| 摘要 |
A shotgun includes a gas-operated action. The gas operated action includes a cylinder having at least one wall, a piston, and a resilient member. The resilient member is positioned between the piston and the wall of the cylinder to prevent high pressure gas from escaping between the piston and the wall of the cylinder. The resilient member and any surface that the resilient member is in contact with do not move relative to each other when the piston moves.
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