Receiver Assemblymaintenance Instructions Cont



Solid Film Lubricant (SFL) is the authorized touchup for the M203/M203A1 Grenade Launcher and may be used on up to one third of the exterior finish of the weapon.

FOR CONUS USE ONLY: Solid Film Lubricant (item 11, app D) may be used as a touchup without limitation on the receiver assembly. This is to say that units which DO NOT fall under the category of Divisional Combat Units or rapid deployment type units may have up to 100 percent of the exterior surface of the receiver assembly protected with SFL. Prior to application of SFL, the surface must be thoroughly cleaned and inspected for corrosion and/or damage. If corroded or damaged, the part must be repaired or replaced prior to application of SFL. Continued use under combat conditions would result in an unprotected surface when the SFL wears off. This would result in a large light reflecting surface and accelerated deterioration of the unprotected surface. Therefore, Divisional Combat Units and units which fall under the definition of Rapid Deployment type must adhere to the limitation of NOT over one third of their exterior surface covered by SFL.

If a M203/M203A1 Grenade Launcher RECEIVER Assembly is missing one third or more of its exterior protective finish, resulting in an unprotected/light reflecting surface, it is a candidate for overhaul. This missing finish will be considered a shortcoming. This shortcoming requires action to obtain a replacement weapon. Once a replacement has been received, evacuate the original weapon to depot for overhaul.

Once the missing exterior protective finish of the receiver assembly has exceeded one third of its total surface, the probability of reclaiming the receiver assembly during overhaul diminishes rapidly. In order to extend the life of the receiver assembly, which is the serial numbered item, it is necessary to evacuate the weapon to depot once the missing finish reaches one third of the total surface of the receiver assembly.


Except for disassembly of the cartridge extractor and trigger guard, disassemble in the following order. Not following this order may result in damage to components.


Make sure that grenade launcher is cleared and cocked before starting disassembly procedures. Remove screw thread insert when required for repair.

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

1. Remove headless straight pin (1) to release torsion helical spring (2) and barrel stop (3).

M203A1 requires removal of peening.


Remove headless straight pin only when barrel latch or compression helical spring requires replacement.

2. Remove headless straight pin (4) to release barrel latch (5) and compression helical spring


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

3. Remove and discard self-locking screw (7) from back plate (8). Remove back plate (8) and follower guide assembly (9) from receiver.


The old part number for the back plate (8) is 8448314, and the old part number for the follower guide assembly (9) is 8448387.. The current configuration of the back plate and follower guide assembly is shown. The previous configuration follower guide assembly contained a captured spring and detent, therefore, it did not require a screw. The old type back plate and follower guide assembly only need to be replaced if defective. If the old configuration or either the back plate or the follower guide assembly requires replacement, both parts must be replaced, as old to new configurations are not compatible.

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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