automatic breech mechanism

automatic breech mechanism

[¦ȯd·ə¦mad·ik ′brēch ‚mek·ə′niz·əm]
(ordnance)
A device that utilizes the energy of recoil, or the pressure of the powder gases, to open the breech, withdraw the fired cartridge case, insert a new cartridge, and close the breech.
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