Initial Setup

Tools and Special Tools

Barrel extension staking support tool (fig. E-3, app E) Bore constriction check tool (fig. E-1, app E) (ARMY) Small Arms Repairman Tool Kit (item 3, app B) (MC) Small Arms Repairman Tool Kit (item 3, app B)

Materials/Parts Adhesive (item 1, app D) Bore brush (7790631)

Cleaner, lubricant, and preservative (CLP) (item 5, app D)

Dry cleaning solvent (item 9, app D)

Penetrant kit (item 15, app D)

Rubber gloves (item 10, app D)

Wiping rag (item 17, app D)

Reference TM 9-1010-221-10

Equipment Condition

Barrel assembly removed from grenade launcher (page 2-17).

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

3-9. BARREL ASSEMBLY - MAINTENANCE INSTRUCTIONS

DISASSEMBLY

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

NOTE

• Disassemble only to replace unserviceable components.

• Cartridge locator and/or compression helical spring may have to be replaced if there is no spring tension when the cartridge locator is de-pressed.

• A file may have to be used to remove staked metal. Prying of the barrel extension may be required.

M203 Helical Spring

1. Check to see if barrel extension has previously been restaked. If it has been restaked previously, a new barrel extension is necessary.

2. Disassemble staked barrel extension (1), cartridge locator (2), and compression helical spring (3) from barrel (4).

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.

1. Clean components thoroughly of all grease, oil, water and any excessive adhesive using dry cleaning solvent (item 9, app D). After cleaning, dry all parts with a wiping rag (item 17, app D).

2. Clean bore and chamber with bore brush (see TM 9-1010-221-10).

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

INSPECTION/REPAIR

1. Inspect the bore of the barrel (1) for pitting and erosion. Fine pits are allowed. If pits are wider than the lands or grooves and are over 0.38 inch (0.97 cm) in length, replace barrel.

2. Use bore constriction check tool (2) (fig. E-1, app E) to detect dents and minor damage that would interfere with forward progress of fired projectile. Tool must pass freely through entire barrel bore. If it does not pass freely, the barrel is unserviceable and must be replaced.

3. Inspect compression helical spring (3) for breaks and distortion. Replace if necessary.

4. Visually inspect cartridge locator (4) for burrs, pits, and cracks. Replace if necessary.

M203 Helical Spring

5. Inspect barrel extension (5) for burrs, pits, and cracks using penetrant kit (item 15, app D) 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, free of oil, etc. by using dry cleaning solvent (item 9, app D). Spray a small amount of remover in penetrant kit on the area to be inspected, let it dry, and wipe with a wiping rag (item 17, app D).

ARMY TM 9-101 0-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010

3-9. BARREL ASSEMBLY—MAINTENANCE INSTRUCTIONS (CONT).

Was this article helpful?

0 0

Responses

  • MINNA
    How to remove staked metal?
    8 years ago

Post a comment