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

1880–85; breech + block Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
breechblock (ˈbriːtʃˌblɒk)
a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Early breechloaders incorporated a sharpened cutter blade atop the breechblock.
The breechblock is then held to the rear while the barrel is driven forward by its own spring.
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