The Guncrafter Industries Model No. 1 (Or M1) is a variant of the widely popular M1911 handgun, modified for the .50 GI cartridge. John Browning's 1911 .45 ACP has been used for many cartridges over the past century. In every instance the cartridge used a bullet with a diameter that was the same or smaller than the original. It was introduced at the 2004 SHOT Show, along with the .50 GI cartridge. It, like the Deagle and LAR Grizzly WM, it requires a large, heavy pistol for it to fire.