Receiver Assembly Maintenance Instructions Cont

DISASSEMBLY (CONT)

DISASSEMBLY (CONT)

Action Trigger M79

WARNING

To avoid injury to your eyes, use care when removing and installing spring-loaded parts.

NOTE

The new trigger pin, part number 12002921, for the receiver assembly is illustrated above. When the new trigger pin is removed, the trigger separates into three parts: the trigger, sear, and compression helical spring.. The old trigger pin is also illustrated above and is a repair part for the old trigger assembly. When the old trigger pin is removed, the trigger assembly remains intact by the sleeve bushing.

5. Remove spring pin (12), trigger pin (13), and trigger (14). If old trigger pin, remove sleeve bushing (15) from trigger(14). Remove sear (16) and compression helical spring (17) from trigger (14). Remove compression helical spring (18) from receiver assembly.

ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010

WARNING

Using the old style firing pin, part number 8448327, can cause injury to personnel and equipment when firing a live round. The old firing pin must be replaced by the new firing pin, part number 12002970, whenever the old pin is identified in the weapon.

6. Remove spring pin (19), cocking lever (20), and firing pin (21).

M203 Firing Pin Sear
22

25.1

25.1

WARNING

To avoid injury to your eyes, use care when removing and installing spring-loaded parts.

NOTE

Remove spring pin (25.1) only when damaged.

7. Remove spring pin (22) to release ejector retainer (23), compression helical spring (24) cartridge ejector (25), and spring pin (25.1).

M203 Exploded View

8. Remove spring pin (26) to release cartridge extractor (27). Remove compression helical spring (28).

ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010

3-10. RECEIVER ASSEMBLY - MAINTENANCE INSTRUCTIONS (CONT).

DISASSEMBLY (CONT)

DISASSEMBLY (CONT)

M203 Helical Spring
CLEANING

WARNING

Dry cleaning solvent is FLAMMABLE and TOXIC and must be kept away from open flames and used in a well-ventilated area. Use of rubber gloves is necessary to protect the skin when washing grenade launcher parts.

Appropriate eye protection is recommended when cleaning your weapon and/or its parts.

Clean parts of all grease, oil, water, and dirt using dry cleaning solvent (item 9, app D). After cleaning, dry all parts with a wiping rag (item 17, app D) and lubricate with CLP (item 5, app D).

INSPECTION/REPAIR

1. Check all parts for damage. Replace all authorized unserviceable parts.

2. Check all springs for breaks, distortion, and cracks. Replace if faulty.

3. Inspect all remaining parts for burrs or deformation. Remove burrs and minor deformations with a fine stone.

4. Check that firing pin, safety, extractor, and extractor pin are not broken. Replace if broken.

ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010

5. Inspect the trigger and sear for damage and/or wear. If excessively worn, the trigger pull can be affected. See page 3-34 for trigger pull test. If old trigger assembly is unserviceable, replace it with trigger, sear, and compression helical spring. The new trigger pin and spring pin will also be required.

6. Inspect barrel latch. Use penetrant kit (item 15, app D) to check for cracks as follows.

WARNING

Dry cleaning solvent is FLAMMABLE and TOXIC and must be kept away from open flames and used in a well-ventilated area. Use of rubber gloves is necessary to protect the skin when washing grenade launcher parts.

Appropriate eye protection is recommended when cleaning your weapon and/or its parts.

a. Make sure area to be inspected is clean and free of oil, etc., by using dry cleaning solvent (item 9, app D). Spray a small amount of remover on the area to be inspected, let it dry, and wipe off with a wiping rag (item 17, app D).

b. Spray penetrant to wet component to be inspected.

c. Spray developer over penetrant and let it work. Wherever there is a crack, there will be a change in color. If there are cracks, the component is unserviceable.

d. If no cracks are indicated, spray remover on area, let it dry, and wipe it off with a wiping rag (item 17, app D).

CAUTION

Do not remove breech insert unless damaged or

loose.

NOTE

For M203 receiver assemblies with serial numbers 39700 and

above, go to step 7.

For M203 receiver assemblies with serial numbers 39700 and

below, refer to step 8.

ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010

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    How to assemble m203 receiver?
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