Also known as breech block
thumb|400px|right|Illustration of some firearm breechblocks A breechblock (or breech block) is the part of the firearm action that closes the breech of a breech loading weapon (whether small arms or artillery) before or at the moment of firing. It seals the breech and contains the pressure generated by the ignited propellant. Retracting the breechblock allows the chamber to be loaded with a cartridge.
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- Иллюстрации к статье «Затвор». Таблица II. Военная энциклопедия Сытина (Санкт-Петербург, 1911-1915).jpg
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- Commons category
- Gun breech locks
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