Importance

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Abstract

An autoloading shotgun having a receiver, a barrel projecting from the receiver, a magazine tube supported on the receiver in parallel relation to the barrel, a generally cylindrical gas cylinder mounted in fixed position relative to the barrel and coaxially surrounding relation to an associated portion of the magazine tube, and in an annular piston received within the gas chamber and coaxially surrounding an associated portion of the magazine tube and supported for movement along the magazine tube and toward and away from the receiver. The gas cylinder, magazine tube and piston cooperate to define an annular a gas chamber in communication with the shotgun bore. An obturation ring coaxially surrounding the magazine tube forward of the gas cylinder is biased into engagement with an annular seating surface on the forward end of the gas cylinder to provide a closure for gas ports communicating with the gas chamber and opening through the seating surface. The obturation ring moves along the magazine tube and away from the gas cylinder to vent gases of explosion from the gas cylinder when the pressure within the gas cylinder exceeds a predetermined magnitude.

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First Claim