107

The following are steps that you, the operator, should check before you conduct a function check on the MK19. 1. Feed slide assembly is all the way to the left 2. Bolt is forward. Which step is missing in the list provided above? a. b. c. d.

Item 108

Secondary drive lever is properly engaged with the feed slide pin. Sights are zeroed. Round is fully seated. Slide the drive lever lock on the vertical cam forward.

Which of the following types of mounts are used with the MK19? a. M3 tripod mount, M49 bipod, M66 ring mount b. M3 tripod mount, M2 heavy machinegun mount, HMMWV weapons station c. M64 cradle, M151 mount, M66 ring mount d. M3 tripod mount and vehicle mounts Continued on next page

MCI Course 8017A

R-30

Review Lesson Examination

Review Lesson, Continued

Items 109 Through 113

Item 114

Matching: In the space provided, place the letter of the function in column 2 that matches the part on the MK19 sight assembly listed in column 1. The answers in column 2 may be used only once. Column 1

Column 2

MK19 Part

MK19 Function

___ 109. ___ 110. ___ 111. ___ 112. ___ 113.

a. b. c. d. e.

Sets the elevation. Releases the sight frame. Adjusts the degrees of elevation. Adjusts the windage. Contains the graduated range indications.

What is the first thing you must do to prepare to engage a target with the MK19? a. b. c. d.

Item 115

Elevation wheel Sight frame Plunger Aperture carrier Windage screw

Adjust the T&E mechanism to obtain a sight picture on the target. Affix the AN/TVS-5 night vision sight. Estimate the range to the target. Check the plunger.

In the sequence of steps in the procedure for feeding the MK19 listed below, which is the missing step? 1. 2. 3. 4. 5.

______ Insert the first round, female link first, into the feeder. Push the round across the first pawl until you hear a “click.” Move the secondary drive lever to the left and close the top cover. Close the top cover.

a. b. c. d.

Raise the top cover. Clear the MK19. Charge the MK19. Sight in on the target. Continued on next page

MCI Course 8017A

R-31

Review Lesson Examination

Review Lesson, Continued

Item 116

Item 117

In the sequence of steps in the procedure for charging the MK19 listed below, which is the missing step? 1. 2. 3. 4.

Grasp the charger handles. Press the charger handle locks in and rotate charger handles down. _______ Return the charger handles forward and rotate them up to the locked position.

a. b. c. d.

Close the top cover. Ride the bolt forward. Unlock charger handles. Pull the chargers to the rear.

In the sequence of steps for loading the first round onto the face of the bolt into the MK19 listed below, which is the missing step? 1. 2. 3. 4.

Place the fire/safe switch on the F position. Press the trigger. _______ Return the fire/safe switch to the S position.

a. b. c. d.

Open the top cover. Aim in on target. Charge the gun again. Ride the bolt forward. Continued on next page

MCI Course 8017A

R-32

Review Lesson Examination

Review Lesson, Continued

Item 118

In the sequence of steps in the procedure for firing the MK19 listed below, which is the missing step? 1. Place the fire/safe switch in the F position. 2. __________ 3. Press the trigger to fire. a. b. c. d.

Item 119

Which are the two most common malfunctions of the MK19? a. b. c. d.

Item 120

Runaway gun and sluggish operation Dirt in the receiver and lack of lubrication Failure to feed and failure to fire Improper operation and an interruption in the cycle of operation

Which of the following are the two most common types of stoppages of the MK19? a. b. c. d.

Item 121

Place your hands on the control grips with your thumbs on the trigger. Pull the chargers to the rear. Ensure that the top cover is closed. Aim in on the target.

Runaway gun and sluggish operation Failure to feed and failure to fire Improper operation and an interruption in the cycle of operation Dirt in the receiver and lack of lubrication

In combat, what is the first step in immediate action on the MK19? a. b. c. d.

Clear the gun and reload. Clear the gun and conduct a function check. Press charger handle locks and rotate charger handles down. Wait 5 seconds for a possible hangfire, then attempt to fire again. Continued on next page

MCI Course 8017A

R-33

Review Lesson Examination

Review Lesson, Continued

Item 122

What does the T&E mechanism allow you to do? a. b. c. d.

Item 123

Which part of the T&E mechanism allows you to adjust direction left and right? a. b. c. d.

Item 124

Engage armored vehicles at oblique angles. Fire from unsupported positions. Make a bipod-mounted gun fire more accurately. Quickly and accurately shift to predetermined targets.

Upper elevating screw yoke Upper and lower elevating screw Traversing handwheel Elevating handwheel

From the list below, which of the following is the procedure for centering the traversing mechanism? a. Turn the traversing handwheel toward your body until the ZERO on the scale is lined up with the ZERO index line. b. Turn the traversing handwheel until the muzzle of the weapon is centered in your primary sector of fire. c. Turn the traversing handwheel toward your body as far as it will go, then turn it two complete revolutions away from you. d. Slide the traversing slide so that the left edge is lined up with the index line.

Item 125

You are assigned a final protective line to the right, across the front of a platoon’s battle position. What would you do with the traversing slide to lay the machinegun? a. b. c. d.

Lock the traversing slide all the way to the left on the traversing bar. Lock the left edge on the ZERO graduation of the traversing bar. Lock the traversing slide on the graduation that indicates the FPL. Leave the traversing slide unlocked. Continued on next page

MCI Course 8017A

R-34

Review Lesson Examination

Review Lesson, Continued

Item 126

You are obtaining a direction reading on the T&E. The M2HB .50-caliber machinegun is on the center of the target. The gunner looks at the traversing bar scale and see that the left edge of the traversing slide is between 210 and 215 graduation. What is the next step the gunner must perform? a. b. c. d.

Item 127

Turn the traversing handwheel until the muzzle of the gun is centered. Move the left edge of the traversing slide to 210 graduation. Move the left edge of the traversing slide to 215 graduation. Add the mil readings to obtain your direction reading.

In the sequence of steps in the procedure for obtaining an elevation reading listed below, which is the missing step? 1. Estimate the range to the target and set the sight to this range. 2. _________ 3. Lower your head until your eyes are on line with the top of the elevating handwheel. The first portion of this reading is the number and the plus or minus sign above the first visible index line. 4. Look at the top of the elevating handwheel. The second portion of the reading is the graduation on line with the indicator. a. b. c. d.

Item 128

Place sandbags on the tripod legs. Lay the gun on the center base of the target. Align the elevating handwheel with the ZERO index line. Unlock the traverse slide mechanism.

In addition to its primary target, the AT-4 may also be used against a. b. c. d.

low flying aircraft. open artillery positions. bunkers. personnel in an open field. Continued on next page

MCI Course 8017A

R-35

Review Lesson Examination

Review Lesson, Continued

Item 129

What is the maximum effective range in meters of the AT-4? a. b. c. d.

Item 130

The main characteristics of an AT-4 are that it is a lightweight, _________, anti-armor weapon. a. b. c. d.

Item 131

gas-operated self-contained blowback operated air cooled

What is the caliber of the AT-4 rocket? a. b. c. d.

Item 132

200 meters 300 meters 400 meters 500 meters

74mm 84mm 94mm 104mm

The _______ keeps out moisture and prevents foreign objects from entering the muzzle. a. b. c. d.

venturi muzzle cap color code band firethrough muzzle cover Continued on next page

MCI Course 8017A

R-36

Review Lesson Examination

Review Lesson, Continued

Item 133

The ________ is a safety that provides for safe transportation of the AT-4. a. b. c. d.

Item 134

The ________ sight on the AT-4 has a sight blade, range setting knob, range scale, and two peep holes. a. b. c. d.

Item 135

2 3 4 5

The color band used for the AT-4 practice round is a. b. c. d.

Item 137

front barrel rear gun

Do not stack AT-4 containers more than ____ deep on a pallet. a. b. c. d.

Item 136

cocking lever red safety catch trigger safety transport safety pin

black/yellow. gold/yellow. blue. red.

What part of the AT-4 should you inspect to ensure there are no cracks, dents, or bulges? a. b. c. d.

Body Rear seal Firethrough muzzle cover Color code band Continued on next page

MCI Course 8017A

R-37

Review Lesson Examination

Review Lesson, Continued

Item 138

The last safety to be disengaged before firing is the a. b. c. d.

Item 139

The common causes for a misfire on the AT-4 are the a faulty fire mechanism, _____________, and element in the propelling charge explosive train. a. b. c. d.

Item 140

1, 3 2, 2½ 2½, 3 2½, 3½

The placement of the front sight posts is primarily determined by the a. b. c. d.

Item 142

forward safety not depressed far enough firing pin cocking lever rear safety pin

When aiming the AT-4, the eye relief should be ___ to ___ inches. a. b. c. d.

Item 141

transport safety pin. cocking lever. forward safety. trigger safety.

distance to the target. speed of the target. level of visibility. angle of the target.

The technique that should be applied when firing the AT-4 is the a. b. c. d.

steady hold. supported kneeling. supported prone. steady squeeze. Continued on next page

MCI Course 8017A

R-38

Review Lesson Examination

Review Lesson, Continued

Item 143

Which firing position for the AT-4 is preferred to track moving targets? a. b. c. d.

Item 144

The backblast danger zone A extends for how many meters? a. b. c. d.

Item 145

10 feet by 10 feet 12 feet by 10 feet 15 feet by 15 feet 17 feet by 24 feet

The most desirable way to determine range to possible engagement points in the defense is by a. b. c. d.

Item 147

5 15 30 60

What is the minimum size of a room that an AT-4 can be fired from? a. b. c. d.

Item 146

Standing Basic kneeling Modified kneeling Modified sitting

map estimation. visual estimation. pacing the distance. measuring with a M203 round.

If a vehicle is moving at an oblique to your position, you consider its speed to be a. b. c. d.

slow. stationary. fast. medium. Continued on next page

MCI Course 8017A

R-39

Review Lesson Examination

Review Lesson, Continued

Item 148

What is the best method to use to engage a single target at a known distance? a. b. c. d.

Items 149 Through 151

Single firing Sequence firing Pair firing Volley firing

Matching: In the space provided place the letter of the definition from column 2 that identifies the armor destruction term for the AT-4 in column 1. The answers in column 2 may be used only once. Column 1

Column 2

Armor Destruction Term

Definition

___ 149.

a. Only the main gun of a vehicle can not return fire b. The vehicle is completely destroyed c. The vehicle can not move, but it can return fire

Mobility kill

___ 150. Fire power kill ___ 151.

Item 152

Catastrophic kill

Do not fire the AT-4 when temperatures exceed its operating limits of ___ to ____ degrees Fahrenheit. a. b. c. d.

-20/120 -30/130 -40/140 -50/150 Continued on next page

MCI Course 8017A

R-40

Review Lesson Examination

Review Lesson, Continued

Item 153

Backblast danger zone “B” extends _____meters in a ____degree fan behind the weapon. a. b. c. d.

Item 154

5, 45 5, 90 60, 45 60, 90

When constructing a fighting position for AT-4's, consider a. b. c. d.

MCI Course 8017A

backblast. depth of position. storage for AT-4's obtaining frontal fires on the enemy.

R-41

Review Lesson Examination

Review Lesson Solutions

Answers

The table below provides the answers to the review lesson items. If you have any questions, refer to the reference page listed for each item. Item Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Answer a c c c a c c b a a b c a b b c b a d b b d c a c a b b b c b a b

Reference Page 1-4 1-6 1-7 1-8 1-12 1-15 1-18 1-18 1-20 1-26 1-30 1-31 1-33 1-36 1-37 2-4 2-5 2-7 2-14 2-15 2-17 2-17-2-18 2-19 2-25 2-26 2-30 2-31 2-33 2-41 2-42 2-43 2-43 2-44 Continued on next page

MCI Course 8017A

R-42

Review Lesson Examination

Review Lesson Solutions, Continued

Answers, continued

Item Number 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

Answer a a b c c c d c a d b c a b d d c d a d c b c d c a b c d d a b a f d

Reference Page 2-44 3-4 3-6 3-8 3-9 3-10 3-19/3-20 3-20 3-20 3-20 3-20 3-21 3-21 3-29 3-31 3-33 3-40 3-47 3-48 3-52 3-58 3-55 3-60 4-4 4-6 4-6 4-7 4-9 4-20 4-23 4-34 4-36 4-39 4-44 4-44 Continued on next page

MCI Course 8017A

R-43

Review Lesson Examination

Review Lesson Solutions, Continued

Answers, continued

Item Number 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

Answer c b e a c d b a d c c d b d b c a b c d d c c c a a b a a d b

Reference Page 4-44 4-44 4-44 4-44 4-54 4-55 4-57 4-58 4-59 4-60 4-60 4-61 5-5 5-9 5-10 5-13 5-14/15 5-21 5-22 5-29 5-29 5-31 5-36 5-41 5-54 5-56 5-58 5-60 5-61 5-63 6-4 Continued on next page

MCI Course 8017A

R-44

Review Lesson Examination

Review Lesson Solutions, Continued

Answers, continued, continued

Item Number 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126

Answer b a a c b c c a d c e b a d c b d c a a b c d c c a b

Reference Page 6-5 6-7 6-8 6-16 6-18 6-27 6-34 6-43 6-44 6-51 6-51 6-51 6-51 6-51 6-52 6-53 6-54 6-54 6-55 6-56 6-57 6-58 7-4 7-5 7-10 7-11 7-13 Continued on next page

MCI Course 8017A

R-45

Review Lesson Examination

Review Lesson Solutions, Continued

Answers, continued

Item Number 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154

MCI Course 8017A

Answer b c b b b d d c c b a c a c b a a a d c a d c a b c d a

R-46

Reference Page 7-15 8-5 8-5 8-6 8-6 8-7 8-9 8-12 8-14 8-15 8-20 8-26 8-27 8-32 8-33 8-34 8-34 8-42 8-43 8-48 8-49 8-53 8-58 8-59 8-59 8-60 8-61 8-63

Review Lesson Examination