Jisho

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Noun
1. chamber (of a gun)
Wikipedia definition
2. Chamber (firearms)In firearms, the chamber is that portion of the barrel or firing cylinder in which the cartridge is inserted prior to being fired. Rifles and pistols generally have a single chamber in their barrels, while revolvers have multiple chambers in their cylinders and no chamber in their barrel. Thus rifles and pistols can be fired even with detached magazine, while a revolver cannot be fired with its cylinder swung out.
Read “Chamber (firearms)” on English Wikipedia
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