breech closer

Thesaurus

Noun

1.breech closer - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firingbreechblockblockage, stoppage, occlusion, closure, block, stop - an obstruction in a pipe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