The One Horse Express Atrius Forced Reset 5.56/.223 Rifle is factory-built around the preinstalled Atrius Single Side Forced Reset Selector, with three selectable positions: SAFE, SEMI, and SUPER SEMI. One Horse fits, times, tests, and tunes the selector at the factory as part of the complete rifle configuration. Built in the USA, the Express features a 16-inch SOCOM-profile 5.56 NATO barrel with a 1:8 twist and mid-length gas system. A 15-inch Express M-LOK handguard, A2 muzzle device, Breek Arms Warhammer MOD2 ambidextrous charging handle, THRiL RTG Rugged Tactical Grip, and THRiL CCS stock complete the factory configuration. Specifications Manufacturer: One Horse Model: Express Caliber: 5.56mm NATO / .223 Remington Barrel Length: 16 inches Barrel Profile: SOCOM Twist Rate: 1:8 Gas System: Mid-Length Muzzle Thread: 1/2x28 Muzzle Device: A2 Handguard: 15-inch Express M-LOK Selector: Atrius Single Side FRS Selector Positions: SAFE / SEMI / SUPER SEMI Charging Handle: Breek Arms Warhammer MOD2 Buffer Tube: Mil-Spec Grip: THRiL RTG Rugged Tactical Grip Stock: THRiL CCS Magazine: 1x 30-round Weight: 7.14 lbs. Country of Origin: USA Package: Factory-Installed Atrius Single Side FRS and 1x 30-round magazine Get it at BattleHawk Armory!