breechblock

American  

[breech-blok] / ˈbritʃˌblɒk /

Or breech-block

noun

Ordnance.

1. a movable piece of metal for closing the breech in certain firearms.

---

breechblock British  

/ ˈbriːtʃˌblɒk /

noun

1. a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing

---

Etymology

Origin of breechblock

First recorded in 1880–85; breech + block

Example Sentences

The list of Russian firsts which pulls Pyatov up from obscurity starts with the adding machine, anesthesia, Antarctica, atomic fission, runs on to the wedge breechblock and the wool-combing machine.

From Time Magazine Archive

L�ger saw his fill of suffering in World War I, but the image he carried away with him was the dazzling light of a breechblock gleaming in the sun.

From Time Magazine Archive

The wooden breechblock completely did away with the heavy hydraulic recoil cylinders which were one of the distinguishing features of the seventy-five.

From The Story of the Great War, Volume IV (of 8) Champagne, Artois, Grodno; Fall of Nish; Caucasus; Mesopotamia; Development of Air Strategy; United States and the War by Miller, Francis Trevelyan

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 A Gunner Aboard the "Yankee" by Doubleday, Russell

The heavy steel breechblock of the seventy-five was replaced by a wooden block.

From The Story of the Great War, Volume IV (of 8) Champagne, Artois, Grodno; Fall of Nish; Caucasus; Mesopotamia; Development of Air Strategy; United States and the War by Miller, Francis Trevelyan