breechblock

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Related to breechblocks: breech mechanism

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(Firearms, Gunnery, Ordnance & Artillery) a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing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Noun1.breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firingbreechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing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 ?
Both Holt's 1870 and 1869 models carry 1870-marked breechblocks (below).
Throughout its 20-year lifespan in the service, numerous changes were made to the Springfield Trapdoor--including stocks, triggers, lockplates, breechblocks, stampings, hammer profiles and rear sights.
Despite being a Model 1868, breechblocks will be found dated 1869 and 1870.
One and all they were also carrying .45 caliber Model 1873 carbines, commonly referred to nowadays as "trapdoors" due to their hinged breechblocks. Although both .45 caliber, the revolver used a cartridge of 1.285 inches with a 250-grain bullet over 30 grains of black powder.
When Joe Customer comes around to kick the tires, be sure to tell him to beware of breakbarrel rifles that have only pivot pins and not bolts on their breechblocks, for they surely will work loose before the first tin of pellets is gone.
Breechblocks were made of bronze and, more commonly, steel, with minor differences employed to retain the heavy, long firing pin.