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Bolt (firearms) ：ウィキペディア英語版

Bolt (firearms)

A bolt is a mechanical part of a firearm that blocks the rear of the chamber while the propellant burns, but moves out of the way to allow another cartridge or shell to be inserted in the chamber.
==Description==
In manually operated firearms, such as bolt-action, lever-action, and pump-action rifles and shotguns, the bolt is held fixed by its locking lugs during firing, forcing all the expanding gas forward, and is manually withdrawn to chamber another round.
In an automatic or semi-automatic firearm, the bolt cycles back and forward between each shot, propelled by recoil or expanding gas (back) or the recoil spring (forward). When it moves back, the extractor pulls the spent casing from the chamber. When it moves forward, it strips a cartridge from the magazine and pushes it into the chamber. Once the case is clear of the chamber, the ejector kicks the case out of the weapon. The extractor and firing pin are often integral parts of the bolt. The slide of a semi-automatic pistol is a form of bolt.

抄文引用元・出典: フリー百科事典『ウィキペディア（Wikipedia）』
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