| 摘要 |
<p>A gas port is provided in the barrel of the arm to direct gases from the barrel against a piston: a piston rod connected to the piston contacts a sear and is forced into a latched position with an extractor/ejector spring in compressed condition. When the action of the firearm is broken, a lug contacts an extractor having a camming surface contacting the sear. The motion of the extractor caused by the lug forces the sear out of engagement, permitting the ejector spring to rapidly expend and eject the fired cartridge. When the cartridge has not been fired, no gases are directed against the piston and the ejector sear remains in an unlatched position, permitting the ejector spring to gently extract the cartridge as the action is broken; the unfired cartridge remains in the breech of the barrel and is not ejected.</p> |
