a. General. Inspect all parts for damage, excessive wear which might cause malfunction, burrs, rust, foreign matter in recesses, deformation and free action with mating parts. Reference is made below to pages in the preceding section for inspection of corresponding components of the trigger housing group.

b. Trigger Housing (Fig. 56). See page 62 for inspection of the trigger housing. Also inspect the selector spring retention slot in left magazine post for foreign matter and positive spring seating so that- spring will not turn when assembled.

c. Hammer (Fig. 56). See page 63 for inspection of the hammer. Also inspect milled cut on lower right sight of hammer, which allows clearance for disconnector, for burrs and wear (Fig. 49).

e. Trigger (Fig. 56). See page 64 for inspection of the trigger.

f. Trigger Spring (Fig. 56). See page 64 for inspection of the trigger spring.

g. Sear (Fig. 56). See page 64 for inspection of the sear. Also inspect top front portion (camming surface for disconnector) for burrs and wear.

h. Sear Spring (Fig. 56). Check sear spring for positive seating in trigger and gear. Check for functioning, rust and set. Visually inspect during repair. Replace during rebuild.

L Safety (Fig. 56). See page 65 for inspection of the safety.

j. Magazine Catch (Fig. 56). See page 56 for inspection of the magazine catch.

k. Disconnector (Fig. 56). See that bearing slot in front end of disconnector is free from foreign matter and burrs and is lightly lubricated. See that disconnector spring is not weak, rusted, or broken, that spring well is free of foreign

Figure 56. Trigger housing group - carbines M2 and M3.

matter, and that plunger is free of burrs. Lubricate plunger occasionally. Expanded end of coil of spring should seat in plunger for retention. Check rear end of disconnector for burrs and wear.

/. Disconnector Lever Assembly (Fig. 56). Examine the rivet of the disconnector lever assembly which pivots the lever in the flat crank shaped end of the pin, to determine that the rivet is secure, that the hole in the crank of the pin is not enlarged, that this pivot is free from burrs, and is not worn. See that lever is not distorted or twisted on rivet, that it is free to rotate on the rivet and that ends are free from burrs and wear. Offset in rear section of lever is for alignment with disconnector and should not be straightened. Be sure toe (front end) of lever bears squarely on cam on operating slide and is (slide retracted) under raised boss when lever is fully seated in the housing. See that holes in trigger housing for pin of disconnector lever assembly are not enlarged.

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Rear end should not bind in earn of disconnector when assembled. Examine pin of disconnector lever assembly to see that pivot areas are free from burrs and not worn. Keep pivots lightly lubricated. If the pin is rotated by the selector so as to permit inadequate positioning of lever in full automatic fire, inspect the straddle cuts in pin which engage the selector. They must be free from burrs, must retain selector firmly, and must not be worn so as to cause lost motion.

m. Selector and Spring (Fig. 56). See that disconnector pin slot in selector is not worn so it will cause lost motion or impair security. See that spring recess in rear end is free from foreign matter and will retain spring securely. See that selector spring is bent in only one plane (not twisted) and both ends seat securely in their retention recesses. If spring is loose when assembled , straighten slightly,


The repair and rebuild of the trigger housing group is essentially the same as for carbines Ml and M1A1. See page 65.


a. The assembly of the trigger, trigger spring, sear and sear spring is the same as for the carbines Ml and M1A1 (page 66). Use sear 7161841 (page 64) and magazine catch 7161842 (page 65) marked with underlined letter "M" on all carbines M2 and M3. To assemble the disconnector and hammer, place the disconnector in trigger housing so that the lug projects over the right side of the housing. Insert the hammer on the left of the disconnector so that its milled lower cut presses against the flat portion of the disconnector. Insert the hammer pin from the left side and through the hole in the hammer, line up the hole in the disconnector and push the pin through the hole in the other side of the housing. With the pin head on the left side, the pin is prevented from shifting when the carbine is assembled.

b. Insert disconnector spring plunger assembly into the hole in the top of the disconnector, spring first. Use disconnector spring plunger assembly 7162782 on all carbines M2 and M3, Line up the trigger housing with the receiver and insert the disconnector lever pin from the right side with the long leg of the lever towards the front. The rear toe of the lever should rest on the bottom surface of the projecting lug of the dis connector. Slide the slot of the selector through the grooves of the projecting portion of the disconnector lever pin. Pivot the selector to the rear position and insert straight end of the selector spring into the recess in the lower rear end of the selector; with the loop of the spring downward insert the loop end into the slot in housing magazine left post mounting slot and down to the bottom of the post.

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