| 摘要 |
A gas operating system (5) for a firearm renders the firearm capable of f iring a wide range of shot loads by passively and/or automatically compensat ing for different shot loads. The firearm includes a plurality of ports (210 , 212, 214, 230, 232, 234) formed in the firearm barrel, and corresponding p orts (110, 112, 114, 130, 132, 134) formed in a gas cylinder (100) of the ga s operating system. The ports tap gases generated during firing which are us ed to cycle the firearm. When firing different cartridge loads, differing co mbinations of the ports are selectively at least partially blocked or otherw ise obstructed by the cartridge casing according to the size of the cartridg e.
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