FM 23-45 Basic Field Manual
19
of bolt. Ease bolt forward.
13. Separated case, which stays in
chamber when bolt is pulled to the
rear
(Do not set up loose head space.)
13. Insert the front end of a separated
case in chamber and load
14. Bullet loose in cartridge case.
Cartridge case extracted from belt
but bullet remains in belt.
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14. Do not prepare.
15. Short of broken firing pin. 15. Assemble bolt with a defective
firing pin or place 5 or 6 successive
range dummy cartridges in belt for
instruction in immediate action.
16. Weak or broken firing pin spring. 16. Same as 15.
17. Faulty engagement of firing pin and
sear notch
17. Assemble bolt with defective parts.
18. Broken sear spring. 18. Same as 17.
19. Belt feed lever pivot out, worn, or
broken
19. Assemble cover with defective part.
20. Bent or worn belt feed lever. 20. Same as 19.
21. Belt feed pawl spring out or weak. 21. Remove belt feed pawl spring.
22. Felt feed pawl pin out or partially
out.
22. Remove belt feed pawl pin.
23. Cover extractor spring out or weak. 23. Remove cover extractor spring.
24. Belt feed lever bent up (stud on lever
jumps out of cam groove.
24. Assemble with defective part.
25. Damaged extractor. 25. Same as 24.
26. Belt holding pawl out or spring weak. 26. Remove belt holding pawl.
27. Broken extractor or ejector. 27. Assemble bolt with defective part.
28. Broken or damaged T-slot, causing
misalignment and buckling of
cartridge as bolt moves forward or
failure to extract.
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28. Do not prepare.
29. Weak ejector spring causing
misalignment and buckling of
cartridge as bolt goes forward.
29. Assemble with defective part.
30. Broken barrel extension or lock
frame.
30. Assemble with defective part.
31. Defective trigger mechanism.
2
31. Do not prepare
1
Not prepared for instruction in immediate action.
2
Defective trigger mechanism may cause the gun to begin firing as soon as it is loaded
or continue to fire when the trigger is released. To remedy, unlatch the cover or twist
the belt, unload, disassemble the gun, and replace the defective part or parts.
c. Tools used in reduction of stoppages
.—The tools commonly used in the application
of immediate action are the ruptured cartridge extractor, the combination tool, and the
cleaning rod.
(1) (
a
) A ruptured cartridge case in the chamber prohibits the entrance of the
succeeding round. The ruptured cartridge extractor, commonly called "clearing plug," is
used to remove the ruptured case. This tool is furnished in two types, the cartridge
form and the Mk. IV.
1. To use the cartridge form, open cover, place ruptured cartridge extractor on
feedway against cartridge stops, and engage it with extractor on bolt. Holding down on
extractor, load it slowly and smoothly into chamber, being careful to see that the
