| 摘要 |
A device for automatically feeding spare cartridges in the magazine tube into the firing chamber of a shotgun of the type comprising a piston mechanism for successively feeding the spare cartridge. The mechanism comprises a cup shaped piston receiver, a cup shaped piston slidable along the outer surface of the piston receiver, a shaft extending in the axial direction of the piston and the piston receiver for guiding the piston, the piston and piston receiver cooperating to define a gas chamber, a conduit for supplying the gas generated at the time of firing into the gas chamber, and means for discharging the gas from the gas chamber when the piston is moved to one of the extreme positions by the gas admitted into the gas chamber.
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