| 摘要 |
In an autoloading firearm for firing rounds of caseless ammunition, the extraction of unspent rounds is effected by an extractor which is a part of the reciprocating bolt and engages the forward end of the round to effect withdrawal of an unspent round upon movement of the bolt from battery. Locking and unlocking of the bolt in battery is effected by movement of the firing pin either manually, or, in normal operation, by gas pressure acting thereon in response to firing of a round.
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