.50 GI

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The .50 GI (12.7×23mmRB) pistol cartridge was developed by 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 M1911. The round has a rebated rim that is the same diameter as that of the .45 ACP. In 2006, Guncrafter Industries introduced its 1911 Model No. 2, which sports a full-length light rail/dust cover and is chambered for the .50 GI cartridge. Both the M1 and the M2 can be fitted with Guncrafter Industries' .45 ACP conversion unit. The .45 ACP magazines hold 8 rounds. Physically, the .50 GI round is wider than the .45 ACP and slightly longer. The M1 and M2 magazines can hold seven rounds. The Glock conversion can hold eight rounds in the standard magazine and nine with the extended base pad.