breech block

breechblock

[breech-blok]
noun Ordnance.
a movable piece of metal for closing the breech in certain firearms.
Also, breech-block.


Origin:
1880–85; breech + block

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World English Dictionary
breechblock (ˈbriːtʃˌblɒk)
 
n
a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing

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