Gastight seal of a gun barrel

摘要

An arrangement for gastightly sealing the gap between the cartridge chamber and the bottom of an insert which is received in a gun barrel 1 to be able to fire cartridges of a smaller caliber. The gastightness is obtained substantially by providing that the neck of the subcaliber cartridge case inserted in the cartridge chamber protrudes into the bottom of the barrel insert and that the outer surface of the neck snugly fits the cylindrical surface of the insert.