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Bryant Ridge's Analysis: The AMT Automag IV is a sizable single-action semi-automatic pistol manufactured by Arcadia Machine and Tool (AMT). Designed by Harry Sanford, the inventor of the original .44 AutoMag pistol, this model is chambered for the powerful .45 Winchester Magnum round. From its introduction until 1993, it was also available in the less common 10mm Magnum cartridge. The Automag IV features a stainless steel construction and is equipped with a magazine capacity of either 7 or 8 ro …