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