Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of breechblock is as below...

Breechblock :: Breechblock (n.) The movable piece which closes the breech of a breech-loading firearm, and resists the backward force of the discharge. It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired..

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