A device that can be affixed to the muzzle end of a firearm barrel. When the firearm is fired, the gases following the bullet down the bore expand into the chamber of the device and exert a backward force on the barrel face, accelerating the rearward movement of the barrel and the breech locked to it. Some primary applications of this principle are machine guns, pistol suppressors, and blank firing adaptors. Also known as a recoil intensifier.
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