| http://www.w3.org/ns/prov#value | - matic firearm, a receiver, a breechmechanism movable therein, including a breech bolt, a barrel extending forwardly from the receiver, a cylinder arranged under the barrel and in communication with a. gas port in the barrel, a piston operating in said cylinder and operatively connected with said breech mechanism, and quicleacting means including a cam member for detachably clamping said cylinder t
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