Automatic Gun Having Gas Leakage Control Mechanism.
DEPARTMENT OF THE ARMY WASHINGTON DC
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This invention relates to automatic guns having bolt carriers operated by recoil movement of the gun barrel. High pressure gas is bled from the barrel into a gas tube that delivers both mechanical and fluid pressure forces to a piston impactor aligned with the bolt carrier. Special floating rings are arranged on the gas tube to provide controlled escape of high pressure gas from the tube. The floating rings are shiftable radially to compensate for manufacturing tolerance build-ups in the gun components. The invention reduces manufacturing costs and also increases field service capabilities. Author