M203 Launcher Self Locking Screw

Item No.

Interval

Item To Be Checked Or Serviced

Procedure

Not Fully Mission Capable If:

(cont)

a. Inspect for burrs, nicks, wear, or other damage.

b. Inspect for missing finish on weapon. Apply solid film lubricant to shiny surfaces.

Burred, nicked, worn, or damaged.

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 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.

Change 1

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

UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR 40MM GRENADE LAUNCHER,

M203/M203A1 (CONT)

Item No.

Interval

Item To Be Checked Or Serviced

Procedure

Not Fully Mission Capable If:

4

Quarterly (cont)

Receiver assembly (cont)

c. Check self-locking screw in back plate for tightness (p 232).

d. Check the breech insert visually.

It should not be above the surface of the breech face. Evacuate to direct support maintenance.

Self-locking screw is not tight.

Breech insert protrudes above the breech face.

5

Quarterly

Barrel stop

With barrel assembly installed on the receiver assembly, move barrel assembly forward to barrel stop. Barrel stop must prevent the barrel assembly from being removed from the tracks in the receiver assembly. Verify barrel stop pin is staked on both sides.

Barrel stop does not prevent the barrel assembly from being removed from the receiver assembly.

6

Quarterly

Barrel latch

Pull barrel assembly rearward to close. Barrel latch must lock the barrel assembly fully closed.

Barrel latch does not lock barrel assembly fully closed.

7

Quarterly

Cartridge extractor

Check for broken or missing cartridge extractor, spring pin, or spring.

Cartridge extractor, spring pin, or spring is broken or missing.

8

Quarterly

Cartridge ejector

Visually inspect cartridge ejector for cracks. Push cartridge ejector into breech. Cartridge ejector should move and return under spring pressure.

Cartridge ejector is cracked or not moving and returning under spring pressure.

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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