We get to figure out how many of you can tell a breechblock from a breach cloth.    From Wordnik.com.  [David E.] Reference

Brad noted that Rimov was staring at the intensity slide visible on the breechblock of his sheathed weapon.    From Wordnik.com.  [The Universe — or Nothing] Reference

That way, because # .22 caliber long rifle cartridge is rim-fire ignited, the plunger, when released by the trigger, would both fire the piece and act as a breechblock.    From Wordnik.com.  [Will]

In the bore, pent in by the polished breechblock, is a cartridge which has failed in its duty.    From Wordnik.com.  [A Gunner Aboard the "Yankee"] Reference

Captain Brownson had noticed the incident and he sent word to delay opening the breechblock until all danger of explosion had passed.    From Wordnik.com.  [A Gunner Aboard the "Yankee"] Reference

First he transferred Eddie's ammunition to his own person, and such valuables and trinkets as he thought "maw" might be glad to have, then he removed the breechblock from.    From Wordnik.com.  [The Mucker] Reference

One is hastily procured, and the first captain -- a great, brawny, good-natured fellow, who has spent years at sea -- deftly fastens the bight of the rope to the handle of the breechblock.    From Wordnik.com.  [A Gunner Aboard the "Yankee"] Reference

I counted eleven able seamen polishing the breechblock of the stern nine-point-two, four marines zealously relieving each other at the life-buoy, six call-boys, nine midshipmen of the watch, exclusive of naval cadets, and the higher ranks past all census.    From Wordnik.com.  [Traffics and Discoveries] Reference