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From the fourth Dirty Harry movie, "Sudden Impact," the .44 Auto Mag pistol is a large caliber semi-automatic pistol produced from 1971-1982. The short-recoil operated Auto Mag pistol featured a rotary bolt with six locking lugs located at the front similar to the M16/AR-15 rifle. The .44 Auto Mag was designed to shoot .429-inch, 240-grain bullets with comparable velocity to the .44 Magnum revolver, which is probably why it appealed to Dirty Harry Callahan.