TM11416A-IN/1
TECHNICAL MAINTENANCE MANUAL FOR MK 12 MOD 1 SPECIAL PURPOSE RIFLE (SPR)
DISTRIBUTION STATEMENT D: Distribution authorized to DoD and DoD contractors only; due to Specific Authority, (Public Law 90-629-ARMS EXPORT CONTROL ACT AND DoD 5230.25 WITHHOLDING OF); June 2007. Other requests shall be referred to; Commander MCSC, PGD-13, Quantico, VA 22134-6030.
DESTRUCTION NOTICE: Destroy by any method that will prevent disclosure of contents or reconstruction of document. August 31, 2007
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WARNINGS 1. Before starting inspection, do not actuate trigger until weapon has been cleared. Inspect chamber to be sure that it is empty. Check for obstructions in barrel bore. 2. Ejector is under spring tension; unintentional release will result in flying parts and possible injury. 3. Detent is under spring tension; unintentional release will result in flying parts and possible injury. 4. Use appropriate Personal Protective Equipment (PPE) for the job. Striking any object with hammer can result in flying debris or parts. Safety glasses or goggles are required when performing maintenance. 5. Several parts of MK 12 MOD 1 are under spring tension. Use caution when removing these parts to avoid injury or loss of parts. 6. MK 12 MOD 1’s bolt must not be interchanged with other MK 12 MOD 1’s unless headspace has been checked. 7. Dry cleaning solvent is flammable and toxic. Make sure there is adequate ventilation. Keep away from ignition source. Make sure PPE is available when using solvent. 8. Do not use dry cleaning solvent on plastic or rubber parts or components. Due to aggressive nature solvents can render plastic or rubber parts unserviceable. 9. The buffer/spring is under spring tension; unintentional release will result in flying parts and possible injury. 10. Ensure weapon is unloaded prior to gaging.
CAUTIONS 1.
Both parts are under spring tension; be sure to maintain receiver in a position that will prevent parts from flying.
2.
Trigger group is held together with a pilot pin. Do not remove pilot pin or trigger group components will separate.
3.
Do not allow hammer to fall freely. This can damage hammer and receiver. Keep thumb over hammer.
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LIST OF EFFECTIVE PAGES NOTE The portion of text affected by the changes is indicated by a vertical line in outer margins of page. Changes to illustrations are indicated by a miniature pointing hand.
Dates of Issue for original and changed pages are: VERSION
NUMBER
DATE ISSUED
Original
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August 13, 2007
THERE ARE PAGES 144 IN THIS TEHCNICAL MANUAL CONSISTING OF THE FOLLOWING: PAGE NUMBER
*CHANGE NUMBER
Front Cover
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Warning Summary
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List of Effective Pages
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List of Acronyms
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How to Use this Manual
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2-1 - 2-70
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3-1 - 3-8
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PAGES
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DEPARTMENT OF THE NAVY Headquarters, U.S. Marine Corps Washington, DC 20480-0001 1. This Technical Manual (TM), authenticated for Marine Corps use and effective upon receipt, provides organizational and intermediate level maintenance instructions for the MK 12 MOD 1 SPR. 2. Submit notice of discrepancies or suggested changes on a NAVMC 10772. The NAVMC may be submitted via the internet using website https://pubs.ala.usmc.mil/navmc/, the NAVMC Tracking Program and following instructions provided. It may also be submitted via e-mail to:
[email protected], or by mailing paper copy NAVMC 10772 in an envelope addressed to: Commander, Marine Corps Systems Command Attn: Assistant Commander Acquisition and Logistics (LOG/TP), 814 Radford Blvd., Suite 20343 Albany, Georgia, 31704-0343.
BY DIRECTION OF THE COMMANDANT OF THE MARINE CORPS OFFICIAL:
TJ Tafolla Program Manager - IWS Product Group Director, PGD-13 Marine Corps Systems Command DISTRIBUTION: EDO
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LIST OF ACRONYMS BOI CAGEC CLP CPC CCW CW DoD EIR FIG IAW NIIN NSN OM PMCS PPE PQDR QTY RAS RPSTL SSAVIE SMR SPR TM TMDE U/I U/M UOC
Basis of Issue Contractor and Government Entity Code Cleaner, Lubricant, and Preservative Corrosion, Prevention, and Controls Counterclockwise Clockwise Department of Defense Equipment Improvement, Recommendations Figure In Accordance With National Item Identification Number National Stock Number Operator’s Manual Preventive Maintenance Checks and Services Personal Protective Equipment Product Quality Discrepancy Report Quantity Rail Adapter System Repair Parts and Special Tools List Sustainment, Asset Visibility and Information Exchange Source, Maintenance, and Recoverability Special Purpose Rifle Technical Manual Test Measurement and Diagnostic Equipment Unit of Issue Unit of Measure Usable on Code
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HOW TO USE THIS MANUAL GENERAL In order to use this manual efficiently, you need to know: 1. Illustrations for the maintenance procedures show only those parts affected by the operation being performed. 2. Whenever the male gender is mentioned in the manual (i.e., crewmen, repairman), is also pertains to females. INDEXES This manual is organized to help you find the information you need quickly. There are several useful indexes and lists. 1. Table of Contents. Lists, in order, all chapters, sections, and appendices, gives page references. 2. Nomenclature Cross-Reference List. 3. Chapter Overviews. A summary of the chapter content is located at the beginning of each chapter. 4. Symptom Index. Located before the troubleshooting table in each maintenance chapter, they list possible rifle malfunctions and the page which describes the troubleshooting procedures. 5. Alphabetical Index. Located at the end of the manual. It is a subject-to-page list of everything in the manual. REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual. If you find any mistakes, or if you know of a way to improve the procedures, please let us know. MARINE CORPS USERS, submit NAVMC 10772 (Recommended Changes to Technical Publications) to: Commanding General, Marine Crops Logistics Base (Code 850) Albany, Georgia 31704-5000. A reply will be furnished directly to you. ARMY USERS, mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form 2028-2 directly to: Commander, US Army Armament, Munitions and Chemical Command, ATTN: AMSMC-MAS, Rock, Island, IL 61299-6000. A reply will be furnished to you. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATION (EIR) If your rifle needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what you don’t like about your equipment. Let us know why you don’t like the design. MARINE CORPS PERSONNEL, submit EIRs in accordance with MCO 1650.17. ARMY PERSONNEL, submit a SF 368 (Quality Deficiency Report). Mail to Commander, US Army Armament, Munitions and Chemical Command, ATTN: AMSMC-MAS, Rock, Island, IL 61299-6000. A reply will be furnished to you.
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TABLE OF CONTENTS SECTION
PAGE LIST OF ACRONYMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
CHAPTER 1
CHAPTER 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 SECTION I.
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-1. 1-2. 1-3. 1-4. 1-5.
SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 ISSUE AND RECOVERY OF INDIVIDUAL RIFLES. . . . . . . . . . . . . . . . . . . . . 1-1 REPORTING EQUIPMENT IMPROVEMENT, RECOMMENDATIONS (EIR). . 1-1 DESTRUCTION OF MARINE CORPS MATERIAL TO PREVENT ENEMY USE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 MAINTENANCE FORMS, RECORDS, AND REPORTS. . . . . . . . . . . . . . . . . . 1-1
SECTION II.
EQUIPMENT DESCRIPTION AND DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1-6. 1-7.
MAJOR COMPONENTS LOCATION AND DESCRIPTION.. . . . . . . . . . . . . . . 1-3 CORROSION, PREVENTION AND CONTROLS (CPC). . . . . . . . . . . . . . . . . . 1-3
MAINTENANCE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SECTION I. 2-1. 2-2. 2-3. 2-4. 2-5.
REPAIR PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIAL TOOLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXPENDABLE SUPPLIES AND MATERIALS LIST.. . . . . . . . . . . . . . . . . . . . . TORQUE LIMITS AND SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . LIST OF LOCALLY MANUFACTURED TOOL. . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 2-1 2-1 2-1 2-1
SECTION II.
SERVICE UPON RECEIPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-6. 2-7.
GENERAL.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SERVICE UPON RECEIPT OF MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
SECTION III. 2-8.
PREVENTIVE MAINTENANCE CHECKS AND SERVICE (PMCS) . . . . . . . . . 2-2 PMCS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
SECTION IV.
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2-9. 2-10.
MAINTENANCE TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 TROUBLESHOOTING PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
SECTION V.
MAINTENANCE PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
2-11. 2-12. 2-13. 2-14. 2-15. CHAPTER 3
REPAIR PARTS, SPECIAL TOOLS, COMMON TOOLS AND EQUIPMENT . . 2-1
UPPER RECEIVER ASSEMBLY MAINTENANCE. . . . . . . . . . . . . . . . . . . . . BOLT CARRIER ASSEMBLY MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . BOLT MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHARGING HANDLE MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LOWER RECEIVER MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-27 2-41 2-43 2-47 2-49
UNIT MAINTENANCE GAGING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SECTION I.
REQUIRED GAGES AND GAGING REQUIREMENTS . . . . . . . . . . . . . . . . . . 3-1
3-1. 3-2. 3-3.
REQUIRED GAGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 GAGING REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 GENERAL.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SECTION II.
GAGING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 v
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TABLE OF CONTENTS (CONT) SECTION 3-4. 3-5. 3-6. 3-7. APPENDIX A
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 A-1. A-2.
APPENDIX B
APPENDIX D
APPENDIX E
B-1 B-1 B-1 B-5 B-6
REPAIR PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
SECTION II.
CROSS REFERENCE INDEXES, FIGURE AND ITEM NUMBER . . . . . . . . . B-24
SPECIAL TOOLS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 SECTION I.
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
C-1.
SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
SECTION II.
SPECIAL TOOLS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
EXPENDABLE SUPPLIES AND MATERIALS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1 SECTION I.
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
D-1. D-2.
SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1 EXPLANATION OF COLUMNS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
SECTION II.
EXPENDABLE SUPPLIES AND MATERIALS LIST. . . . . . . . . . . . . . . . . . . . . D-1
TORQUE LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
LIST OF LOCALLY MANUFACTURED TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1 SECTION I. F-1. F-2. F-3. F-4. F-5.
APPENDIX G
SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXPLANATION OF COLUMNS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HOW TO LOCATE REPAIR PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION I.
E-1. APPENDIX F
TECHNICAL MANUALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 DEPARTMENT OF DEFENSE REGULATIONS. . . . . . . . . . . . . . . . . . . . . . . . A-1
MAINTENANCE REPAIR PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 B-1. B-2. B-3. B-4. B-5.
APPENDIX C
PAGE UPPER RECEIVER ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 UPPER RECEIVER ASSEMBLY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 BOLT/BOLT CARRIER ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 TRIGGER GROUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
SPECIAL TOOLING FABRICATIONS (ON-SITE) . . . . . . . . . . . . . . . . . . . . . . F-1 PIVOT PIN REMOVAL TOOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PIVOT PIN INSTALLATION TOOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CARRIER KEY TOOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PIVOT PIN INSTALLATION TOOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FABRICATED TRIGGER PILOT PIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F-1 F-2 F-2 F-3 F-3
RECOMMENDED CHANGES TO PUBLICATIONS/LOGISTICS MAINTENANCE DATA CODING NAVMC (10772) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1
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LIST OF FIGURES FIGURE Figure 1-1. Figure 1-2. Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-6. Figure 2-7. Figure 2-8. Figure 2-9. Figure 2-10. Figure 2-11. Figure 2-12. Figure 2-13. Figure 2-14. Figure 2-15. Figure 2-16. Figure 2-17. Figure 2-18. Figure 2-19. Figure 2-20. Figure 2-21. Figure 2-22. Figure 2-23. Figure 2-24. Figure 2-25. Figure 2-26. Figure 2-27. Figure 2-28. Figure 2-29. Figure 2-30. Figure 2-31. Figure 2-32. Figure 2-33. Figure 2-34. Figure 2-35. Figure 2-36. Figure 2-37. Figure 2-38. Figure 2-39. Figure 2-40. Figure 2-41. Figure 2-42. Figure 2-43. Figure 2-44. Figure 2-45. Figure 2-46. Figure 2-47. Figure 2-48.
PAGE Weapon Record Book, Page 5 (Round Count) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Major Components of Rifle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Upper Receiver Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Rail Adapter System (RAS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Upper Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Upper Receiver Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Barrel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Bolt Carrier Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Bolt Carrier Key Staking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Bolt Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 Charging Handle Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 Lower Receiver Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 Lower Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 Lower Receiver Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Buttstock Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Buffer Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Day Optic Sight Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 Back-up Iron Sights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 Suppressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Bipod Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 MK 12 MOD 1 SPR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Magazine Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 Magazine Catch Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 Selector Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 Firing Pin Protrusion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 Hammer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 Hammer Spring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 Bolt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18 Chamber. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18 Extractor Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 Ejector and Ejector Spring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20 Bolt Carrier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20 Bolt Carrier, Bolt Carrier Key, and Gas Tube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 Buffer and Buffer Spring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 Buffer and Buffer Spring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 Bolt Carrier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 Bolt Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 Gas Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 Bolt Catch Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24 Safety Selector Lever. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25 Suppressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 Back-up Iron Sight Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 Back-up Iron Sight Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 Back-up Iron Sight Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 Muzzle Break and Suppressor Alignment Collar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 Scope Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Upper Receiver Action Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Muzzle Break Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Handguard Nut Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 Handguard Nut and Alignment Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 ix/x blank
PCN 184 114160 00
LIST OF FIGURES (CONT.) FIGURE Figure 2-49. Figure 2-50. Figure 2-51. Figure 2-52. Figure 2-53. Figure 2-54. Figure 2-55. Figure 2-56. Figure 2-57. Figure 2-58. Figure 2-59. Figure 2-60. Figure 2-61. Figure 2-62. Figure 2-63. Figure 2-64. Figure 2-65. Figure 2-66. Figure 2-67. Figure 2-68. Figure 2-69. Figure 2-70. Figure 2-71. Figure 2-72. Figure 2-73. Figure 2-74. Figure 2-75. Figure 2-76. Figure 2-77. Figure 2-78. Figure 2-79. Figure 2-80. Figure 2-81. Figure 2-82. Figure 2-83. Figure 2-84. Figure 2-85. Figure 2-86. Figure 2-87. Figure 2-88. Figure 2-89. Figure 2-90. Figure 2-91. Figure 2-92. Figure 2-93. Figure 2-94. Figure 2-95. Figure 2-96. Figure 2-97. Figure 2-98.
PAGE RAS and Alignment Pin Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Tube Pin Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Tube Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Tube Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barrel Nut Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barrel Removal (cont). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barrel Removal (cont). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Separate RAS Retaining Nut and Barrel Nut from Barrel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . RAS Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barrel Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barrel Reassembly (cont). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Tube Alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Block and Tube Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Block and Tube Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Block Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alignment Pin and RAS Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Suppressor Alignment Collar Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Muzzle Break Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt Carrier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt Carrier Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt Carrier Key and Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Firing Pin Retaining Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extractor Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extractor Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extractor Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ejector Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ejector Installation/Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Rings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Charging Handle Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Charging Handle Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Charging Handle Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Magazine Catch Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Magazine Catch and Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt Catch Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt Catch Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pivot Pin Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pivot Pin Detent and Spring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pivot Pin Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pistol Grip Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pistol Grip Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pistol Grip Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger Guard Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger Guard Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger Guard Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger Guard Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lower Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger Assembly Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hammer Assembly Installation (cont). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-33 2-33 2-33 2-34 2-34 2-34 2-35 2-35 2-36 2-36 2-37 2-37 2-38 2-38 2-39 2-39 2-40 2-40 2-41 2-41 2-42 2-42 2-43 2-43 2-43 2-44 2-44 2-45 2-46 2-47 2-48 2-48 2-49 2-50 2-51 2-52 2-53 2-53 2-54 2-55 2-55 2-56 2-57 2-57 2-58 2-58 2-60 2-60 2-61 2-62
TM11416A-IN/1
LIST OF FIGURES (CONT.) FIGURE Figure 2-99. Figure 2-100. Figure 2-101. Figure 2-102. Figure 2-103. Figure 2-104. Figure 2-105. Figure 2-106. Figure 2-107. Figure 2-108. Figure 2-109. Figure 3-1. Figure 3-2. Figure 3-3. Figure 3-4. Figure 3-5. Figure 3-6. Figure 3-7. Figure 3-8. Figure 3-9. Figure 3-10. Figure B-1. Figure B-2. Figure B-3. Figure B-4. Figure B-5. Figure B-6. Figure B-7. Figure B-8. Figure B-9. Figure B-10. Figure F-1. Figure F-3. Figure F-2. Figure F-4. Figure F-5.
PAGE Function Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63 Buffer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 Buffer Assembly Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 Buffer Spring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 Buffer Retainer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65 Buttstock Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66 Buttstock Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67 Buttplate Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68 Buttplate Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69 Buttplate Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69 Buttplate Installation (cont). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69 Barrel Straightness Gage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Barrel Straightness Gage (cont) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Headspace Gage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 “Chambered Position”. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Firing Pin Protruding through Bolt Face. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Firing Pin Protrusion Gage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Slide Min. Notch Over Firing Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 Firing Pin Hole Plug Gage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Firing Pin Hole. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Trigger Pull Fixture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Major Rifle Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7 Bolt Carrier with Firing Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8 Bolt Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9 Upper Receiver Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10 Forward Assist Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11 RAS Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12 Barrel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-13 Lower Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17 Special Tools and Gages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-19 Pivot Pin Removal Tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1 Carrier Key Tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2 Pivot Pin Installation Tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2 Pivot Pin Installation Tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3 Fabricated Trigger Pilot Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3
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CHAPTER 1 INTRODUCTION CHAPTER OVERVIEW This chapter contains general information and equipment description and data on the MK 12 MOD 1. SECTION I. GENERAL INFORMATION 1-1. SCOPE. a. Type of Manual. This manual is provided for organizational and intermediate maintenance. b. Model Number and Equipment Name. The U.S. Marine Corps MK 12 Mod 1 Special Purpose Rifle (SPR). c. Purpose of Equipment. The purpose of this rifle is to provide rifle squad with a versatile weapon that meets the need for precision fire, multiple target engagements, and target suppression capability while eliminating the need to carry two or more weapons. 1-2. ISSUE AND RECOVERY OF INDIVIDUAL RIFLES. Individual rifles will be issued and recovered in the same manner as other individual weapons. NAVMC 10576 (Memorandum Receipt for Individual Weapons and Accessories) will be used as the issue document. NAVMC 10520 (Weapons Custody Receipt Card) will be used when the MK 12 MOD 1 System (Scope, Rifle, and Suppressor) is drawn from the armory for use. Detailed instructions for using these forms are contained in TM 4700-15/1_. 1-3. REPORTING EQUIPMENT IMPROVEMENT, RECOMMENDATIONS (EIR). If a way to improve this weapon is recognized, submit Recommended Changes to Publications/Logistics Maintenance Data Coding NAVMC (10772) in accordance with MCO 4855.10_ to below listed address. Report to: Marine Corps LogCom Command Element Attn: Quality Assurance Officer (L15) 814 Radford Blvd, Ste 20330 Albany, GA 31704-330 1-4. DESTRUCTION OF MARINE CORPS MATERIAL TO PREVENT ENEMY USE. To render equipment useless to the enemy, Marine Corps personnel shall destroy it by weapons, fire, smashing, disassembly, burning, or other means in accordance with TM 750-244-7. 1-5. MAINTENANCE FORMS, RECORDS, AND REPORTS. The Marine Corps forms and procedures used for equipment maintenance will be those prescribed by the current edition of TM 4750-15/1_ Ground Equipment Record Procedures, Appendix A, References, lists those specific forms to be used with the MK 12 MOD 1, but is not to be considered all-inclusive. Responsibility for proper execution of forms and records rests with the using unit. In order to maintain accurate records, it is imperative that units follow these instructions:
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a. NAVMC 1018, Inspection Tag. This form must be attached to each MK 12 MOD 1 that requires repair. The instructions for completing this form are found in TM 4700-15/1_. b. NAVMC 10558A, Weapon Record Book, Part II. This form is the most important of the three forms used with the MK 12 MOD 1 and must be filled out according to the paragraphs below. Each MK 12 MOD 1, when received from the supply system, will have a NAVMC 10558A attached. Receiving units must verify the serial number (weapon, scope, and suppressor) recorded on the front of weapon record book to ensure that they are identical. The NAVMC 10558A must be pulled out in the following manner, without reference to any other publications: (1)
Front Cover. The manufacturer will have filled out this page. No further entries will be made on it.
(2)
Page 3. This page will have been filled out when weapon is received by the using unit. The only additional entries required will be telescope serial number, if telescope is replaced. When a Weapon Record Book is replaced the number of CUMULATIVE TOTAL OF ROUNDS FIRED should be recorded from the previous Weapon Record Book.
(3)
Page 5, Unit Commander’s Record. Record daily total of rounds fired. Make entries as shown in Figure 1-1.
(4)
Page 51, Bore Inspection Record. This record contains all of maintenance data performed by organizational and higher level maintenance. Trigger pull (in lbs) and telescope serial number will be entries already made in Weapon Record Book when initially received.
(5)
Lost, Destroyed, or Misplaced Weapon Record Book. In the event a Weapon Record Book must be reconstructed, a limited technical inspection at intermediate maintenance level must be performed.
DATE
CUMULATIVE TOTAL OF ROUNDS FIRED 30
USERS NAME AND RANK
REMARKS
24 May 2005
NUMBER OF ROUNDS FIRED 30
Cpl J. Doe
25 May 2005
20
50
Cpl J. Doe
10 Suppressed 20 Unsuppressed 20 Suppressed
Figure 1-1. Weapon Record Book, Page 5 (Round Count)
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SECTION II. EQUIPMENT DESCRIPTION AND DATA 1-6. MAJOR COMPONENTS LOCATION AND DESCRIPTION.
Figure 1-2. Major Components of Rifle.
Bolt/Bolt Carrier Group (1) Upper Receiver (2) Lower Receiver (3)
Provides feeding, chambering, firing, extraction, and ejection using propellant gases and buffer/spring for power. Houses bolt/bolt carrier group, barrel and supports sighting systems. Operator is protected from heat energy by Handguard/MIRS Rail System. Contains safety mechanism and trigger group while supporting stock, pistol grip, and detachable magazine.
1-7. CORROSION, PREVENTION AND CONTROLS (CPC). The prevention of corrosion is critical for safe functioning of weapon system. Carry out corrosion prevention IAW TM 4795-12/1 (Organizational Corrosion Prevention and Control Procedures for USMC Equipment). Report reoccurring corrosion problems on NAVMC (10772) IAW MCO 4855.10_ (PQDR). Form shall be submitted to: Marine Corps LogCom Command Element Attn: Quality Assurance Officer (L15) 814 Radford Blvd, Ste 20330 Albany, GA 31704-330
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CHAPTER 2 MAINTENANCE INSTRUCTIONS CHAPTER OVERVIEW This chapter contains information regarding repair parts, special tools, common tools and equipment, instructions for service upon receipt, Preventive Maintenance Checks and Services (PMCS), troubleshooting, maintenance to keep weapon in good repair, and storage. SECTION I. REPAIR PARTS, SPECIAL TOOLS, COMMON TOOLS AND EQUIPMENT 2-1. REPAIR PARTS. Repair Parts are listed and illustrated in Appendix B. 2-2.
SPECIAL TOOLS.
Special Tools authorized for organization’s maintenance are listed and illustrated in Appendix C. 2-3.
EXPENDABLE SUPPLIES AND MATERIALS LIST.
Expendable/durable supplies and materials are listed and illustrated in Appendix D. 2-4.
TORQUE LIMITS AND SPECIFICATIONS.
Torque limits and specifications are listed in Appendix E. 2-5.
LIST OF LOCALLY MANUFACTURED TOOL.
Locally manufactured tools are listed in Appendix F. SECTION II. SERVICE UPON RECEIPT 2-6.
GENERAL.
When MK 12 MOD 1 SPR is received, it is the using organization’s responsibility to determine whether the weapon has been properly prepared for service by supplying organization and whether it is in condition to perform its mission. 2-7.
SERVICE UPON RECEIPT OF MATERIAL. WARNING Before starting inspection, do not actuate trigger until weapon has been cleared. Inspect chamber to be sure that it is empty. Check for obstructions in barrel bore. NOTE Weapon must be inspected and/or gaged at least quarterly for safety and serviceability IAW PMCS.
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2-5 SERVICE UPON RECEIPT OF MATERIAL. (CONT.) Item No.
Item to be Inspected MK 12 MOD 1 SPR
1. Container
2. MK 12 MOD 1 SPR
Upper/Lower Receiver
Procedure
Remarks
Check unpacked equipment. a. Inspect equipment for damage incurred during shipment. If equipment is damaged, report the damage on NAVMC (10772). b. Check equipment against packing slip to see if shipment is complete. Report all discrepancies on NAVMC (10772). c. Check to see whether equipment has been modified. Remove corrosion inhibitor from barrel and discard. a. Fieldstrip MK 12 MOD 1 and inspect for missing parts. b. Clean and lubricate. c. Reassemble. d. Perform function test.
SECTION III. PREVENTIVE MAINTENANCE CHECKS AND SERVICE (PMCS) 2-8.
PMCS. a. These services are to be performed by trained and authorized personnel. Operators will clean and lubricate IAW Operator’s Manual. b. Perform PMCS as required to keep weapon combat ready. Replace defective components as necessary. c. If weapon has not been used for 90 days, PMCS should also be performed IAW MCO P4790.2_ and TM4700-15/1_.
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2-6.
PMCS. (CONT.)
Item No. 1. 2.
Item to be Inspected MK 12 MOD 1 SPR Upper Receiver Assembly
Procedure Fieldstrip weapon. Check gun book for compliance with gaging requirements. Inspect upper receiver, barrel and rail system forend for bulges, cracks, bends, burrs, obstructions, or pits in chamber/bore.
Figure 2-1. Upper Receiver Assembly.
3.
Rail System Forend
Inspect "Ribs" for cracks, deformities, and burrs. Check for black surface finish, and make sure surfaces do not reflect light.
Figure 2-2. Rail Adapter System (RAS).
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2-6. PMCS. (CONT.) Item No. 4.
Item to be Inspected Receiver Cartridge
Procedure Inspect Ejection Port (1) for burrs and deformities. Inspect Ejection Port Cover (2) for bends, cracks, and burrs. Open and close ejection port cover to make sure Ejection Port Cover Spring (5) is not broken or weak. Inspect Cover Pin (3) for bends and cracks. Check for presence of C-clip (4). Inspect Forward Assist (6) for bends, cracks, and breaks. Also ensure complete forward movement with ability to engage bolt carrier and move it forward to locking position.
Figure 2-4. Upper Receiver Assembly. Figure 2-3. Upper Receiver.
5.
Gas Block and Gas Tube
Check Gas Block (6) for cracks, burrs, breaks, deformities, and movement. Inspect Gas Tube (1) for cracks, bends, bulges, and deformities, and tight fit. Inspect Suppressor Alignment Collar (3) for dents, bulges, and cracks. Inspect Set Screw (2); ensure it fits tightly on barrel and does not rotate. Inspect Thread Protector (5) for bends, cracks, breaks, and thread damage. Inspect Muzzle Break (4) for tightness, warping, and impact strikes. Inspect external threads for damage. Ensure Gas Tube Retaining Pin (7) is present. Ensure Gas Block Retaining Screws (8) are tight.
Figure 2-5. Barrel Assembly.
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2-6. PMCS. (CONT.) Item No. 6.
Item to be Inspected Bolt Carrier Assembly
Procedure Inspect Bolt Carrier (6) for burrs, cracks, deformities, and wear. Check Bolt Carrier Key (2) for cracks, burrs, and ensure hole is round on gas key. Also check Bolt Carrier Key Screws (3) for tightness, obstruction(s), and proper staking (Figure 2-7.). Check Bolt Cam Pin (5) for burrs, cracks, deformities, and wear. Check Firing Pin (1) for straightness, burrs, and breaks. Ensure tip is completely round. Check Firing Pin Retaining Pin (4) for burrs, cracks, and deformities.
Figure 2-6. Bolt Carrier Assembly.
Figure 2-7. Bolt Carrier Key Staking.
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2-6. PMCS. (CONT.) Item No. 7.
Item to be Inspected Bolt Assembly
Procedure Check Bolt (2) for cracks and burrs. Check Bolt Face (9) for pitting. Ensure Firing Pin Hole is round not elongated. Inspect Bolt Lugs (10) for breaks, cracks, burrs, and wear. Check Gas Rings (1) for cracks, burrs, stagger, wear. Inspect Extractor (7) for cracks and weak Extractor Spring (8b). Check for presence of O-Ring (8a) over extractor spring. Check Extractor Pivot Pin (3) for burrs, cracks, and wear. Ensure Ejector Spring Pin (4) is present. Check for cracking and deformities of extractor buffer (8c).
NOTE A chipped/broken extractor claw, weak extractor spring or impeded extractor can cause a weapon stoppage, commonly referred to as a failure to extract.
Figure 2-8. Bolt Assembly.
Check Ejector (6) for breaks or cracks. Check for weak Ejector Spring (5). NOTE A broken ejector or weak ejector spring can cause a weapon stoppage, commonly referred to as failure to eject.
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2-6. PMCS. (CONT.) Item No. 8.
Item to be Inspected Charging Handle Assembly
Procedure Inspect Charging Handle (3) for bends, breaks, cracks, and deformities. Check Charging Handle Latch (1) to ensure positive lock on upper receiver. Check Latch Spring (2) for weakness.
Figure 2-9. Charging Handle Assembly.
9.
Lower Receiver Assembly
Check Lower Receiver (2), Buttstock (1), and Pistol Grip (3) for breaks, cracks, bends, bulges, and deformities.
Figure 2-10. Lower Receiver Assembly.
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2-6. PMCS. (CONT.) Item No. 10.
Item to be Inspected Lower Receiver
Procedure Inspect the lower receiver while assembled. Inspect Takedown Pin (1) and Pivot Pin (2) for damage and retention. Check Magazine Well (3) for dents, cracks, and deformity. Check for function of Bolt Stop (4) and Magazine Release (5). Inspect Trigger Guard (6) for bends, cracks, and hinged movement.
Figure 2-11. Lower Receiver.
Check Safety (7) for cracks, burrs, and function. Check Pistol Grip (8) for looseness, burrs, cuts, and cracks.
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2-6. PMCS. (CONT.) Item No. 10.
Item to be Inspected Lower Receiver (cont.)
Procedure Inspect Trigger (3) for presence of first stage, pull weight (4.5 lbs to 5.5 lbs), and function (releases hammer when safety selector is in Semi and Full modes). Inspect Hammer (1) for bends, cracks, breaks, and function. Inspect Sear (2) for function in Semi and Auto modes.
Figure 2-12. Lower Receiver Assembly.
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2-6. PMCS. (CONT.) Item No. 11.
Item to be Inspected Buttstock Assembly
Procedure Check Buttstock (4) for breaks, cracks, and burrs. Inspect Access Door (1) to ensure it opens and closes securely. Check for burrs, cracks, and deformities. Check Buttplate Screw (6) for burrs, cracks, and tightness. Check Buttplate (3) for cracks, breaks, burrs, and tightness. Check Buttstock Screw (2) for burrs, cracks, and tightness. Check Sling Swivel (5) for burrs, cracks, and tightness. Inspect hinge (7).
Figure 2-13. Buttstock Assembly.
12.
Buffer Assembly and Action Spring
Check Buffer Assembly (3) for cracks, burrs, and deformities. Check Polyurethane Bumper (2) for damage. Check Action Spring (1) for weakness.
Figure 2-14. Buffer Assembly.
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2-6. PMCS. (CONT.) Item No. 13.
Item to be Inspected Day Optic Sight (Scope)
Procedure Check Day Optic Body (1) for bends and cracks. Check Scope Rings (7) for burrs, cracks, and tightness. Ensure that Throw Levers (6) close and lock scope to rail and that they release. Check lens and under lens caps (5) for cracks, and clarity. Check Elevation Turret (2) for positive click adjustments w/ reticle movement. Check Windage Turret (3) for positive click adjustment w/ reticle movement. Ensure Reticle Intensity Adjustment Knob (4) functions. Ensure Reticle illuminates. If reticle fails to illuminate, replace battery. Ensure Scope Ring Cap Screws (8) (x8) 7/64” are present and tight (15 in/lbs). Check for presence of Lens Caps. NOTE Look through scope to identify reticle movement.
Figure 2-15. Day Optic Sight Assembly.
NOTE Scope must be removed to check rear sight. 14.
Flip up Rear and Front Sights (Back up)
Check both Front (1) and Rear (2) sights for chips, cracks, breaks, and function (movement with positive click adjustment).
Figure 2-16. Back-up Iron Sights.
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2-6. PMCS. (CONT.) Item No. 15.
Item to be Inspected Suppressor
Procedure Check Suppressor (1) for bends, cracks, bulges, or other deformities. Also inspect internal threads (flashlight or borescope). Check "Muzzle End" (2) for strike marks or other abnormalities.
Figure 2-17. Suppressor.
16.
Bipod
Check Bipod (1) for bends, breaks, and spring weakness on legs. Ensure Push Button Spring Drive (2) extends and retracts legs. Check bipod for tightness to Bipod Adapter (3). Ensure PODLOC is secure and moves freely (4).
Figure 2-18. Bipod Assembly.
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2-6. PMCS. (CONT.) Item No. 17.
Item to be Inspected MK 12 Mod 1 SPR
Procedure Assemble weapon per Operator’s Manual (TM11416A-OR-1). Ensure parts are in good working condition.
Figure 2-19. MK 12 MOD 1 SPR
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SECTION IV. TROUBLESHOOTING 2-9.
MAINTENANCE TROUBLESHOOTING. a. This section contains troubleshooting information for locating and correcting most operating troubles, which may develop in the MK 12 MOD 1 SPR. Each malfunction for part, assembly, or sub-assembly is followed by list of test or inspections, which will help determine corrective actions to take. b. This manual cannot list all possible malfunctions that may occur, nor all tests or inspections and corrective actions. c. Knowing and understanding MK 12 MOD 1 SPR’s Cycle of Operation will help tremendously in identifying specific problems. Cycle can start or stop at any point in its continuum (Firing, Unlocking, Extracting, Ejecting, Cocking, Feeding, Chambering, and Locking). MALFUNCTION INDEX Magazine fails to lock into rifle Failure to Fire Failure to Unlock Failure to Extract Failure to Eject Failure to Cock Failure to Feed Failure to Chamber Failure to Lock Short Recoil Bolt assembly fails to lock to rear after last round Double fires or fires when selector is on safe Degraded sound/flash suppression performance Day optical sight issues
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PROCEDURE PAGE 2-15 2-16 2-18 2-19 2-20 2-21 2-21 2-22 2-22 2-23 2-24 2-25 2-26 2-26
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2-10. TROUBLESHOOTING PROCEDURES. a. MAGAZINE FAILS TO LOCK INTO RIFLE. (1) MALFUNCTION Magazine fails to lock into rifle. (a) CORRECTIVE ACTION Inspect magazine for deformities in area of locking notch.
Figure 2-20. Magazine Assembly.
(2) MALFUNCTION Dirty or corroded Magazine Catch (1). (a) CORRECTIVE ACTION Disassemble and clean (see page 2-49). (3) MALFUNCTION Defective Magazine Catch Spring (2). (a) CORRECTIVE ACTION Replace magazine catch spring (see page 2-50). (4) MALFUNCTION Worn or broken Magazine Catch (1). (a) CORRECTIVE ACTION Replace magazine catch (see page 2-50).
Figure 2-21. Magazine Catch Location.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) b. FAILURE TO FIRE. (1) MALFUNCTION Selector (1) on SAFE not SEMI or AUTO. (a) CORRECTIVE ACTION Move selector to SEMI or AUTO. If "Frozen", disassemble and clean (see page 2-63).
Figure 2-22. Selector Location.
(2) MALFUNCTION Short Firing Pin Protrusion (1) or Broken Firing Pin (2). (a) CORRECTIVE ACTION Replace firing pin.
Figure 2-23. Firing Pin Protrusion.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) (3) MALFUNCTION Broken Hammer (1). (a) CORRECTIVE ACTION Replace hammer assembly (page 2-61).
Figure 2-24. Hammer.
(4) MALFUNCTION Weak or broken Hammer Spring (1). (a) CORRECTIVE ACTION Replace hammer assembly (page 2-61).
Figure 2-25. Hammer Spring.
(5) MALFUNCTION Trigger not adjusted properly (a) CORRECTIVE ACTION Adjust trigger. (6) MALFUNCTION Hammer not cocking (see Failure to Cock for further info page 2-21). (a) CORRECTIVE ACTION Replace faulty parts.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) (7) MALFUNCTION Trigger fails to release hammer. (a) CORRECTIVE ACTION See trigger adjustment (see 2-59). (b) CORRECTIVE ACTION Replace faulty parts. c. FAILURE TO UNLOCK (1) MALFUNCTION Burred locking lugs on Bolt Assembly (1). (a) CORRECTIVE ACTION Remove burrs.
Figure 2-26. Bolt.
(2) MALFUNCTION Burred lugs on barrel extension. (a) CORRECTIVE ACTION Remove burrs.
Figure 2-27. Chamber.
(3) MALFUNCTION Failure to unlock. (a) CORRECTIVE ACTION See Short Recoil Inspection, (see page 2-23).
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) d. FAILURE TO EXTRACT (1) MALFUNCTION Chamber or ammunition dirty. (a) CORRECTIVE ACTION Clean chamber/wipe ammunition. (2) MALFUNCTION Extractor (1) and Extractor Spring Assembly (3). (a) CORRECTIVE ACTION Clean and lubricate extractor (1). (b) CORRECTIVE ACTION Replace extractor if broken or lip is chipped/worn (see page 2-43). (c) CORRECTIVE ACTION Replace Extractor Spring (3) if broken or weak. (d) CORRECTIVE ACTION Replace Extractor Spring Buffer (4) if damaged. (e) CORRECTIVE ACTION Replace Extractor Pivot Pin (5) if damaged. (f)
CORRECTIVE ACTION Replace O-ring (2) if damaged.
Figure 2-28. Extractor Assembly.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) e. FAILURE TO EJECT. (1) MALFUNCTION Ejector (2) and Ejector Spring (1). (a) CORRECTIVE ACTION Clean and lubricate ejector and ejector spring. (b) CORRECTIVE ACTION Replace ejector if broken (see page 2-44). (c) CORRECTIVE ACTION Replace ejector spring if broken or weak (page 2-43).
Figure 2-29. Ejector and Ejector Spring.
(d) CORRECTIVE ACTION Clean, and lubricate bolt assembly.
Figure 2-30. Bolt Carrier.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) (2) MALFUNCTION Check Gas Key (1) fit to Gas Tube (2). (a) CORRECTIVE ACTION Clean gas key or replace if damaged (see page 2-41).
Figure 2-31. Bolt Carrier, Bolt Carrier Key, and Gas Tube.
(3) MALFUNCTION Buffer Assembly (2) and Buffer Spring (1). (a) CORRECTIVE ACTION Clean and lubricate buffer and buffer spring (see page 2-65). (b) CORRECTIVE ACTION Replace buffer assembly if damaged (see page 2-65). (c) CORRECTIVE ACTION Replace action spring if damaged (see page 2-65).
Figure 2-32. Buffer and Buffer Spring.
f. FAILURE TO COCK. (1) MALFUNCTION Worn or broken trigger, hammer, or trigger spring. (a) CORRECTIVE ACTION Replace broken items. g. FAILURE TO FEED. (1) MALFUNCTION Magazine will not fully insert. (a) CORRECTIVE ACTION See Magazine Fails to Lock into Rifle (page 2-15). (b) CORRECTIVE ACTION See Short Recoil Test/Inspection (page 2-23).
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) (2) MALFUNCTION Inspect Buffer Assembly (2) and Action Spring (1) (a) CORRECTIVE ACTION Clean and lubricate buffer assembly and action spring. (b) CORRECTIVE ACTION Replace buffer assembly if damaged (see page 2-65). (c) CORRECTIVE ACTION Replace buffer spring if damaged (see page 2-65).
Figure 2-33. Buffer and Buffer Spring.
h. FAILURE TO CHAMBER. (1) MALFUNCTION Chamber obstructed or dirty. (a) CORRECTIVE ACTION Remove obstruction, and clean chamber. i. FAILURE TO LOCK. (1) MALFUNCTION Damaged bolt carrier key (2). (a) CORRECTIVE ACTION Repair or replace bolt carrier key and check alignment. (2) MALFUNCTION Loose Screws (1) on Bolt Carrier Key (2). (a) CORRECTIVE ACTION Disassemble and repair (see page 2-41). (b) CORRECTIVE ACTION Reassemble using new screws (see page 2-42).
Figure 2-34. Bolt Carrier.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) (3) MALFUNCTION Bent gas tube. (a) CORRECTIVE ACTION Adjust by bending tube in area of handguards. (b) CORRECTIVE ACTION Replace gas tube and check alignment. (c) CORRECTIVE ACTION See short recoil (see page 2-40). j. SHORT RECOIL. (1) MALFUNCTION Improper stagger space or worn, missing, or broken Gas Ring (1). (a) CORRECTIVE ACTION Replace gas rings, and ensure staggered gap (see page 2-46).
Figure 2-35. Bolt Assembly.
(b) CORRECTIVE ACTION Clean IAW Operator’s Manual. NOTE Ensure gas block is secure. (2) MALFUNCTION Carbon build-up in Barrel Gas Port (1). (a) CORRECTIVE ACTION Clean barrel.
Figure 2-36. Gas Block.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) k. BOLT ASSEMBLY FAILS TO LOCK TO REAR AFTER LAST ROUND. (1) MALFUNCTION Broken Bolt Catch (1). (a) CORRECTIVE ACTION Replace bolt catch (see page 2-51). (2) MALFUNCTION Broken Bolt Catch Spring (3). (a) CORRECTIVE ACTION Replace bolt catch spring. (3) MALFUNCTION Restricted movement of Bolt Catch (1). (a) CORRECTIVE ACTION Disassemble and clean. (4) MALFUNCTION Broken Bolt Catch Plunger (2). (a) CORRECTIVE ACTION Replace bolt catch plunger.
Figure 2-37. Bolt Catch Assembly.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) l. DOUBLE FIRES OR FIRES WHEN SELECTOR ON SAFE. (1) MALFUNCTION Double fires or fires when selector on safe. (a) CORRECTIVE ACTION Replace defective Selector (1) (see page 2-63). (2) MALFUNCTION Worn or broken trigger. (a) CORRECTIVE ACTION Replace trigger assembly and/or hammer assembly.
Figure 2-38. Safety Selector Lever.
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2-10. TROUBLESHOOTING PROCEDURES. (CONT.) m. DEGRADED SOUND/FLASH SUPPRESSOR PERFORMANCE. (1) MALFUNCTION Unburned granules or powder residue in Suppressor (1): (a) CORRECTIVE ACTION Soak suppressor body in a closed solvent container filled with oil free cleaning solvent overnight. After soaking overnight use hot soapy water to wash remaining chemicals from internal voids of suppressor. Use fresh hot water to rinse and final clean suppressor. Use compressed air to thoroughly dry internal area of suppressor. Lightly lubricate internal threads with CLP.
Figure 2-39. Suppressor.
n. DAY OPTICAL SIGHT ISSUES. (1) MALFUNCTION Optical sight issues. (a) CORRECTIVE ACTION Replace.
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SECTION V. MAINTENANCE PROCEDURES 2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. This task covers: INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY INITIAL SETUP Tools and Special Tools Appendix C
Personnel Required 2111 Reference Operator’s Manual
Materials/Parts Appendix B
Equipment Condition Upper Receiver Assembly, removed FRONT SIGHT INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspection - Front sight assembly for damage and function. Ensure sight will move and lock into both the down (1) and up (2) positions. If unserviceable remove and replace. b. Disassembly - Using flat head screwdriver, turn installation screw counterclockwise (CCW) (3) until front sight can be removed from ribs of rail. c. Reassembly - Place front sight "rib bar" between ribs (4); ensure that sight base is flush with ribs and not canted. Applying forward pressure to sight base, turn installation screw clockwise (CW) until tight (5).
Figure 2-40. Back-up Iron Sight Removal.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) REAR SIGHT INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Rear sight assembly for damage and function. Ensure aperture moves and locks in both up (1) and down (2) positions. Ensure rear sight aperture has positive adjustments for elevation (3) and windage (4). If unserviceable, remove and replace.
Figure 2-41. Back-up Iron Sight Inspection.
b. Disassembly (1) - Using flat head screwdriver, turn installation screw CCW until rear sight can be removed from ribs of rail. c. Reassembly (2) - Place rear sight "rib bar" between ribs; ensure that sight base is flush with ribs and not canted. Applying forward pressure to sight base, turn installation screw CW until tight.
Figure 2-42. Back-up Iron Sight Installation.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) BARREL ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Muzzle Break (1) and Suppressor Alignment Collar (2) for breaks, cracks, and tightness. Suppressor alignment collar may be secured with set screw. Ensure that collar has no movement. •
If Muzzle Break (1) or Suppressor Alignment Collar (2) is loose, damaged, and/or unserviceable, replace.
Figure 2-43. Muzzle Break and Suppressor Alignment Collar.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Handguard/rail adapter assembly for dents, cracks, bulges, and deformity of ribs. Inspect handguard nut for tightness. •
If handguard is loose, tighten nut with small strap wrench. If movement is still detected when handguard nut is tightened, remove and inspect handguard nut. If handguard is damaged, remove and replace.
b. Disassembly - Remove Day Optic - Rotate “throw levers” outward (1), and lift scope (2) up and away from upper receiver.
Figure 2-44. Scope Removal.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (1)
Place upper receiver into “upper receiver action block” (1 & 2), and secure in vice (3).
Figure 2-45. Upper Receiver Action Block.
NOTE Crush washer can not be reused. (2)
Using a crescent wrench place crescent wrench over metal strips of muzzle break and rotate CCW (looking from the barrel muzzle). Continue to rotate until muzzle break can be separated from barrel. Retain shims for future use but discard crush washer.
Figure 2-46. Muzzle Break Removal.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (3)
Disassembly - With upper receiver secured in M16 upper receiver vice block. Using small strap wrench, rotate handguard nut CCW to loosen. Looking from barrel towards receiver, use small strap wrench, rotate handguard nut CCW, facing barrel, to loosen.
Figure 2-47. Handguard Nut Removal.
c. Once loose continue to turn CCW with fingers (1) until handguard can be removed by sliding off over muzzle barrel’s end. Ensure not to lose alignment pins that are located in barrel nut’s 3 and 9 o’clock positions (2).
Figure 2-48. Handguard Nut and Alignment Pins.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (4)
Slide rail over barrel and gas block to remove (1 & 2). Remove handguard pins, located at 3 o’clock and 9 o’clock positions (3).
Figure 2-49. RAS and Alignment Pin Removal.
(5)
Using 1/16” spring pin punch and ball peen hammer, remove gas tube pin.
Figure 2-50. Gas Tube Pin Removal.
(6)
Pull gas tube rearward to separate from gas block (1 & 2).
Figure 2-51. Gas Tube Removal.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (7)
Once gas tube is separated from gas block, angle gas tube outward away from gas block and pull forward toward muzzle to remove gas tube from upper receiver.
Figure 2-52. Gas Tube Removal.
(8)
Insert combination wrench combination wrench into barrel nut (1). Rotate wrench CCW to loosen barrel nut (2).
Figure 2-53. Barrel Nut Removal.
(9)
Once barrel nut is loose, continue to rotate CCW until nut can be separated from upper receiver (1).
Figure 2-54. Barrel Removal (cont).
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (10)
Grasp barrel and pull away from upper receiver (1) until barrel is separated (2).
Figure 2-55. Barrel Removal (cont).
(11)
Slide handguard retaining nut off of barrel at chamber end (1 & 2).
Figure 2-56. Separate RAS Retaining Nut and Barrel Nut from Barrel.
(12)
Remove RAS retaining ring by sliding off of chamber end of barrel. Remove barrel nut by sliding off muzzle end of barrel.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY d. Rebarreling - Place upper receiver cartridge into receiver upper receiver action block and secure in a vice (1). DO NOT over tighten vice; this can crush or bend receiver.
Figure 2-57. RAS Components.
(1)
Place a small amount of grease (1) on interior of receiver (2) where barrel will be installed and also on exposed threads (3). From muzzle end (with flange end towards chamber) place barrel nut onto barrel. From chamber end place handguard nut over barrel nut. Ensure that threaded end of barrel nut is facing chamber end and “open” end of handguard nut is facing barrel nut (4).
Figure 2-58. Barrel Reassembly.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (2)
Insert barrel into receiver (1) ensuring that barrel alignment stud on barrel is fully seated into barrel alignment notch of receiver (2). It may be necessary to lightly strike muzzle end of Barrel with a rubber mallet to fully seat. Push barrel nut and handguard nut up to receiver and hand tighten by turning CW (3), as looking from muzzle to chamber.
Figure 2-59. Barrel Reassembly (cont).
(3)
Attach a 1/2” drive torque wrench to combination wrench (1). Torque is measured when both wrenches are used together. Place combination wrench onto the barrel nut ensuring that all three pins of combination wrench are engaged in barrel nut (2). Turn CW and torque to 30 ft/lbs (min) to 80 ft/lbs (max) (3). To accommodate “stretching” of aluminum receiver threads, loosen and re-torque Barrel Nut three times. On third time insert gas tube from back of receiver through gas tube hole. Torque barrel nut until gas tube can be moved through and out of barrel nut (4).
Figure 2-60. Gas Tube Alignment.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (4)
Gas Block and Tube Assembly - Insert gas tube into gas block ensuring that gas port holes are in line (2). Push tube into gas block until retaining pin holes are aligned (1). Using a roll pin punch (3) drive retaining pin in until flush (4).
Figure 2-61. Gas Block and Tube Assembly.
(5)
Install Gas Block / Tube on Barrel - Leaving receiver upper receiver action block in place, turn receiver upside down and secure in vice (1). Apply a light coat of oil to barrel (2). This will help gas block slide over the barrel.
Figure 2-62. Gas Block and Tube Installation.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY NOTE Ensure barrel is cleaned prior to installation of gas block and muzzle break. (6)
Install Gas Block / Tube on Barrel (cont) - Using a 3/32" Allen Wrench, remove forward set screw of gas block and slide gas block and tube onto barrel (1). Ensure that gas block is at muzzle end and gas tube is on bottom. Using brass drift punch tap gas block, on all four axis to ensure consistent movement to the rear, and tube onto barrel. Use caution to ensure that gas tube enters barrel nut cleanly and does not become damaged (2). Continue to tap gas block on until the forward set screw hole is aligned with corresponding recess of barrel (3). Apply a drop of Loctite 242 to the forward set screw and install by turning CW. Tighten until snug. DO NOT over tighten, this will strip threads. Complete this process for remaining set screw.
Figure 2-63. Gas Block Screws.
(7)
Handguard / Rail Adapter - Leaving receiver upper receiver action block in place, turn receiver right side up and secure in vice. Insert handguard alignment pins at the 3 o'clock and 9 o'clock positions of barrel nut (1). Slide handguard over barrel, threaded end first and "T" ribs up. Tighten handguard nut by turning CW (2) using strap wrench. Verify torque to 25 - 28 ft. lbs.
Figure 2-64. Alignment Pin and RAS Installation.
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2-11. UPPER RECEIVER ASSEMBLY MAINTENANCE. (CONT.) HANDGUARD/RAIL ADAPTER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (8)
Suppressor Alignment Collar - Remove alignment collar set screw and slide collar onto barrel until rearward movement stops, narrow end of collar should point towards muzzle (1). Apply a drop of Loctite 242 to the set screw. Using a 3/32" Allen Wrench, install and tighten until snug by turning CW (2). There is no indexing point for set screw or collar, just ensure collar is pushed fully on barrel until its rearward movement stops against shoulder (3).
Figure 2-65. Suppressor Alignment Collar Installation.
NOTE Crush washer cannot be reused. (9)
Muzzle Break - Slide a .0031 shim (from 7 pc shim kit in Appendix B) over muzzle of barrel followed by a crush washer with concave portion facing muzzle (1). Place muzzle break onto barrel and hand tighten (2). Note that muzzle break has two bridge portions in its mid-section. One metal bridge portion is thinner than other. Your end state will be for the thin bridge portion to be in 12 o'clock position as it relates to the weapon in its upright position. Continue to add shims until the thin bridge portion is in 11 o'clock position when hand tightened (2). This will leave you approximately 15-20 degrees of torque room left. Having this condition in place will forestall over tightening muzzle break and causing damage. Once 11 o'clock position is met, back Muzzle break off and apply Loctite 262 to threads. Place an adjustable wrench over two slots of muzzle break (most rearward position near threads for Suppressor) and tighten until thin bridge portion is in 12 o'clock position (3). Ensure that muzzle of the barrel does not protrude into the muzzle break itself, if it does add shims as necessary.
Figure 2-66. Muzzle Break Installation.
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2-12. BOLT CARRIER ASSEMBLY MAINTENANCE. This task covers: INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY INITIAL SETUP Tools and Special Tools Appendix C
Personnel Required 2111 Reference Operator’s Manual
Materials/Parts Appendix B
Equipment Condition Upper Receiver Assembly Removed Bolt disassembled BOLT CARRIER INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Bolt carrier for breaks, cracks, bulges, and other deformities. (1)
If damaged or unserviceable, remove and replace.
Figure 2-67. Bolt Carrier.
b. Inspect - Carrier key for bends and breaks. Check "mouth" (2a) of carrier key for burrs and deformities. If damaged or unserviceable, remove and replace. c. Disassembly - Using 1/8" Allen Wrench, turn carrier key screws CCW (1) and remove carrier key (2).
Figure 2-68. Bolt Carrier Key.
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2-12. BOLT CARRIER ASSEMBLY MAINTENANCE. (CONT.) BOLT CARRIER (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY d. Reassembly - Using new carrier screws, line up screw holes of carrier key with carrier (1), assemble, tightening to 35 in/lbs (2), and stake using center punch (3).
Figure 2-69. Bolt Carrier Key and Screws.
NOTE Make sure you stone the sides of key to remove dimples from staking. e. Disassembly - Pull out firing pin retaining pin with punch or fingernail. f. Inspect - Firing Pin Retaining Pin (1) for breaks, cracks, and other deformities. (1)
If damaged or unserviceable remove and replace.
g. Reassembly - Insert firing pin retaining pin into bolt carrier ensuring it captures head of firing pin. Shake bolt carrier to ensure firing pin will not fall out.
Figure 2-70. Firing Pin Retaining Pin.
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2-13. BOLT MAINTENANCE. This task covers: INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY INITIAL SETUP Tools and Special Tools Appendix C
Personnel Required 2111 Reference Operator’s Manual
Materials/Parts Appendix B
Equipment Condition Bolt separated from bolt carrier BOLT INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Bolt for breaks, cracks, bulges, and other deformities. (1)
Inspect bolt lugs for cracks and deformities.
(2)
Inspect firing pin hole for deformities.
(3)
If damaged or unserviceable, remove and replace. Check headspace if bolt is replaced.
Figure 2-71. Bolt Assembly.
b. Inspect - Extractor for breaks, burrs, and function. Use brass punch to test tension on spring. (1)
If damaged or unserviceable, remove and replace.
Figure 2-72. Extractor Inspection.
c. Disassembly - Apply inward pressure to rear of extractor, punch Pivot Pin (1) out with punch and remove extractor.
Figure 2-73. Extractor Removal.
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2-13. BOLT MAINTENANCE. (CONT.) BOLT (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY d. Repair - Replace all authorized unserviceable items. Retest all replaced items. Items that have been replaced will then follow reassembly procedures e. and h. e. Reassembly - Insert extractor into bolt and apply pressure to rear of extractor. With continued pressure on rear of extractor insert pivot pin (1) pushing it to a point below flush (2).
Figure 2-74. Extractor Installation.
WARNING Ejector is under spring tension; failure to have Bolt Face down will result in flying parts and possible injury. f. Inspect - Ejector for breaks and burrs. Push in on ejector with brass punch to check ejector spring for tension. (1)
If damaged or unserviceable, remove and replace.
g. Disassembly - Using 1/16" punch and ball peen hammer, drive Ejector Retaining Pin (a) from bolt (1). With punch still in retaining pin hole place bolt face down onto a workbench and slowly remove punch allowing ejector and spring to separate from bolt (2).
Figure 2-75. Ejector Removal.
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2-13. BOLT MAINTENANCE. (CONT.) BOLT (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY h. Reassembly - With bolt face down, tap bolt on work bench to remove residual matter. Apply very light coat of CLP to ejector spring. Insert spring then ejector into cutout (1) on face of bolt, and ensure that recessed portion of ejector is facing retaining pin holes (2). Secure punch in vice. Push face of Bolt over punch to compress spring and ejector. Insert 1/16" punch into retaining pin hole just far enough to secure ejector (3). Using roll pin punch, drive retaining pin in from opposite side of punch until pin captures ejector (4). Using 1/16" punch, finish driving pin to a point just below flush (5). If ejector retaining pin is damaged, replace.
Figure 2-76. Ejector Installation/Inspection.
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2-13. BOLT MAINTENANCE. (CONT.) BOLT (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY i. Inspect - Gas Rings for cracks, burrs, or breaks. NOTE If one gas ring is bad, all must be replaced as a set. (1)
If gas rings are unserviceable, replace.
j. Disassembly - Using small punch or jeweler screwdriver pry underneath one end of top gas ring, “roll” it out of gas ring slot (1), and remove it from bolt (2). Complete same process for remaining gas rings. k. Reassembly - Lay one end of gas ring into gas ring slot (3), hold that end with one finger, and follow gas ring to other end "rolling" gas ring onto bolt (4). Complete this process for remaining gas rings. Ensure that gas ring slots are staggered and not stacked on one another as shown in figure (5).
Figure 2-77. Gas Rings.
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2-14. CHARGING HANDLE MAINTENANCE. This task covers: INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY INITIAL SETUP Tools and Special Tools Appendix C
Personnel Required 2111 Reference Operator’s Manual
Materials/Parts Appendix B
Equipment Condition Charging handle separated from upper receiver CHARGING HANDLE INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Charging handle for burrs, cracks, breaks, and charging handle latch for function and spring tension. If Charging Handle Leg (a) is damaged, a new charging handle assembly must be ordered. If Latch (2), Charging Handle Pin (1), or Spring, is damaged or unserviceable, they can be replaced as individual components. NOTE Although the MK 12 MOD 1 charging handle latch is equipped with gas buster latch versus standard latch. Disassembly and reassembly procedures are the same as for a standard M16 System.
Figure 2-78. Charging Handle Assembly.
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2-14. CHARGING HANDLE MAINTENANCE. (CONT.) CHARGING HANDLE (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY b. Disassembly - Lay charging handle on armorer’s bench block, and using 1/16" punch drive charging handle pin out (1) leaving punch in place. Apply slight inward pressure to charging handle latch and remove punch (2). Slowly relieve pressure on charging handle latch allowing it to separate from charging handle. Use punch to remove spring if it will not fall out freely (3).
Figure 2-79. Charging Handle Disassembly.
c. Reassembly - Place latch spring into charging handle (1). Insert latch into charging handle, and compress spring to align charging handle pin holes (2). Insert 1/16" punch just far enough into holes to capture latch (3). Insert pin into opposite side driving it until it can retain latch (4). Remove punch and drive charging handle pin in flush.
Figure 2-80. Charging Handle Reassembly.
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2-15. LOWER RECEIVER MAINTENANCE. This task covers: INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY INITIAL SETUP Tools and Special Tools Appendix C
Personnel Required 2111
Materials/Parts Appendix B
Reference Operator’s Manual Equipment Condition Separated Lower Receiver
MAGAZINE CATCH RELEASE INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Magazine Catch/Release for breaks, cracks, and burrs. Inspect magazine catch for function by fully inserting good empty magazine into magazine well. Attempt to pull magazine free from magazine well; you should not be able to. Now inspect for release function by depressing magazine release button, magazine should fall free from magazine well. b. Disassembly - Use punch (2) to push in Magazine Release Button (1) and rotate Magazine Catch CCW (3) until it can be separated from receiver. Use caution as magazine catch/release is under spring tension.
Figure 2-81. Magazine Catch Disassembly.
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2-15. LOWER RECEIVER MAINTENANCE. MAGAZINE CATCH RELEASE (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY c. Reassembly - Insert magazine catch spring into release button cutout (1), place magazine release button (a) over spring, and hold in place. Insert threaded arm of magazine catch into receiver (2), and rotate CW while pushing in magazine release button. Continue to turn magazine catch CW until contact is made with receiver during rotation. Once this has been achieved, allow magazine catch to come to rest in its respective cutout on receiver. (1) Insert magazine into magazine well, and check for function. Turn magazine catch CW or CCW one revolution for adjustment. Continue turning CW until it is flush with release button face.
Figure 2-82. Magazine Catch and Button.
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2-15. LOWER RECEIVER MAINTENANCE. BOLT CATCH RELEASE INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - bolt catch/release for breaks, cracks, and function. To check function, check for spring tension. (1) If bolt catch is unserviceable, remove and replace. b. Disassembly - Using 1/16” punch, drive out bolt catch pin spring freeing bolt catch (1). Maintain control of bolt catch; it is under spring tension (2). (1) Remove and separate (3) Bolt Catch (a), Spring (b), and Plunger (c).
Figure 2-83. Bolt Catch Disassembly.
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2-15. LOWER RECEIVER MAINTENANCE. BOLT CATCH RELEASE (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY c. Reassembly - Insert spring followed by plunger into receiver (1). Place bolt catch into receiver and align holes (2). Using roll pin punch drive spring pin in until it captures bolt catch (3). Finish driving pin with a punch until flush (4).
Figure 2-84. Bolt Catch Reassembly.
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2-15. LOWER RECEIVER MAINTENANCE. PIVOT PIN INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Pivot pin for breaks, cracks, and deformities. Pin should not fall freely from lower receiver. (1) If pivot pin is damaged or unserviceable, remove and replace. b. Disassembly - Use special tool (see Appendix C), punch, or small screwdriver to depress detent (1) in towards receiver (2). Once detent is depressed turn pivot pin in either direction to forestall detent catching in pivot pin detent slot. Slowly pull pivot pin from receiver. Use caution as detent is under spring tension.
Figure 2-85. Pivot Pin Disassembly.
(1) (2)
Detent (1) and Detent Spring (2) can now be removed from receiver. Replace detent and detent spring if damaged or unserviceable.
Figure 2-86. Pivot Pin Detent and Spring.
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2-15. LOWER RECEIVER MAINTENANCE. PIVOT PIN (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY c. Reassembly - Place detent spring into receiver (1), and lay detent forward of spring (2). Insert detent installation tool from left side into detent hole, and capture detent as it is pressed into receiver (3). Rotate tool so angled edge is away from receiver, and slowly replace with pivot pin (4 & 5). Rotate pin so that detent is captured in slot of pivot pin (6).
Figure 2-87. Pivot Pin Reassembly.
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2-15. LOWER RECEIVER MAINTENANCE. PISTOL GRIP INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Pistol grip (1) for breaks, cracks, burrs, and other deformities. (1) If pistol grip (1) is damaged or unserviceable, remove and replace. b. Disassembly - Using a long, large flat tip screwdriver, turn pistol grip screw (2) CCW to loosen and remove.
Figure 2-88. Pistol Grip Removal.
(1)
With bottom of pistol grip rearward facing up slowly pull it from receiver (1). As you remove pistol grip you will see that a detent spring is now exposed (a). Image of pistol grip and corresponding parts removed (2).
Figure 2-89. Pistol Grip Inspection.
(2)
Pull pistol grip off of receiver. Rotate weapon, right side up, so spring and detent can fall free from receiver.
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2-15. LOWER RECEIVER MAINTENANCE. PISTOL GRIP (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY c. Reassembly - Insert Detent into receiver (1) and spring into pistol grip (2). Position pistol grip onto receiver (3) ensuring that spring is aligned with detent. Press pistol grip completely onto receiver. Insert pistol grip screw with lock washer and tighten (4). Use caution as over tightening grip screw can strip threads of receiver.
Figure 2-90. Pistol Grip Installation.
(1)
Ensure that reinstalled pistol grip does not move when installed.
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2-15. LOWER RECEIVER MAINTENANCE. TRIGGER GUARD INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - trigger guard (1) for bends, cracks, and burrs. Ensure that trigger guard retaining detent can be depressed (2) and that trigger guard (3) will pivot.
Figure 2-91. Trigger Guard Inspection.
NOTE If trigger guard fails to pivot, check to ensure that receiver is not bent or crushed where trigger guard attaches. If receiver is bent DO NOT ATTEMPT TO BEND IT BACK IN PLACE; entire weapon is unserviceable and must be evacuated to depot level maintenance. (1)
If trigger guard is damaged or unserviceable, remove and replace.
b. Disassembly - Using bench block to keep from breaking or crushing receiver where trigger guard attaches, use punch and ball peen hammer (1) drive trigger guard roll pin out (2).
Figure 2-92. Trigger Guard Removal.
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2-15. LOWER RECEIVER MAINTENANCE. TRIGGER GUARD (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (1) Once roll pin is driven completely out of receiver, depress retaining detent in allowing trigger guard to be separated from receiver (1).
Figure 2-93. Trigger Guard Assembly.
c. Reassembly - Place trigger guard into receiver by depressing retaining detent with punch and sliding it back into hole forward of trigger. Rotate opposite end of trigger guard back into receiver (1) aligning holes. Use armorer’s bench block to support receiver, insert roll pin driving it in flush with receiver (2).
Figure 2-94. Trigger Guard Installation.
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2-15. LOWER RECEIVER MAINTENANCE. TRIGGER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - trigger group for function and damage. Trigger is a two stage trigger. First stage is movement of trigger rearward prior to engaging disconnector and sear (take up). Second stage begins at end of stage one, where pressure rearward on trigger must be increased in order for disconnector to function and release hammer. This is measured in pounds and should be between 3.5 lbs and 4.5 lbs. Process of measuring trigger pull weight is detailed in gaging section of this manual. If trigger pull weight is not within tolerance or if trigger is absent in first stage, attempt to adjust back into specification. If trigger cannot be adjusted back into specification, remove and replace. NOTE Adjustment of the KAC Two-Stage Full-Auto Trigger is more involved than adjusting a semi-auto only trigger. When using any Loctite primer or adhesive, read manufacturers instructions on cure times. Setscrews must have a snug fit. Constant adjustments of setscrews will cause them to loose there snug fit. b. Adjustment (1)
Install the trigger assembly, with a short pilot pin, into the weapon. Install trigger pin by aligning trigger assembly hole with receiver hole and inserting trigger pin pushing out the pilot pin from right to left until flush. Pilot pin can be retained for future use.
(2)
Install hammer (PN 22362) (long legs of hammer spring (94025) lay on top of trigger pin). Insert hammer pin from right to left until flush.
(3)
Apply Loctite No. 7471 to setscrews (PN 21037). Allow this to dry for 5 minutes. Then apply Loctite No. 277 to the threads of the setscrews. Re-install the coated setscrews (PN 21037) into the front and rear hooks.
(4)
Adjust both setscrews fully clockwise gently. With selector on “SEMI” adjust front hook setscrew counter clockwise until the hammer will lock back. Do not force.
(5)
Adjust rear hook setscrew counter clockwise until it engages the hammer just prior to the front hooks release.
(6)
Lock the hammer (PN 94185) to the rear; rotate the selector to “fire” or “semi”. Pull the trigger through the first stage continuing on through the second stage should be smooth until the second stage engages. The second stage should be a “snap” release. Rotating the front hook setscrew (21037) clockwise will increase trigger wight and introduce creep. Counterclockwise will decrease trigger weight and creep. Trigger over travel and wight may be adjusted with the rear hook setscrew (PN 21307) (clockwise = less, counterclockwise = more).
(7)
With the selector on “AUTO” fully depress hammer. The sear should engage the hammer. Push the sear forward to disengage. Hammer should release only to the point of engaging the front of the sear forward to disengage. Hammer should release only to the point of engaging the front hook. Pulling the trigger should release the hammer completely.
(8)
Place trigger on trigger pull scale. Test breaking weight; adjust to 4.5 lbs in “SEMI” position. 2-59
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2-15. LOWER RECEIVER MAINTENANCE. TRIGGER ASSEMBLY INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY
Figure 2-95. Trigger Assembly.
CAUTION Use caution when removing parts. Both parts are under spring tension; maintain receiver in position that will prevent parts from flying. c. Disassembly - Hammer must be removed to access trigger. Replace both hammer and trigger as a group even if only one is unserviceable. Using 1/16" punch, drive out hammer pin and trigger pin removing both from receiver.
Figure 2-96. Lower Receiver.
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2-15. LOWER RECEIVER MAINTENANCE. TRIGGER ASSEMBLY (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY CAUTION A new trigger assembly is held together with a pilot pin. Do not remove pilot pin or trigger assembly components will separate. NOTE New trigger assembly will come with pilot pin. Retain pin for future use. See Appendix C for fabricated pin. d. Reassembly - Insert trigger into receiver, ensuring that spring legs are facing forward, and align with trigger pin holes of receiver (1). Holding trigger group in place, insert trigger pin into receiver and push through till flush (2). This will replace pilot pin with actual trigger pin. It may be necessary to strike pin with a rubber mallet to get into place. Pin should be flush on both sides of Receiver (3).
Figure 2-97. Trigger Assembly Installation.
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2-15. LOWER RECEIVER MAINTENANCE. TRIGGER ASSEMBLY (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY e. Reassembly (cont.) - Insert hammer into receiver ensuring that hooks are facing rear (1) and that hammer spring legs are facing rear and compressed over top of trigger pin (2). Align hammer pin holes of receiver with hammer and insert pin (3). Push pin until flush on both sides (4). It may be necessary to strike pin with rubber mallet to finish installation.
Figure 2-98. Hammer Assembly Installation (cont).
(1)
Once installation is complete refer to ADJUSTMENT (page 2-59) section for setting trigger.
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2-15. LOWER RECEIVER MAINTENANCE. SAFETY SELECTOR INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - safety selector for breaks, cracks, and burrs. Ensure that safety selector moves and functions in Semi, Auto, and Safe positions. (1) Safe Position - With lower receiver separated from upper receiver and thumb over hammer, depress trigger (1). Hammer should not release from disconnector, and move forward. CAUTION Do not allow hammer to fall freely. This can damage Hammer and Receiver. Keep thumb over Hammer. (2) Semi Position - With lower receiver separated from upper receiver and placing your thumb over hammer, depress trigger (2). Hammer should release from disconnector, and move forward. Push sear forward in auto position to allow disengagement. (3) Auto Position - With lower receiver separated from upper receiver and placing your thumb over hammer, depress trigger (2). Hammer should release from disconnector, and move forward. Push auto sear forward in auto position to allow disengagement.
Figure 2-99. Function Check.
(4) (5)
If safety selector does not function or is broken, remove and replace. Pistol grip must be removed to access selector detent and spring, which in turn allows disassembly of selector. See pistol grip disassembly for further instructions and illustrations (see page 2-55). b. Disassembly - With pistol grip removed, turn receiver right side up allowing selector detent to fall from receiver; be cautious not to lose detent. Once detent is removed, grasp selector with fingers and remove it from receiver. c. Reassembly - Place selector into left side of receiver, and reassemble following pistol grip reassembly instructions. (see page 2-56)
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2-15. LOWER RECEIVER MAINTENANCE. BUFFER AND BUFFER SPRING INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - buffer (1) for chips, cracks, and burrs. Pay particular attention to Head (a) of buffer for chips, breaks, and wear. Ensure that Polyurethane Bumper (b) is not damaged. WARNING Buffer/spring is under spring tension; unintentional release will result in flying parts and possible injury. (1)
If damaged or unserviceable, remove and replace complete buffer.
Figure 2-100. Buffer.
b. Disassembly - Ensure hammer is in cocked position and depress buffer retainer (a) allowing buffer and spring to separate from buffer tube (b). Buffer is under heavy spring tension; maintain thumb over buffer as you depress detent.
Figure 2-101. Buffer Assembly Removal.
NOTE DO NOT STRETCH SPRING to gain compliance with length specification. c. Inspect - spring for damage and strength. Buffer spring should be between 11 3/4" - 13 1/2" (1). (1) If spring is damaged or unserviceable, remove IAW buffer disassembly instructions (above) and replace.
Figure 2-102. Buffer Spring.
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2-15. LOWER RECEIVER MAINTENANCE. BUFFER AND BUFFER SPRING (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY d. Reassembly - Place buffer into buffer spring (1), insert both into buffer tube compressing buffer into buffer tube until it snaps over buffer retainer (2).
Figure 2-103. Buffer Retainer.
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2-15. LOWER RECEIVER MAINTENANCE. BUTTSTOCK/TAKEDOWN PIN/SPRING/DETENT INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - Buttstock for breaks and cracks. (1) If buttstock is damaged or unserviceable, remove and replace. b. Disassembly - Using screwdriver, turn buttstock screw (top screw) CCW (1) to loosen and remove. Slowly start to slide buttstock off of buffer tube and you will see takedown pin detent spring (2). Use caution not to lose spring. Once buttstock is removed (3). Takedown Pin Detent (a), Spring (b) and Takedown Pin (c) can be removed. CAUTION Catch helical spring, detent and takedown pin to prevent loss. (1)
Using a combination wrench place square notch of combination wrench over square protrusion of lower receiver extension. Attach a square drive wrench to combination wrench and rotate CCW. Once loose place hand over buffer retaining detent and continue to rotate lower receiver extension CCW. Detent and spring can now be received. Continue CCW turn on lower receiver extension until it can be removed.
Figure 2-104. Buttstock Removal.
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2-15. LOWER RECEIVER MAINTENANCE. BUTTSTOCK INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY NOTE Ensure buttstock does not move. a. REASSEMBLY - Install spring and buffer retaining pin detent into receiver. Compress detent with thumb and thread on lower receiver extension until hand tight. Using a combination wrench in conjuction with a ft lb torque lower receiver extension 35 to 39 ft lbs. (1)
Install takedown pin (1). Insert detent (2), followed by spring (3) into receiver. Place buttstock over buffer tube, and slide into place, ensure spring is aligned and not binding (4). Replace buttstock screw and turn CW to tighten (5). DO NOT OVER TIGHTEN; this will strip lower receiver extension.
Figure 2-105. Buttstock Installation.
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2-15. LOWER RECEIVER MAINTENANCE. BUTTSTOCK/BUTTPLATE INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY a. Inspect - buttplate for cracks, burrs, and breaks. Check thumb door for movement and function. (1) If buttplate is damaged or unserviceable, remove and replace. b. Disassembly - Using screwdriver, rotate buttstock screw and buttplate screw CCW to loosen and remove. Once both screws are removed the buttplate and sling swivel can be separated from the buttstock. To remove thumb door press down on thumb door locking latch and remove. To remove thumb door hinge press thumb door hinge plate out and separate. NOTE When buttplate is removed the following components will be accessible for further inspection or maintenance if necessary.
Figure 2-106. Buttplate Assembly.
c. Reassembly - Push buttplate onto rear of buttstock ensuring that square cutout for hinge is on bottom.
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2-15. LOWER RECEIVER MAINTENANCE. BUTTSTOCK/BUTTPLATE (CONT.) INSPECTION/DISASSEMBLY/REPAIR/REASSEMBLY (1) To reassemble thumb door, align pin holes of hinge with pin holes of thumb door and insert hinge pin by simply pushing it in place (1). Slide hinge behind the buttplate ensuring that hinge will be captured by buttplate screw when it is installed (2).
Figure 2-107. Buttplate Inspection.
(2)
Insert sling swivel into buttstock so that bend of swivel is towards muzzle end. Insert buttplate screw into buttplate and rotate CW to tighten. Ensure that buttplate screw has captured hinge and sling swivel (3).
Figure 2-108. Buttplate Installation.
CAUTION Do not over tighten. (3)
Complete buttplate reassembly IAW stock reassembly (see page 2-66). Place buttstock over buffer tube, and slide into place (1). Place spacer onto buffer tube and slide into place. Replace buttstock screw, and turn CW to tighten (2).
Figure 2-109. Buttplate Installation (cont).
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CHAPTER 3 UNIT MAINTENANCE GAGING INSTRUCTIONS CHAPTER OVERVIEW This chapter contains information regarding gaging requirements and procedures for MK 12 MOD 1. SECTION I. REQUIRED GAGES AND GAGING REQUIREMENTS 3-1. REQUIRED GAGES.
3-2.
a.
Barrel Straightness Gage (8448202)
b.
Headspace Gage (PN 7799734)
c.
MK 12 MOD 1 Firing Pin Protrusion Gage (PN 7799735)
d.
Firing Pin Hole Plug Gage (PN 12620101)
e.
Trigger Pull Fixture. GAGING REQUIREMENTS.
Gaging inspections shall take place prior to and immediately after operational deployments and quarterly. Gaging will be completed as part of troubleshooting process when investigating weapon malfunctions or when critical parts are replaced or repaired (i.e. replacement of firing pin). Gaging will be conducted by qualified 2111. 3-3.
GENERAL.
Safety dictates that critical tolerance instances be measured via gages in order to prevent catastrophic failure of MK 12 MOD 1. Failure to comply with gaging requirements can create condition where weapon can fire out of "battery" or fail to fire at critical moment. In either condition, serious injury or loss of life can result.
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SECTION II. GAGING PROCEDURES
3-4.
UPPER RECEIVER ASSEMBLY.
Required Gages Barrel Straightness Gage (8448202)
Personnel Required 2111
Equipment Condition Assembled MK 12 MOD 1 BARREL STRAIGHTNESS
a. Check barrel straightness using straightness gage 8448202. Put gage in barrel, tilt barrel, and allow gage to fall through. Catch gage as it falls through. b. Gage must pass freely through barrel with suppressor attached. If the gage does not pass through the barrel and suppressor remove suppressor and gage barrel alone. c. If the barrel or suppressor is defective replace.
p
Figure 3-1. Barrel Straightness Gage.
Figure 3-2. Barrel Straightness Gage (cont)
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3-5.
UPPER RECEIVER ASSEMBLY.
Required Gages Headspace Gage (PN 7799734)
Personnel Required 2111
Equipment Condition Assembled MK 12 MOD 1 HEADSPACE
WARNING Ensure Weapon is unloaded prior to Gaging. a. Clean barrel and chamber IAW Operator’s Manual (TM 11416A-OR/2). Gaging procedures will not work on weapon with a dirty chamber and/or barrel. b. Insert Headspace Gage (Figure 3-4) into chamber. While holding onto charging handle, slowly let bolt go forward. Bolt should not lock up into the “Chambered” position (Figure 3-5). c. If bolt locks up with Headspace Gage inserted, then chamber is out of headspace; reject weapon and replace bolt and barrel as a set.
Figure 3-3. Headspace Gage.
Figure 3-4. “Chambered Position”.
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3-6.
BOLT/BOLT CARRIER ASSEMBLY.
Required Gages MK 12 MOD 1 Firing Pin Protrusion Gage (PN 7799735)
Personnel Required 2111
Equipment Condition Bolt/Bolt Carrier Separated from Receiver FIRING PIN PROTRUSION WARNING Ensure Weapon is unloaded prior to Gaging. a. Clean bolt and carrier IAW Operator’s Manual. b. Hold bolt carrier with bolt face pointing up and bolt in “locked / down” position. Insert finger through slot in bolt carrier, and push firing pin up until it is exposed fully through firing pin hole of bolt face (Figure 3-8). c. Note that firing pin protrusion gage (Figure 3-9) has a Min. side and a Max. side. With gage vertical to bolt face and making continuous contact with bolt face, slide Min. notch over firing pin (Figure 3-10). Feel for contact between Min. notch of gage and firing pin. Contact need not be substantial but present. If no contact is noted, firing pin protrusion is too short. (1) If contact is not present, ensure both bolt and firing pin are clean and retry. If after cleaning contact is still not noted, replace firing pin and test again. You may need to replace both bolt and firing pin. If bolt is replaced YOU MUST gage headspace.
Figure 3-6. Firing Pin Protrusion Gage.
Figure 3-5. Firing Pin Protruding through Bolt Face.
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3-6.
BOLT/BOLT CARRIER ASSEMBLY. (CONT.)
Required Gages MK 12 MOD 1 Firing Pin Protrusion Gage (PN 7799735) Same as M16 Series
Personnel Required 2111
Equipment Condition Bolt/Bolt Carrier Separated from Receiver FIRING PIN PROTRUSION (CONT.) WARNING Ensure Weapon is unloaded prior to Gaging.
d. Follow same procedure as above with Max. side of gage. While moving Max. side of gage, contact must not be felt. If contact is made between Max. notch and firing pin then protrusion is too long. (1) If contact is made between Max. notch and firing pin then protrusion is too long. Replace firing pin and test again. You may need to replace both bolt and firing pin. If bolt is replaced YOU MUST gage headspace.
Figure 3-7. Slide Min. Notch Over Firing Pin.
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3-6.
BOLT/BOLT CARRIER ASSEMBLY. (CONT.)
Required Gages Firing Pin Hole Plug Gage (PN 12620101) Same as M16 Series
Personnel Required 2111
Equipment Condition Bolt/Bolt Carrier Separated from Receiver FIRING PIN HOLE WARNING Ensure Weapon is unloaded prior to Gaging.
NOTE Bolts that have elongated or oversized holes that permit special no-go plug gage to penetrate fully at any position on the circumference of the firing pin hole will be replaced. NOTE Large diameter portion of firing pin should contact rear of bolt. a. Test firing pin hole for elongated and oversize holes. b. Using firing pin protrusion gage 7799735, check for proper firing pin protrusion. c. Insert firing pin through bolt assembly.
Figure 3-8. Firing Pin Hole Plug Gage.
Figure 3-9. Firing Pin Hole.
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3-7.
TRIGGER GROUP
Required Gages Trigger Pull Fixture Equipment Condition Assembled MK 12 TRIGGER PULL WEIGHT
Personnel Required 2111
WARNING Ensure Weapon is unloaded prior to Gaging.
a. Clear the weapon. b. Place selector to SEMI. Hold weapon in vertical position. Using trigger pull measuring fixture, 7274758, add weights until hammer trips. Determine weight applied. c. Hammer must not trip when 4.5 lbs. is applied, hammer must trip when applying 5.5 lbs. NOTE This image is of an M4. Procedure for attaching gage are the same.
Figure 3-10. Trigger Pull Fixture.
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APPENDIX A REFERENCES Consult the following publication indexes frequently for latest changes or revisions of references and for new publications relating to material covered in this manual. A-1. TECHNICAL MANUALS. TM11416A-OR-1
Operator's Manual
TM 750-24-7
Procedures for Destruction of Equipment to Prevent Enemy Use.
TI 8005-24/20
Pre-fire inspection, small arms weapons, ordnance material
MK 12 MOD 1 SPR
A-2. DEPARTMENT OF DEFENSE REGULATIONS. DoD 4160-21-M-1
Defense Demilitarization Manual
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APPENDIX B MAINTENANCE REPAIR PARTS B-1.
SCOPE.
This appendix lists and authorizes spares and repair parts; special tools; special test measurement, and diagnostic equipment (TMDE); and other special support equipment required for performance of organizational and intermediate maintenance of the MK 12 MOD 1 SPR. It authorizes the requisitioning, issue, and disposition of spares, repair parts, and special tools as indicated by the Source, Maintenance and Recoverability (SMR) codes. B-2.
GENERAL.
This Repair Parts and Special Tools List (RPSTL) is divided into the following sections: a. Section II. Repair Parts List. A list of spares and repair parts authorized by this RPSTL for use in the performance of maintenance. The list also includes parts which must be removed for replacement of the authorized parts. Parts lists are composed of functional groups in ascending alphanumeric sequence, with the parts in each group listed in ascending figure and item number sequence. Bulk material are listed in NSN sequence. b. Section III. Special Tools List. A list of special tools, special TMDE, and other special support equipment authorized by this RPSTL for the performance of maintenance. c. Section IV. National Stock Number and Part Number Index. A list, in National Item and Identification Number (NIIN) sequence, of all national Stock Numbers (NSN) appearing in the listings, followed by a list in alphanumeric sequence of all part numbers appearing in the listings. National stock numbers and parts numbers are crossed-referenced to each illustration figure and item number appearance. B-3.
EXPLANATION OF COLUMNS. a. ILLUSTRATION (Column (1)). This column is divided as follows: (1)
(a) FIG NO. Figure number. Indicates the figure number illustrating an exploded view of a functional group. (b) ITEM NO. Indicates the number used to identify items called out in the illustration.
b. SMR CODE (Column (2)). The Source, Maintenance, and Recoverability (SMR) code is a 5-position code which provides requisitioning, maintenance level authority, and maintenance level disposal authority information and is further described in the following:
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Source Code
Maintenance Code
Recoverability Code
XX
X
1st two XX
positions
How you get item
3rd position
4th position
Who can install, replace, or use item
Who can do complete repair* on item
Who determined disposition action on unserviceable item
*Complete Repair: Maintenance capacity, capability, and authority to perform all the corrective maintenance tasks of the “Repair” function in a use/user environment in order to restore serviceability to a failed item. (1)
Source Code. The Source code tells you how you get an item needed for maintenance, repair, or overhaul of an end item/equipment. Source codes are always the first two positions of the SMR code. Explanations of source codes follow:
Code PA PB PC PD PE PF PG
Explanation
Stocked items; use the applicable NSN to request/requisition items with these source codes. They are authorized to the category indicated by the code entered in the 3rd position of the SMR code. The complete kit must be requisitioned and applied.
KD KF KB
Items with these codes are not to be requested/requisitioned individually. They are part of a kit which is authorized to the maintenance category indicated in the 3rd position of the SMR code. The complete kit must be requisitioned and applied.
MO-(Made at Org/AVUM Category) MF-(Made at INTMD/AVIM) MD-(Made at Depot)
Items with these codes are not to be requested/requisitioned individually. They must be made from bulk material which is identified by NSN in the Description column and listed in the Bulk Material group in the repair parts list in this appendix. If the item is authorized to you by the 3rd position code of the MSR code, but the source code indicates it is made at a higher category, order the item from the higher category of maintenance.
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Code AO-(Assembled by Orf/AVUM Category) AF-(Assembled by INTMDA/ AVIM Category) AD-(Assembled b Depot) XA
Explanation Items with these codes are not to be requested/requisitioned individually. The parts that make up the assembled item must be requisitioned or fabricated and assembled at the category of maintenance indicated by the source code. If the 3rd position code of the SMR code authorizes you to replace the item, but the source code indicates the item is assembled at a higher category, order the item from the higher category of maintenance.
XB
If an “XB” item cannot be obtained from salvage, order it using the FSCM and part number given.
XD
Item is not stocked. Order an “XD” coded item through normal supply channels using the FSCM and part number given, if no NSN is available
Do not requisition an “XA” coded item. Order its next higher assembly. (Also, refer to the NOTE below)
NOTE Cannibalization or controlled exchange, when authorized, may be used as a source of supply for items with the above source codes, except for those source coded “XA”. (2)
Maintenance code. Maintenance codes tell you the category (s) of maintenance authorized to USE and REPAIR support items. The maintenance codes are entered in the third and fourth positions of the SMR Codes as follows: (a) The maintenance code entered in the third position tells you the lowest maintenance category authorized to remove, replace, and use an item. The maintenance code entered in the third position will indicate authorization to one of the following categories of maintenance.
Code C
Explanation Crew or operator maintenance done within organizational or aviation unit maintenance.
O
Organizational or aviation intermediate category can remove, replace, and use the item.
F
Intermediate or aviation intermediate category can remove, replace, and use the item.
L
Specialized repair activity can remove, replace, and use the item.
D
Depot category can remove, replace, and use the item. (b) The maintenance code entered in the fourth position tells you whether or not the item is to be repaired and identifies the lowest maintenance category with the capability to do complete repair (i.e., perform all authorized repair functions.) (NOTE: Some limited repair may be done on the item at a lower category of main ten ace, if authorized by the Maintenance Allocation Chart (MAC) and SMR codes.) This position will contain one of the following maintenance codes.
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Code O
Explanation Organizational or aviation unit is the lowest category that can do complete repair of items.
F
Intermediate or aviation intermediate is the lowest category that can do complete repair of the item.
L
Specialized repair activity is the lowest category that can do complete repair of the item.
D
Depot is the lowest category that can do complete repair of the item.
Z
Nonreparable. No repair is authorized.
B
No repair is authorized. (No parts or special tools are authorized for the maintenance of a “B” coded item). However, the item may be reconditioned by adjusting, lubricating, etc., at the user level. (3)
Recoverability code. Recoverability codes are assigned to items to indicate the disposition action on unserviceable items. The Recoverability code is entered in the fifth position of the SMR Code as follows:
Recoverability Code Z
Definition Nonreparable item. When unserviceable, condemn and dispose of the item at the category of maintenance shown in 3rd position of SMR Code.
O
Reparable item. When uneconomical reparable, condemn and dispose of the item at organizational or aviation unit category.
F
Reparable item. When uneconomical reparable, condemn and dispose of the item at the intermediate or aviation intermediate category.
D
Reparable item. When beyond lower category repair capability, return to depot. Condemnation and disposal of item not authorized below depot category.
L
Reparable item. Condemnation and disposal not authorized below specialized repair activity.
A
Item requires special handling or condemnation procedures because of specific reasons (i.e., precious metal content, high solar value, critical material, or hazardous material). Refer to appropriate manuals/directives for specific instructions. (a) NATIONAL STOCK NUMBER (Column (3)). Lists the National Stock Number (NSN) assigned to the item. Use the NSN for requests/requisitions). (b) FSCM (Column (4)). The Federal Supply Code for Manufacturer (FSCM) is a 5-digit numeric code which is used to identify the manufacturer, distributor, or Government agency, etc., that supplies the item.
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(c) PART NUMBER (Column (5)). Indicates the primary number used by the manufacturer (individual, company, firm, corporation, or Government activity), which controls the design and characteristics of the item by means of its engineering drawings, specifications standards, and inspection requirements to identify an item or range of items. NOTE When you use an NSN to requisition an item, the item you receive may have a different part number from the part ordered, but go ahead and use or furnish it as the replacement part. (d) DESCRIPTION (Column (6)). This column provides the following information: (1)The Federal Item Name and, when required, a minimum description to identify the item parts that make up an assembled item are listed immediately following the assembled item line entry and are indicated by an asterisk in front of the name. (2)NSNs for bulk materials are referenced in the description column in the line item entry for the item to be manufactured/fabricated. (3)When the part to be used differs between serial numbers of the same model, the effective serial numbers are shown as the last line of the description. (4)The USABLE ON CODE, when applicable (see paragraph C-4, SPECIAL INFORMATION). (5)In the Special Tool List Section, the basis of issue (BOI) appears as the last line(s) in the entry for each special tool, special TMDE, and other special equipment. When density of equipment supported exceeds density spread indicated in the basis of issue, the total authorization is increased proportionately. (e) U/M (Column (7)). The Unit of Measure (U/M) indicates the measure (e.g., foot, gallon, pound) or count (e.g., each, dozen, gross) of a listed item. A two-character alpha code (e.g., FT, GL, :B EA, DZ, GR) appears in this column to indicate the measure or count. If the U/M code appearing in this column differs from the Unit of Issue (U/I) code listed in the Army Master Data File (AMDF), request the lowest U/I that will satisfy your needs. (f)
B-4.
QTY INCIN UNIT (Column (8)). The Quantity Incorporated in Unit (QTY INCIN UNIT) indicates the quantity of the item used in the breakout shown on the illustration figure, which is prepared for a functional group, subfunctional group, or an assembly. A “V” appearing in this column in lieu of a quantity indicates that no specific quantity is applicable (e.g., shims, spacers).
SPECIAL INFORMATION a. The USABLE ON CODE title appears in the lower right corner of column (6), Description. Usable on codes are shown in the right-hand margin of the description column. Uncoded items are applicable to all models. Identification of the usable on codes used in this publication are: Code 000
Used ON Tool and Gage Set PN 8426685
B-5
PCN 184 114160 00
TM11416A-IN/1
b. Detailed assembly instructions for items source coded to be assembled from component spare/repair parts are found in Chapter 3. Items that make up the assembly are listed immediately following the assembled item entry or appropriate group header. B-5.
HOW TO LOCATE REPAIR PARTS a. When National Stock Number or Part Number is not Known: (1)
First. Using the table of contents, determine the functional group or subfunctional group to which the item belongs. This is necessary since figures are prepared for functional groups and subfunctional groups and listings are divided into the same groups.
B-6
PCN 184 114160 00
TM11416A-IN/1
SECTION I. REPAIR PARTS LIST
Figure B-1. Major Rifle Components.
Item Number 0
Part Number
1 2 3 4
PRI M84 N/A N/A 8448505
NSN 1005-LL-L99-8220 1005-05-0031 N/A N/A 1005-01-441-1619
Nomenclature Rifle, Special Purpose, 5.56mm, MK 12 Mod 1 USMC Assembly, Charging Handle Assembly, Upper Receiver/Barrel (Mod 1) Assembly, Lower Receiver/Buttstock Assembly, Key and Bolt Carrier
B-7
SM&R Code PDOOD PAOZZ PAHZZ PAHZZ AFFFF
PCN 184 114160 00
TM11416A-IN/1
Figure B-2. Bolt Carrier with Firing Pin.
Item Number 0 1 2 3 4 5 6
Part Number 8448505 8448503 8448508 8448504 8448506 8448502 8448507
NSN 1005-01-441-1619 1005-00-017-9547 5305-00-992-7284 1005-00-999-1509 1005-00-992-7283 5315-00-992-7294 1005-00-788-6213
B-8
Nomenclature Assembly, Key and Bolt Carrier Firing Pin Screw, Carrier Key Firing Pin Retaining Pin Bolt Carrier Key Pin, Hooded, Bolt Cam Bolt Carrier
SM&R Code AFFFF PAOZZ PAFZZ PAOZZ PAFZZ PAOZZ PAFZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-3. Bolt Assembly.
Item Number 0 1 2 3 4 5 6 7 8
Part Number 12972691 8448511 8448510 8448513 MS16562-98 8448516 8448515 8448512 12972692
NSN 1005-01-423-3770 1005-00-992-7287 1005-01-465-0080 1005-00-992-7290 5315-00-597-5086 5360-00-992-7292 1005-00-992-7291 1005-00-992-7288 1005-01-424-5899
B-9
Nomenclature Bolt Assembly Ring, Bolt Bolt Pin, Extractor Pin, Spring Ejector Spring, Ejector Ejector, Cartridge Extractor, Cartridge Assembly, Spring, Extractor Kit
SM&R Code PAOFF PAFZZ XAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-4. Upper Receiver Assembly.
Item
Part Number
NSN
Nomenclature
SM&R
Number
Code
0
N/A
N/A
1
12972670
1005-01-382-6795
2
N/A
N/A
Handguard Retaining Nut
3
N/A
N/A
Barrel Nut
4
MS16632-1012
5365-00-064-2652
Retaining Ring
PAOZZ
5
8448533
5315-00-978-1023
Pin, Ejection Port Cover
PAOZZ
6
8448525
1005-00-978-1022
Cover, Ejection Port
PAOZZ
7
8448532
5360-00-978-1025
Spring, Helical, Cover
PAOZZ
8
MS16562-121
5315-01-027-4759
Pin, Spring, Forward Assist
PAFZZ
9
8448540
5360-00-017-9541
Spring, Helical, Forward Assist
PAFZZ
10
9349086
1005-01-442-0160
Assembly, Forward Assist
PAFZZ
Assembly, Upper Receiver
B-10
Receiver, Upper
PAFZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-5. Forward Assist Assembly.
Item Number 1 2 3 4 5
Part Number 95113 8448543 8448544 8448542 9349085
NSN 5315-00-017-9552 1005-00-017-9539 1005-00-017-9540 5360-00-523-8084 1005-01-144-1468
B-11
Nomenclature Pin, Spring Pawl, Forward Assist Detent, Pawl Spring, Helical, Compression Plunger Assembly
SM&R Code PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-6. RAS Assembly.
Item Number 1 2 3
Part Number 95047 99167 95215
NSN N/A 1005-LL-L99-7669 N/A
B-12
Nomenclature Rail Covers Rifle RAS, Handguard (Mod 1) Handguard Pins
SM&R Code PAOZZ PAOZZ PAOZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-7. Barrel Assembly.
Item Number 1 2 3 4 5 6 7 8 9 10
Part Number M16A1SPR 8448567 N/A 1250 1050 1012 7845 9349051 96051 12991533
NSN 1005-LL-L99-7671 4710-00-978-1038 N/A 1005-LL-L99-7675 1005-LL-L99-7676 1005-LL-L99-7674 1005-LL-L99-7673 5315-00-058-6044 5365-01-468-1378 5301-01-475-9652
B-13
Nomenclature Barrel Gas Tube Assembly Set Screw Thread Protector Muzzle Break Suppressor Collar Gas Tube Assembly Gas Tube Pin 7 pc. Shim Kit Crush Washer
SM&R Code PAFZZ PAFZZ PAOZZ PAFZZ PAFZZ PAOZZ PAOZZ PAFZZ PAFZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-8. Lower Receiver.
B-14
PCN 184 114160 00
TM11416A-IN/1
Item Number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Part Number N/A 8448582 8448583 MS16562-119 DPMS-M1601 8448628 8448634 8448633 8448638 8448586 8448585 N/A 8448585 8448637 8448636 8448631 8448516 8448587 MS16562-129 9349127 MS35335-61 5305-01-147-0777 8448609
NSN N/A 5315-00-992-6651 5360-00-992-6652 5315-00-812-3312 N/A 1005-00-017-9548 1005-00-056-2247 5360-00-056-2246 1005-00-056-2201 5360-00-992-6655 5315-00-992-6654 N/A 5315-00-992-6658 5360-00-992-7301 1005-00-992-7302 1005-00-992-6667 5360-00-992-7292 1005-00-992-7299 5315-00-058-6081 1005-01-148-4805 5310-00-527-3634 5305-01-268-1191 5315-00-992-7309
23 24 25 26 27 28 29 30 31 32
22362 94025 8448593 98164 94816 8448595 94031 8448586 8448585 8448584
N/A N/A 5360-00-992-7308 1005-LL-L99-7677 N/A 1005-00-992-6649 N/A 5360-00-992-6655 5315-00-992-6654 5315-00-992-6653
B-15
Nomenclature Assembly, Lower Receiver Buffer Retainer Spring, Buffer Retainer Pin, Spring, Bolt Catch Selector, Ambidextrous Bolt Catch Bolt Catch Plunger Bolt Catch Spring Magazine Catch Spring, Takedown/Pivot Pin Takedown/Pivot Pin Detent Receiver, Lower Pivot Pin Magazine Catch Spring Magazine Catch Button Safety Detent Safety Detent Spring Trigger Guard Pin, Spring, Trigger Guard Pistol Grip Washer, Lock, Grip Screw, Machine, Grip Pin, Grooved, Hammer and Trigger Hammer Spring Hammer Trigger Spring Trigger, Match (Mod 1) Disconnector Spring Sear Disconnector Takedown Pin Spring Takedown Pin Detent Takedown Pin
SM&R Code XAFFA PAFZZ PAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PHOZZ PHOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-8. Buttstock Assembly.
Item Number 1 2 3 4 5 6
Part Number 9349128 9349119 8448615 8448629 8448581 9349129
NSN 5305-01-147-8585 1005-01-135-4973 1005-00-937-3078 5360-00-992-6665 5340-00-992-7297 5315-01-267-2169
B-16
Nomenclature Buttcap Screw (Short screw) Buttstock Assembly Buffer Assembly Action Spring Buffer Tube Space, Stepped
SM&R Code PAOZZ PAOZZ PAOZZ PAOZZ PAFZZ PAOZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-9. Accessories.
B-17
PCN 184 114160 00
TM11416A-IN/1
Item Number 1 1a 2 3 4 5 6 7 7a 8 9 10 11 12 13
Part Number 22 22L 60150 7614375 99051 98474 N/A 6012 98060 0112 22CF-30 1700 5960576 55677
NSN 1005-LL-L99-7679 N/A N/A 1005-01-504-3277 1005-LL-L99-7681 1005-LL-L99-7682 1005-00-056-2237 N/A 1005-LL-L99-7683 1005-LL-L99-7684 1005-LL-L99-7685 1005-LL-L99-6012 1005-LL-L99-7686 1005-LL-L99-7687 8465-01-524-8847
B-18
Nomenclature Scope Ring Set (medium) Scope Ring Set (high) Leupold Mark 4 2.5-8X36mm Suppressor Flip-up Front Sight (Mod 1) Rear Flip-up Sight 30 Round Magazine Bipod Bipod Rail Adapter Custom Bore Guide Cleaning Rod Storage Case Range Computer (Mildot Master) Ballistic Card Sling
SM&R Code PAOZZ PAOZZ PAOZA PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ
PCN 184 114160 00
TM11416A-IN/1
Figure B-10. Special Tools and Gages.
B-19
PCN 184 114160 00
TM11416A-IN/1
Item Number 1 2 3 4
Part Number 12006359 8448201 12620101 8448496
NSN 4933-01-035-5607 4933-00-800-7508 5220-01-075-5004 5220-01-014-8183
5 6 7 8 9 10 11
8448202 7799734 7799735 11010032 12997571 12926769 9390035
5220-00-221-9391 5220-00-070-7814 5220-00-070-7815 4933-00-070-9151 5120-01-505-1677 5315-01-310-0370 5120-01-324-6631
B-20
Nomenclature Case, Bore Gage Reflector Tool, Chamber Gage, Plug, Plain Gage, Barrel, Erosion Barrel Erosion (Chrome Barrel) Gage, Straightness Gage, Headspace Gage, Firing Pin Protrusion Fixture, Barrel Removal Wrench, Combination Key, Machine Key Wrench, Spanner A/R for M4/ M4A1 Carbine UOC: ASI, AY6
SM&R Code PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ
PCN 184 114160 00
TM11416A-IN/1
SECTION III. CROSS REFERENCE INDEXES, PART NUMBER PART NUMBER
NATIONAL STOCK NUMBER
22 22CF-30 22L 0112 1012 1050 1250 1700 6012 7845 55677 60150 95047 95113 95215 96051 98060 98164 98474 99051 99167 5960576 7614375 7799734 7799735 8448201 8448202 8448496 8448502 8448503 8448504 8448505 8448505 8448506 8448507 8448508 8448510 8448511 8448512 8448513 8448515
1005-LL-L99-7679 1005-LL-L99-7685 N/A 1005-LL-L99-7684 1005-LL-L99-7674 1005-LL-L99-7676 1005-LL-L99-7675 1005-LL-L99-6012 N/A 1005-LL-L99-7673 1005-LL-L99-7687 N/A N/A 5315-00-017-9552 N/A 5365-01-468-1378 1005-LL-L99-7683 1005-LL-L99-7677 1005-LL-L99-7682 1005-LL-L99-7681 1005-LL-L99-7669 1005-LL-L99-7686 1005-01-504-3277 5220-00-070-7814 5220-00-070-7815 4933-00-800-7508 5220-00-221-9391 5220-01-014-8183 5315-00-992-7294 1005-00-017-9547 1005-00-999-1509 1005-01-441-1619 1005-01-441-1619 1005-00-992-7283 1005-00-788-6213 5305-00-992-7284 1005-01-465-0080 1005-00-992-7287 1005-00-992-7288 1005-00-992-7290 1005-00-992-7291 B-21
CAGE CODE PAOZZ PAOZZ PAOZZ PAOZZ PAFZZ PAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZA PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAOZZ PAOZZ PAOZZ AFFFF AFFFF PAFZZ PAFZZ PAFZZ XAFZZ PAFZZ PAOZZ PAOZZ PAOZZ
FIGURE NUMBER B-10 B-10 B-10 B-10 B-7 B-7 B-7 B-10 B-10 B-7 B-10 B-10 B-6 B-5 B-6 B-7 B-10 B-8 B-10 B-10 B-6 B-10 B-10 B-11 B-11 B-11 B-11 B-11 B-2 B-2 B-2 B-1 B-2 B-2 B-2 B-2 B-3 B-3 B-3 B-3 B-3
ITEM NUMBER 1 9 1a 8 6 5 4 10 7 7 12 2 1 1 3 9 7a 26a 5 4 2 11 3 6 7 2 5 4 5 1 3 4 0 4 6 2 2 1 7 3 6
PCN 184 114160 00
TM11416A-IN/1
SECTION III. CROSS REFERENCE INDEXES, PART NUMBER PART NUMBER
NATIONAL STOCK NUMBER
FIGURE NUMBER B-3 B-8 B-7
ITEM NUMBER 5 16
1005-00-978-1022
CAGE CODE PAOZZ PAOZZ PAOZZ
8448516 8448516
5360-00-992-7292 5360-00-992-7292
8448525
5360-00-978-1025
PAOZZ
B-4
7
5315-00-978-1023
PAOZZ
B-4
5
8448540 8448542 8448543 8448544 8448567 8448581 8448582 8448583 8448584 8448585 8448585 8448586 8448586 8448587 8448592 8448593 8448595 8448609 8448611 8448612 8448615 8448621 8448628 8448629 8448631 8448633 8448634 8448635 8448636 8448637 8448638 9349051 9349085
5360-00-017-9541 5360-00-523-8084 1005-00-017-9539 1005-00-017-9450 4710-00-978-1038 5340-00-992-7297 5315-00-992-6651 5360-00-992-6652 5315-00-992-6653 5315-00-992-6654 5315-00-992-6654 5360-00-992-6655 5360-00-992-6655 1005-00-992-7299 1005-00-992-7307 5360-00-992-7308 1005-00-992-6649 5315-00-992-7309 5360-00-992-6648 1005-00-017-9551 1005-00-937-3078 5315-00-017-9537 1005-00-017-9548 5360-00-992-6665 1005-00-992-6667 5360-00-056-2246 1005-00-056-2247 1005-00-999-0406 1005-00-992-7302 5360-00-992-7301 1005-00-056-2201 5315-00-058-6044 1005-01-144-1468
PAFZZ
B-4
1005-01-442-0160 1005-01-135-4973 1005-01-148-4805 5305-01-147-8585
B-5 B-5 B-5 B-7 B-9 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-9 B-8 B-8 B-9 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-7 B-5 B-4
9 4 2 3 2 5 1 2 32 10 31 9 30 17 26 25 28 22 23 24 3 12 5 4 15 7 6 29 14 13 8 8 5
9349086 9349119 9349127 9349128
PAOZZ PAOZZ PAOZZ PAFZZ PAFZZ PAFZZ PAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAFZZ PAOZZ PAOZZ PAOZZ
B-9 B-8 B-9
8448532 8448533
B-22
6
10 2 19 1
PCN 184 114160 00
TM11416A-IN/1
SECTION III. CROSS REFERENCE INDEXES, PART NUMBER PART NUMBER
NATIONAL STOCK NUMBER
9349129 9390035 11010032 12006359 12620101 12926769
5365-01-267-2169 5120-01-324-6631 4933-00-070-9151 4933-01-035-5607 5220-01-075-5004 5315-01-310-0370
12972670 12972691 12972692 12972695 12991533 12997571 AN501D416-18 DPMS-M1601 M16A1SPR MS16562-98 MS16562-119
1005-01-382-6795 1005-01-423-3770 1005-01-424-5899 5360-01-396-0256 5301-01-475-9652 5120-01-505-1677 5305-01-268-1191 N/A 1005-LL-L99-671 5315-00-597-5086 5315-00-812-3312
MS16562-121 MS16562-129 MS16636-1012 MS35335-61 PRI M84 N/A N/A N/A N/A N/A
5315-01-027-4759 5315-00-058-6081 5365-00-64-2653 5310-00-527-3634 1005-05-0031 1005-00-056-2237 1005-LL-L99-8220 N/A N/A N/A
N/A
N/A
B-4
2
N/A
N/A
B-4
N/A N/A N/A
N/A N/A N/A
3 3 0 11
B-23
CAGE CODE PAOZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ
FIGURE NUMBER B-9 B-11 B-11 B-11 B-11 B-11 B-4
PAOFF PAOZZ PAOZZ PAFZZ PAFZZ PAOZZ
B-3 B-3 B-8 B-7 B-11 B-8 B-8 B-7 B-3 B-8 B-4
PAFZZ PAOZZ PAOZZ PAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PDOOD PAHZZ PAHZZ
ZAFFA
B-8 B-4 B-8 B-1 B-10 B-1 B-1 B-1 B-4
B-7 B-8 B-8
ITEM NUMBER 6 11 8 1 3 10 1 0 8 27 10 9 21 4 1 4 3 8 18 4 20 1 6 0 2 3 0
PCN 184 114160 00
TM11416A-IN/1
SECTION II. CROSS REFERENCE INDEXES, FIGURE AND ITEM NUMBER FIGURE NUMBER B-1 B-1 B-1 B-1 B-1 B-2 B-2 B-2 B-2 B-2 B-2 B-2 B-3 B-3 B-3 B-3 B-3 B-3 B-3 B-3 B-3
ITEM NUMBER 0 1 2 3 4 0 1 2 3 4 5 6 0 1 2 3 4 5 6 7 8
B-4
0
B-4
1
B-4
2
1005-01-382-6795 N/A
B-4
3
N/A
B-4
4
5365-00-064-2652
PAOZZ
MS16632-1012
B-4
5
5315-00-978-1023
PAOZZ
8448533
B-4
6
1005-00-978-1022
PAOZZ
8448525
B-4
7
5360-00-978-1025
PAOZZ
8448532
B-4
8
5315-01-027-4759
PAFZZ
MS16562-121
NATIONAL STOCK NUMBER 1005-LL-L99-8220 1005-05-0031 N/A N/A 1005-01-441-1619 1005-01-441-1619 1005-00-017-9547 5305-00-992-7284 1005-00-999-1509 1005-00-992-7283 5315-00-992-7294 1005-00-788-6213 1005-00-992-7285 1005-00-992-7287 1005-01-465-0080 1005-00-992-7290 5315-00-597-5086 5360-00-992-7292 1005-00-992-7291 1005-00-992-7288 1005-01-424-5899 N/A
CAGE CODE PDOOD PAOZZ PAHZZ PAHZZ AFFFF AFFFF PAOZZ PAFZZ PAOZZ PAFZZ PAOZZ PAFZZ PAOFF PAFZZ XAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ
PART NUMBER
PAFZZ
12972670 N/A
N/A PRI M84 N/A N/A 8448505 8448505 8448503 8448508 8448504 8448506 8448502 8448507 12972691 8448511 8448510 8448513 MS16562-98 8448516 8448515 8448512 12972692 N/A
N/A
B-4
9
5360-00-017-9541
PAFZZ
8448540
B-4 B-5 B-5 B-5 B-5 B-5 B-6 B-6 B-6 B-7
10 1 2 3 4 5 1 2 3 1
1005-01-442-0160 5315-00-017-9552 1005-00-017-9539 1005-00-017-9540 5360-00-523-8084 1005-01-144-1468 N/A 1005-LL-L99-7669 N/A 1005-LL-L99-7671
PAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAFZZ
9349086 95113 8448543 8448544 8448542 9349085 95047 99167 95215 M16A1SPR
B-24
PCN 184 114160 00
TM11416A-IN/1
SECTION II. CROSS REFERENCE INDEXES, FIGURE AND ITEM NUMBER (CONT.) FIGURE NUMBER B-7 B-7 B-7 B-7 B-7 B-7 B-7 B-7 B-7 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8 B-8
ITEM NUMBER 2 3 4 5 6 7 8 9 10 0 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 26a 27 28 29 30 31
NATIONAL STOCK NUMBER 4710-00-978-1038 N/A 1005-LL-L99-7675 1005-LL-L99-7676 1005-LL-L99-7674 1005-LL-L99-7673 5315-00-058-6044 5365-01-468-1378 5301-01-475-9652 N/A 5315-00-992-6651 5360-00-992-6652 5315-00-812-3312 N/A 1005-00-017-9548 1005-00-056-2247 5360-00-056-2246 1005-00-056-2201 5360-00-992-6655 5315-00-992-6654 N/A 5315-00-017-9537 5360-00-992-7301 1005-00-992-7302 1005-00-992-6667 5360-00-992-7292 1005-00-992-7299 5315-00-058-6081 1005-01-148-4805 5310-00-527-3634 5305-01-268-1191 5315-00-992-7309 5360-00-992-6648 1005-00-017-9551 5360-00-992-7308 1005-00-992-7307 1005-LL-L99-7677 5360-01-396-0256 1005-00-992-6649 1005-00-999-0406 5360-00-992-6655 5315-00-992-6654 B-25
CAGE CODE PAFZZ PAOZZ PAFZZ PAFZZ PAOZZ PAOZZ PAFZZ PAFZZ XAFFA PAFZZ PAFZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PHOZZ PHOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ
PART NUMBER 8448567 N/A 1250 1050 1012 7845 9349051 96051 12991533 N/A 8448582 8448583 MS16562-119 DPMS-M1601 8448628 8448634 8448633 8448638 8448586 8448585 N/A 8448621 8448637 8448636 8448631 8448516 8448587 MS16562-129 9349127 MS35335-61 5305-01-147-0777 8448609 8448611 8448612 8448593 8448592 98164 12972695 8448595 8448635 8448586 8448585 PCN 184 114160 00
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SECTION II. CROSS REFERENCE INDEXES, FIGURE AND ITEM NUMBER (CONT.) FIGURE NUMBER B-8 B-9 B-9 B-9 B-9 B-9 B-9 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-10 B-11 B-11 B-11 B-11 B-11 B-11 B-11 B-11 B-11 B-11 B-11
ITEM NUMBER 32 1 2 3 4 5 6 1 1a 2 3 4 5 7a 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11
NATIONAL STOCK NUMBER 5315-00-992-6653 5305-01-147-8585 1005-01-135-4973 1005-00-937-3078 5360-00-992-6665 5340-00-992-7297 5365-01-267-2169 1005-LL-L99-7679 N/A N/A 1005-01-504-3277 1005-LL-L99-7681 1005-LL-L99-7682 1005-LL-L99-7683 1005-00-056-2237 N/A 1005-LL-L99-7684 1005-LL-L99-7685 1005-LL-L99-6012 1005-LL-L99-7686 1005-LL-L99-7687 4933-01-035-5607 4933-00-800-7508 5220-01-075-5004 5220-01-014-8183 5220-00-221-9391 5220-00-070-7814 5220-00-070-7815 4933-00-070-9151 5120-01-505-1677 5315-01-310-0370 5120-01-324-6631
B-26
CAGE CODE PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAFZZ PAOZZ PAOZZ PAOZZ PAOZA PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAOZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ PAFZZ
PART NUMBER 8448584 9349128 9349119 8448615 8448629 8448581 9349129 22 22L 60150 7614375 99051 98474 98060 N/A 6012 0112 22CF-30 1700 5960576 55677 12006359 8448201 12620101 8448496 8448202 7799734 7799735 11010032 12997571 12926769 9390035
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APPENDIX C SPECIAL TOOLS LIST SECTION I. INTRODUCTION C-1.
SCOPE.
This Repair Parts and Special Tools List (RPSTL) lists and authorizes special tools and other special support equipment required for performance of unit and direct support maintenance of MK 12 MOD 0. It authorizes requisitioning, issue, and disposition of spares, repair parts, and special tools as indicated by Source, Maintenance, and Recoverability (SM&R) codes.
SECTION II. SPECIAL TOOLS LIST Nomenclature Strap Wrench 1/2” to 3/8” Adapter Strap Wrench Upper Receiver Action Block Lower Receiver Vice Block Torque Wrench Adapter for Scope 7/64 x 1/4 drive Microtork Torque Wrench (10-75 ft/lbs) Microtork Torque Wrench (25-250 in/lbs)
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NSN or PN TG70 (Glenair, Inc) 1FK43 (GSA/ Granger) 702-003-015 (GSA/ Brownells) 702-004-015 (GSA/ Brownells) 8496617 (GSA/ MSC) 9-44594 (Craftsman GSA Catalog) 9-44593 (Craftsman GSA Catalog)
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APPENDIX D EXPENDABLE SUPPLIES AND MATERIALS LIST SECTION I. INTRODUCTION D-1.
SCOPE.
This appendix lists expendable supplies and materials you will need to operate and maintain the MK 12 MOD 1 SPR. This listing is for informational purposes only and is not authority to requisition the listed items. These items are authorized to you by CTA 50-970. Expendable Items (Except Medical, Class V, Repair Parts, and Heraldic Items), or CTA 8-100, Army Medical Department Expendable/Durable Items. D-2.
EXPLANATION OF COLUMNS. a.
Column (1) - Item Number. This number is assigned to the entry in the listing and is referenced in the narrative instructions to identify the material (e.g., “Use cloth, abrasive, crocus, item 12, app D”).
b.
Column (2) - Level. This column identifies the lowest level of maintenance that requires the listed item. C - Operator/Crew Maintenance O - Unit Maintenance F - Direct Support Maintenance
c.
Column (3) - National Stock Number. This is the National Stock Number assigned to the item; use it to request or requisition the item.
d.
Column (4) - Description. Indicates the Federal item name and, if required, a description to identify the item. The last line for each item indicates the Commercial and Government Entity Code (CAGEC) in parentheses followed by the part number.
e.
Column (5) - Unit of Measure (U/M). Indicates the measure used in performing the actual maintenance function. This measure is expressed by a two-character alphabetical abbreviation (e.g., ea, in., pr). If the unit of measure differs from the unit of issue, requisition the lowest unit of issue that will satisfy your requirements. SECTION II. EXPENDABLE SUPPLIES AND MATERIALS LIST
(1)
(2)
Item Number
Level
(3) National Stock Number
1
F
8040-00-944-7292
2
O
8020-00-244-0153
3
F
1005-00-716-2702
4
C
1005-00-903-1296 D-1
(4)
(5)
Description
U/M
ADHESIVE, KIT: (81348) MMMA-1754 BRUSH, ARTIST’S: metal ferrule, flat chisel edge 7/16 w, 1 1/8, exposed bristle (81348) HB-241 BRUSH, CLEANING, SMALL ARMS: (19205) 7162702 BRUSH, CLEANING, SMALL ARMS: bore (19204) 11686340
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(1)
(2)
Item Number
Level
(3) National Stock Number
5
C
1005-00-999-1435
6
C
1005-00-444-6602
7
O
7920-00-205-2401
8
O
6850-00-965-2332
10
O O O C
9150-01-079-6124 9150-01-054-6453 9150-01-053-6688 9150-01-102-1473
11
C
9920-00-292-9946
13
C O O O
6850-00-224-6656 6850-00-224-6657 6850-00-224-6663 5350-00-221-0872
15
F
9
12
16
O
6810-00-244-0290 6810-00-616-9188 6850-00-281-1985
17
O
8010-00-297-0560
D-2
(4)
(5)
Description
U/M
BRUSH, CLEANING, SMALL ARMS: chamber (19204) 8432358 BRUSH, CLEANING, SMALL ARMS: tooth (19204) 8448462 BRUSH, CLEANING, TOOLS AND PARTS: (81349) MILS43871 CARBON REMOVING COMPOUND: (81348) P-C-111 CLEANER, LUBRICANT AND PRESERVATIVE: (27412) MILL-63460 CLP - 4 oz (118.30 ml) bottle CLP - 1 pt (0.47 l) bottle CLP - 1 gal. (3.781) can CLEANER, LUBRICANT AND PRESERAVATIVE: (81349) MILL-63460 1/2 oz (14.79 ml) bottle CLEANER, TOBACCO PIPE: cotton turf, wire core (89855) DILLSPIPE cleaner (36 per pkg) CLEANING COMPOUND, RIFLE BORE: small arms bore cleaning solution (RBC) (81349) MIL-PRF-372 2 oz (59.15 ml) bottle 8 oz (236.59 ml) can 1 gal. (3.79 l) can CLOTH, ABRASIVE: (58536) AA-1206 DICHLOROMETHANE, TECHNICAL: (81346) ASTM D 4701 5 gal. (18.93 l) pail 600 lb (272.16 kg) drum DRY CLEANING SOLVENT: (58536) A-A-711 1 gal. (3.79 l) can ENAMEL: olive drab no. 3407 (81348) TT-E-527 1 gal. (3.79 l) can
EA
EA EA
GL
EA EA EA EA
EA
OZ CN CN SH
CN DR GL
GL
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(1)
(2)
Item Number
Level
18
O
(3) National Stock Number
19
F
8415-00-823-7458 8415-00-823-7459 8415-00-823-7460 9150-00-754-2595
20
C
1005-01-113-0321
21
O
9150-01-260-2543
22
C
9150-00-292-9689
23.1
C C O O O
9150-00-935-6597 9150-00-889-3522 9150-00-687-4241 9150-00-753-4686 5340-01-230-3181
23.2
O
8010-00-087-0102
23.3
O
8010-01-031-1274
24
O
3990-00-795-3595
25
F
6850-00-826-0981
26
F
8135-01-019-1691
26.1
O
1005-01-394-7677
27
C
7920-00-205-1711
23
D-3
(4)
(5)
Description
U/M
GLOVES, CHEMICAL AND OIL PROTECTIVE: (81348) MILDTL-32066 Size 9 Size 10 Size 11 GREASE, MOLYBDENUM DISULFIDE: (81349) MIL-G21164 HANDLE SECTION, CLEANING ROD, SMALL ARMS: (19204) 8436776 LUBRICANT, SOLID FILM: (81349) MIL-L-23398 16 oz (473.18 ml) spray can LUBRICATING OIL, WEAPONS: (LAW) (81349) MIL-L-14107 1 qt (0.95 l) can LUBRICATING OIL, WEAPONS: (LSA), semifluid (81349) MIL-L46000 2 oz (59.15 ml ) plastic btl 4 oz (118.30 ml) plastic btl 1 qt (0.95 l) can 1 gal. (3.79 l) can MOUNTING BRACKET (M4/ M4A1 only) (192000) 12556036 PAINT, ENAMEL, SEMIGLOSS: paint for blank firing attachment (M15A2) (81348) TT-E-529 1 qt can (RED - Rifle) PAINT, ENAMEL, SEMIGLOSS: paint for blank firing attachment (M23) (81348) TT-E-529 1 pt can (YELLOW - Carbine) PAN, WASH (BOX, TOTE): (94453) 1211 PENETRANT KIT: (81349) MIL-I-25135 POLYETHYLENE SHEET: (84744) PE88-80-2 PROTECTOR, RAIL (M16A4, M4/M4A1 only) (19200) 12972676 RAG, WIPING: (58536) A-A-531 50 lb (22.68 kg) bdl
PR PR PR LB
EA
OZ
QT
OZ OZ CN CN EA EA
EA
EA KT EA EA
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(1)
(2)
Item Number
Level
(3) National Stock Number
28
C
1005-00-050-6357
29
F
8030-00-670-8553
31
O O O C
6850-01-474-2319 6850-01-474-2317 6850-01-474-2316 1005-00-937-2250
32
C
1005-00-912-4248
33
C
6920-01-482-0098
30
34 35 36 37
6810-00-223-2739 6515-00-303-8250 7920-00-205-0565
38
6640-00-663-0832
D-4
(4)
(5)
Description
U/M
ROD SECTION, CLEANING SMALL ARMS: (19204) 8436775 (3 REQUIRED) SEALING, COMPOUND (16059) DEVCONF SOLVENT, GENERAL MIL-PRF680, Type II 1 gal. 5 gal. 55 gal. drum SWAB HOLDER SECTION, CLEANING ROD, SMALL ARMS: (19204) 11686327 SWAB, SMALL ARMS: (19204) 11686408 TARGET, 25 METER ZEROING, M16A2/A3/A4 & M4A1: (19200) 12988975 LOCTITE 242 & 262 ACETONE, TECHNICAL APPLICATOR, DISPOSABLE BRUSH, DUSTING, LENS, & PHOTOGRAPHIC NEGATIVE PAPER, LENS
EA
KT
GL GL GL EA
SH BX
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APPENDIX E TORQUE LIMITS E-1.
INTRODUCTION.
This appendix lists the torque limits for the compensator, barrel nut, carrier key screws, and lower receiver extension. ITEM Barrel Nut Carrier Key Screws Lower Receiver Extension Scope Rings Handguard
TORQUE TO 31 ft lbs min. Do not exceed 80 ft lbs to align slot 35 in lbs to 40 in lbs 35 in lbs to 39 in lbs 15 in lbs 25 ft lbs to 28 ft lbs
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APPENDIX F LIST OF LOCALLY MANUFACTURED TOOLS
Tool Pivot Pin Removal Tool (Fabricated) Pivot Pin Installation Tool (Fabricated) Carrier Key Tool Pivot Pin Installation Tool Fabricated Trigger Pilot Pin.
Figure Number Figure F-1 Figure F-2 Figure F-3 Figure F-4 Figure F-5
SECTION I. SPECIAL TOOLING FABRICATIONS (ON-SITE) Tools and Special Tools Hack Saw, Drimel or Equivalent Rotary Tool, Table Vice
Personnel Required 2111
Materials/Parts 1/16" Allen Wrench Rotary Cutting Wheel WARNING Rotary tools can cause flying debris and capture loose clothing. Wear Safety Glasses and keep loose clothing away from tool. F-1.
PIVOT PIN REMOVAL TOOL. a.
Measuring from inside edge of short arm, mark 1/16" Allen Wrench ¼" from end (1).
b.
Secure 1/16" Allen Wrench in vice. Using your rotary cutter or hacksaw, cut from outside edge end to 1/4" mark at angle (2).
c.
File or sand any sharp edges.
Figure F-1. Pivot Pin Removal Tool.
F-1
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F-2.
PIVOT PIN INSTALLATION TOOL. WARNING Rotary tools can cause flying debris and capture loose clothing. Wear Safety Glasses, and keep loose clothing away from tool. a.
Using hacksaw or rotary tool, cut screwdriver at 45 degree angle approximately 2 1/2" from handle. Sand or file sharp edges (1).
Figure F-2. Pivot Pin Installation Tool.
F-3.
CARRIER KEY TOOL. NOTE All dimensions are in inches.
a.
Fabricate from 0.375 inch round metal bar, QQ-T-580, FSCM 81348, Grade C, Class W2-09 NSN 951000-640-4407 or equivalent. Figure F-3. Carrier Key Tool.
F-2
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F-4.
PIVOT PIN INSTALLATION TOOL. NOTE All dimensions are in inches.
a.
Fabricate from 0.245 inch steel A1S1 1095 or equivalent. Harden and temper to RC-57-61 for length -A-. Finish 5.3.1.2. or 5.3.2.2 of MIL-STD-171 Figure F-4. Pivot Pin Installation Tool.
F-5.
FABRICATED TRIGGER PILOT PIN. NOTE All dimensions are in inches.
a.
Fabricate from PN 8448609. Figure F-5. Fabricated Trigger Pilot Pin.
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APPENDIX G RECOMMENDED CHANGES TO PUBLICATIONS/LOGISTICS MAINTENANCE DATA CODING NAVMC (10772) The following is an example. There is a form on the CD that can be completed. Submit notice of discrepancies or suggested changes on a NAVMC 10772. The NAVMC may be submitted via the internet using website https://pubs.ala.usmc.mil/navmc/, the NAVMC Tracking Program and following instructions provided. It may also be submitted via e-mail to:
[email protected], or by mailing paper copy NAVMC 10772 in an envelope addressed to: Commander, Marine Corps Systems Command Attn: Assistant Commander Acquisition and Logistics (LOG/TP), 814 Radford Blvd., Suite 20343 Albany, Georgia, 31704-0343.
G-1
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