The AutoMag is a large caliber pistol designed by Harry Sanford.
The gun was conceived to put revolver power into a modern semi-automatic pistol. The Auto Mag Corporation, the company that produced the gun, was short-lived; it shipped the first gun on August 8, 1971, and declared bankruptcy on May 3, 1972. The company reopened multiple times under various names, including Arcadia Machine and Tool. Experimental designs could fire calibers such as .357 AMP and .45 ACP, with caliber changing only requiring a barrel switch. It sold for about $217.50 at launch.
The gun used the .44 AMP cartridge (10.74×33mm), along with many variants chambered for a variety of other cartridges. The cartridge is straight-walled, and is rimless, formed by trimming a .308 Winchester or .30-06 Springfield cartridge to 1.08 inches (33 mm).