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44 Magnum revolvers in the form of a semi-auto pistol. 44 Auto Mag pistol (AMP), and was designed to harness the power of. It shot a specially developed cartridge, the. Developed by Harry Sanford, the Auto Mag pistol was intended – and has always been – as a unique firearm: a short-recoil operated pistol featuring a rotary bolt with locking lugs (similar to the AR-15 rifle action).
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