breechblock

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breech·block

 (brēch′blŏk′)
n.
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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

breechblock

(ˈbriːtʃˌblɒk)
n
(Firearms, Gunnery, Ordnance & Artillery) a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

breech•block

(ˈbritʃˌblɒk)

n.
a movable piece of metal for closing the breech in certain firearms.
[1880–85]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firingbreechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing
blockage, stoppage, occlusion, closure, block, stop - an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"
breech, rear of barrel, rear of tube - opening in the rear of the barrel of a gun where bullets can be loaded
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
In this unlocked action, the weight of the internal steel breech block was increased to tame the vigorous push of the 10mm round.
Its locking system was a small separate turning breech block in the massive slide.
To test a load, the breech block on this receiver was lowered with the operating lever that allowed a technician to insert a cartridge.
The secret to employing the mortar in the direct fire mode is the incorporation of a breech block and a pivoting base rather than the traditional base plate.
He told police that since then he had not noticed it was missing while the gun's breech block, kept in a different part of the bedroom, was also missing.
To prevent this, we suggest units check the breech block roller to make sure it's rolling freely.
A massive breech block containing the firing pin pivots on the bottom so that when it is "rolled" forward it mates with the breech of the rifle to seal the action.
Pulling down the trigger guard rotated the breech block, ejecting the spent case and allowing the magazine spring to push a metallic rimfire cartridge forward.
The company's silicone stuffers range in size from 3,200 cc to 50 liters (8-135 lbs.) and feature a sliding breech block to simplify loading of compound.
Inside, you'll find a solid steel breech block insert, a steel barrel, and a steel striker-type firing mechanism for plenty of strength where it's needed.