A caliber conversion sleeve (known by many names, including cartridge conversion sleeve, supplemental chamber, chamber insert, subgauge insert, subgauge tube, adapter sleeve, or gauge reducer) is a device which can be used to non-permanently alter a firearm to allow it to fire a different cartridge than the one it was originally designed to fire.
Other articles related to "caliber conversion sleeve, conversions, caliber":
... Some European conversions exist for special gallery cartridges, similar in concept to the.22 CB rounds, which use a primer but no gunpowder ... handgun collection in his office but none of them matched the caliber of the bullet he used to kill the victim and Columbo had to figure out what happened to the gun the killer used to commit the crime ...
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“The conversion of a savage to Christianity is the conversion of Christianity to savagery.”
—George Bernard Shaw (18561950)