| 摘要 |
A stable automatic or semi-automatic firearm having a differential recoil system in which an open bolt has a designed mass and closing velocity to impact and drive a reciprocating barrel forwardly without rebound and remain locked to the barrel during the period when there is high firing pressure in the barrel. Since the bolt supports the cartridge during the time of high pressure, the cartridge is prevented from prematurely being extracted and rupturing; and since recoil momentum is utilized in arresting and returning the bolt, stability of the firearm is improved.
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