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Updated: May 11, 2025
In the gas-operated arms, a small hole is drilled in the under side of the barrel, six to eight inches from the muzzle, so that, when the bullet has passed this point, and during the time it takes it to traverse the remaining few inches to the muzzle, a certain portion of the enclosed gas is forced through this hole, where it is "trapped," in a small "gas-chamber" and its force directed against a piston or lever which, being connected with the necessary working parts of the gun by cams, links or ratchets, performs the functions of removing and ejecting the empty cartridge case, withdrawing a new cartridge from the belt, clip or magazine, and "cocking" the gun: that is, forcing the "hammer" or striker back and compressing its spring.
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