Forward end of springs should be seated in its lateral notch in trigger guard body. Inspect sear for deformation and wear on forward lower camming sur- face contacting connector and rear upper camming surface contacting sear release. The rear beveling camming surface must be perfectly smooth. Inspect sear notch faces top and rear for wear. Sear notch should be smooth and not contain a sharp or wire edge.
Use a stone to smooth nose of sear notch, if burred. Exercise care to maintain a retentive angle and stone to a polish. If too much metal is removed from top face of sear, the face becomes too low to retain the slide.
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This will cause inter- ference of rear end of sear with the slide, holding sear out of engagement. Test sear retentive action after stoning, and if found questionable, replace sear Stone slide same as sear. Sear Release Stop Lever. Inspect sear release stop lever for wear and burs on forward lower surface where it contacts the connector and on the rear surface where sear release strikes. Sear nose may become expanded due to action of sear re- lease.
Replace sear release stop lever 11 , if worn as to affect the functioning of the rifle. Change and Stop Lever Spring. Di- spect change and stop lever spring for fracture or prong. Inspect spring for loose rivet and deformation. Inspect for function- ing with change lever should bear firmly in notches and sear release stop lever. Replace spring 12 if cracked, weak or damaged. Tighten rivet, if loose.
Sear Carrier Assembly. Inspect camming surfaces on sear carrier assem- bly 13 for wear and burs. Inspect for 26 loose, cracked and worn connector stop riveted on right end. Tighten connector stop in sear carrier. Replace, if worn or damaged. Trigger Connector. Inspect top bear- ing surface of trigger connector where it contacts sear and sear release stop lever. This is a crtical surface and should not be worn or burred as it would affect function of the sear and stop lever.
Inspect the rear toe of connector where it contacts the tongue in change lever aperture and front sloping surface sear carrier ramp for wear, burs and rough edges. Make certain operating and camming surfaces are not worn as to affect functioning. Remove rough edges from rear toe of connector. Replace trigger connector 15 , if camming surfaces are worn so as to affect function of connector. Inspect trigger for full action on pin with respect to trigger guard.
Make certain connector pin is riveted se- curely in place. Rear projections on the heel of trigger must be free of wear that would affect the operation of the change lever. Top rear corner should be sharp, not beveled, at the point where it enters the notch in the change lever. Inspect heel and tip for sufficient clearance with base of guard for full retraction. Remove rough edges on trigger. Replace trigger 16 if rear projections are worn as to affect the operations of the trigger.
Full text of "TM Rifle Caliber Automatic Browning MA2"
Change Lever. Inspect change lever for functioning with connector and trigger; for deformation and for free movement in trigger guard body should fit snug. Make certain lever functions freely and remains in selected positions. Replace change lever 17 if worn or does not remain in selected positions. Trigger Guard Body. Inspect trigger guard body for deformation, wear, and burred spring retaining and receiver re- tention groove rear portion.
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Trigger guard body should assemble freely to the receiver without apparent looseness or side play. Assembly Assemble the trigger guard assembly in reverse order of numerical sequence as shown in figure Functional Check a. Inspect trigger guard assembly for looseness, functioning, and co-functioning of its component parts.
Make certain the trigger guard assembly can be installed securely to receiver without apparent looseness or sideplay. Check function of trigger connector, and sear spring with trigger guard assem- bly held horizontal, tipped forward, and tipped back. If sear spring does not bear properly on forward shoulders of sear and center prong on connector, the connector will not function properly when the trigger guard is tipped. Check functioning of trig- ger, sear, and stop lever, when change lever is set at A position normal cyclic ORD F Figure Selective positions of change lever on assembled trigger guard assembly.
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When change lever is set at A position and trigger is retracted, the connector raises the forward end of the sear and sear release stop lever together and holds them up as long as the trigger is held fully retracted. The rear end of the sear is depressed and held from engagement with sear notch in slide, while the rear end of sear release stop lever is also de- pressed, preventing the sear re- lease from striking camming sur- face on rear end of sear.
When trigger is released both the sear and sear release stop lever should return to their normal positions. When change lever is set at F position and trigger partially retracted, the connector raises the forward end of the sear and sear re- lease stop lever together. As the trigger is further retracted, the connector, still rising is cammed from under front of sear by cam- ming surface on sear carrier and continues to raise the forward end of sear release stop lever, and holds it in raised position as long as the trigger is fully retracted.
Therefore, the sear is free to func- tion when acted upon by the sear release, while the rear end of the sear release stop lever is de- pressed to a point where it will not block the action of the sear release upon the camming surface of rear end of sear. This action produces the slow cyclic rate of fire. When the change lever is set at S position, the trigger is blocked by the change lever and prevented from rising, lifting the connector, and disengaging the sear.
Installation Install trigger guard assembly as shown in figure Checking Trigger Pull a.
Check trigger pull of the rifle as in- dicated in figure The force exerted to release slide is not less than 6 pounds, nor more than 10 pounds. Note: The word "creep" is defined as any per- ceptible movement in the trigger pull between the time the slack is taken up and the slide is released, with pressure applied at a uniform rate of increase over a period of not less than 10 seconds.
In testing trigger pull of rifles, the inspector will use weights totaling 6 pounds and weights totaling 10 pounds. Make certain the change lever is set at the A or F position and the rifle is cocked. Rest the weight on the floor and hook the trigger weight rod onto the trigger so that the pressure is applied about one- quarter of an inch from the lower end of the trigger fig. Check to insure the rod contacts the trigger only and does not rub against the side of trigger guard body.
Carefully raise the weight from the floor. If the 6-pound weight pulls or the pound weight fails to pull the trigger to release the slide, correct as indicated in paragraph Correcting Trigger Pull a.
(1957) TM 9-2111-1 Field Maintenance Cal. 30 Browning Automatic Rifle M1918A2
Light trigger pull. Light trigger pull is caused by foreign matter or burs in sear notch of slide or nose of sear. Burs or foreign matter prevent nose of sear from seating fully in sear notch in slide. To cor- rect, remove the foreign matter stoning the burred surfaces as prescribed in para- graph Replace worn or damaged parts. A light pull is also due to a weak or broken sear spring that does not seat the sear fully in the notch within the slide.
This can be corrected by replacement of sear spring. Excessive trigger pull. Excessive trigger pull is caused by binding of com- ponents, foreign matter in trigger guard body or burs on trigger, connector, sear pin, or sear. Correct these conditions by removing foreign matter and stoning the burred surfaces. ICC LB. Checking trigger pull. Section IV. Removal Remove the slide and piston group as shown in figure Disassembly Disassemble the slide and piston group in numerical sequence as shown in figure Inspect free action of gas piston and slide in conjunction to gas cyl- inder tube and receiver.
Piston and slide 29 should move freely in gas cylinder tube and receiver when rifle is tilted upward and downward. Inspect piston retaining spring pin for wear or damage. Replace spring pin, if damaged.
Inspect slide for deformation of side rails by pinching or springing, which could cause binding with operating mechanism or receiver, badly dented rear end indicating forzen buffer , and worn hammer pin hole. Side rails that are bent or deformed can be spread or sprung back into shape by using wooden wedges and clamping in vise with copper jaws. Check slide after repair for free movement within tube and receiver. Replace slide assembly , if worn or damaged beyond repair, c. Gas Piston Assemblies. Note: Gas piston assemblies of early manufacture fig.