Breechblock meaning

brēch'blŏk'
The metal part that closes the breech end of the barrel of a breechloading gun and that is removed to insert a cartridge and replaced before firing.
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The block in a breech-loading gun which when closed receives the force of the combustion of the charge.
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The metal block that closes the breech of a breech-loading gun after insertion of the cartridge.
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