gun breech

gun breech

[′gən ‚brēch]
(ordnance)
The mass of metal at the rear end of a cannon, from the front slope to the rear face, exclusive of the breech mechanism; in this metal are formed the seat for the breech mechanism, the powder chamber, and the slopes connecting the latter with the rifled portion of the bore.
References in periodicals archive ?
Only a few hundred were produced but Rider kept working on his parlor gun breech design until it could digest .22 caliber rimfire.
Install the MILES tank firing insulator card between the firing contacts on the right side of the main gun breech ring assembly.
Examining the five-inch gun's turret, visitors marvel that 11 men occupied this tight space dominated by the gun breech. Gunners drilled constantly to maintain a firing rate of one 50-pound projectile every four seconds--a critically important skill with the late-war advent of Japanese kamikaze attacks in the Pacific, where Kidd served.
It was during the two years in F building that I had on the job training and remember hardness testing sten gun breech blocks and testing PIAT gun springs by lifting 30lb weights on and off, one at a time.
But a chain gun uses an electric motor to draw the belt of ammunition through the gun breech. If a round misfires, which would jam a conventional gun, the chain gun's electric motor draws the round out and feeds in the next without jamming.