Definitions for ".50 GI"
The .50 GI pistol cartridge was developed by Vic Tibbets and Alex Zimmermann of Guncrafter Industries. The .50 GI was introduced at the 2004 Shot Show alongside the Guncrafter Industries Model No. 1, a variation of the 1911. The round has a rebated rim that is the same diameter as that of the .45 ACP.