| 摘要 |
PROBLEM TO BE SOLVED: To prevent the rearward flying by hitting a fire needle with a hammer thereby making the quantity of projection of the tip of the fire needle always constant so as to prevent the damage of a cap, and sealing the gas at the time of unlikely discharge gas leakage with a collar. SOLUTION: The firer of a machine gun is of such a constitution that the breakdown of a cap 5 is prevented by abutting the step 2, having a projection 4a, of a fire needle 4 against the brim 9a of a cap holding hole 9 thereby fixing the quantity of projection of a fire needle 4, and even in case that the breakdown of the cap 5 unlikely should have retreated the fire needle 4, it would be sealed with a collar 22 thereby preventing the breakdown of a hammer 12, etc., and also the length of the fire needle 4A is made longer than the length of a fire needle holder 50, and the quantity of projection of the fire needle is made constant, and also at the time of unlikely breakage of the cap, it is sealed with each collar 22 and 32 thereby preventing the breakage of the hammer 12, etc.
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