rear of tube

Thesaurus

Noun

1.

rear of tube - opening in the rear of the barrel of a gun where bullets can be loaded breech, rear of barrel barrel, cask - a cylindrical container that holds liquids breech closer, breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing opening - a vacant or unobstructed space that is man-made; "they left a small opening for the cat at the bottom of the door"