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How a Daewoo USAS-12 Shotgun Works

Wikipedia: Type Automatic shotgun Semi-automatic (Civilian) Place of origin South Korea Service history Used by See Users Production history Designer John Trevor Jr. Designed 1989 Manufacturer Daewoo Precision Industries, Interord Corp.(Nashville, Tennessee,) RAMO Defense Co., Ameetec Arms LLC Produced 1989–present No. built 30,000[1] Variants Semi-automatic only for civilian commercial sales; select-fire for military and police Specifications Mass 5.45 kg without magazine 6.2 kg with 10-round magazine Length 960 mm Barrel length 460 mm Caliber 12-gauge Rate of fire 400-450 rounds per minute Muzzle velocity 400 m/s (1,300 ft/s) Effective firing range 30–40 m Maximum firing range 50 m Feed system 10-round detachable box magazine or 20-round drum magazine Sights Iron sights