Functional Check

a. For functional check of the trigger housing, hammer, trigger, sear, magazine catch, and trigger pull, see page 67.

b. Set for semiautomatic fire. Squeeze the trigger, cock the hammer, and forcibly strike the grip of the stock with the heel of the hand several times. If the hammer falls, the group is not acceptable because it will tend to fire in an uncontrolled manner.

c. With the trigger housing assembled to the receiver, check functioning of all moving parts at full and semiautomatic settings.

d. Check to assure that there is no binding between hammer, disconnector, and housing.

e When the carbine M2 is set for automatic fire with the trigger pulled back, the hammer must fall when the operating slide is slowly pushed all the way forward. When set for semiautomatic fire, the toe of the disconnector lever should clear the cam on the operating slide to assure that the hammer will not be released.

f. Check trigger pull (page 50).

SECTION V. OPERATING SLIDE ASSEMBLY

DISASSEMBLY

a. Refer to page 7 for instructions on removal from carbine and disassembly of the operating slide assembly.

b. Before the operating slide on the carbines M2 and M3 can be removed, the disconnector lever must be removed first.

INSPECTION

a. Operating Slide (Fig. 57). Check slide for bent or cracked rear bar, deformation, excessively worn guide lugs, burrs, and corrosion. Inspect bolt camming lug recess for wear and burrs. Inspect spring guide seating recess in rear face for wear, burrs, and foreign matter. Inspect front race of slide where it contacts piston for levelness. Un-evenesB at this point may cause malfunction. Check camming surfaces for burrs and wear (Fig. 58). Inspect the operating slide under "black light" for cracks in the areas specified below (DEPOT MAINTENANCE ONLY). Reject slides having cracks around the operating cam, at the junction of the inertia block and arm, and around the disconnector lever cam on M2 type slide 7161843. Check visually and reject operating slides showing breaks around the hole for the operating slide stop. Cracks at this point are acceptable. Use operating slide 5357151 (usable) or operating slide 7160091 (preferred) on carbines Ml and M1A1 until the supply is exhausted, then use 7161843 (Fig. 58). Until the supply of the two former slides is exhausted, conserve operating slides 7161843 for use on carbines M2 and M3.

b. Operating Slide Stop and Stop Spring (Fig. 57).

(1) For depot maintenance, check to assure that stop 7312452 and spring 7312453 are used. For field maintenance, old type is satisfactory if it functions properly.

(2) Inspect stop for wear and burrs, looseness in operating slide, and rust. Inspect stop spring for functioning, lack of friction with stop, and for set. Inspect spring for foreign matter.

c. Operating Slide Spring (Fig. 74). Inspect operatng slide spring for set, broken coils, and distortion. Refer to TB ORD 366 for operating Blide spring standards.

d. Operating Slide-spring Guide (Fig. 74). Inspect operating slide spring guide for deformation, burrs worn or burred nose, and rust. Shank of guide should be straight. Nose of guide should be free from burrs to insure positive seating in its recess in rear face of operating slide. With spring assembled to guide, insert in housing, or in housing tube in early type receivers, and hand operate to test freedom of movement.

e. Slide Spring Housing (early type receiuers). Inspect inside and outside of operating slide spring housing for dents, splits, rust, and foreign matter. Inspect spring retainer for looseness in tube and positioning lug on retainer for burrs and wear. Some tubes have a pressed out lug on the side and a slot in the rear. This lug seats in the operating

Smontaggio Carbine

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