rear of tube
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|Noun||1.||rear of tube - opening in the rear of the barrel of a gun where bullets can be loaded|
breech closer, breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing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"