The One Horse Express Quad is a factory-built 5.56 NATO pistol made in the USA, featuring the Atrius Single Side FRS selector with Safe, Semi, and Super Semi positions. Built from the ground up, this configuration combines a 10.5-inch medium-profile barrel with a 9.25-inch handguard and carbine-length gas system. The Quad is equipped with a 1:7 twist barrel threaded 1/2x28 and fitted with an A2 muzzle device. A Breek Warhammer Mod2 charging handle, Mil-Spec buffer tube, THRiL RTG Rugged Tactical Grip, SBA5 stock, and 30-round magazine complete the factory configuration. Specifications Manufacturer: One Horse Express Model: Quad Caliber: 5.56mm NATO Selector: Atrius Single Side FRS Selector Positions: Safe / Semi / Super Semi Barrel Length: 10.5 inches Barrel Profile: Medium Twist Rate: 1:7 Muzzle Thread: 1/2x28 Gas System: Carbine Muzzle Device: A2 Handguard Length: 9.25 inches Charging Handle: Breek Warhammer Mod2 Buffer Tube: Mil-Spec Grip: THRiL RTG Rugged Tactical Grip Stock: SBA5 Magazine: 30-round Weight: 7.14 lbs. Country of Origin: U.S.A. Get it at BattleHawk Armory!