| 摘要 |
A rotary magazine for a firearm includes a hold-open lever that is actuated after the last shot is fired to hold the bolt in an open condition to signify that the magazine is empty. No modification to the firing mechanism, bolt or other part of the firearm is required. The hold-open lever is tripped to a hold open position by a stud or similar trip mechanism mounted to the magazine's rotor. The rotor and the magazine's feed insert are formed in a manner such that the rotor rotates an additional amount beyond its nominal original position (magazine empty), without interference from the feed insert or other structures in the magazine. When this additional rotation occurs, the trip mechanism on the rotor actuates the lever, moving it to a position in which it blocks the forward movement of the bolt. Several different arrangements for a rotary magazine with the hold open feature are described.
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