Features:Action: Semi-AutomaticAmbidextrous Safety: NoBarrel: 7.5 inch 1:8 Twist Heavy Barrel (HBAR) ? Either 416R SS or 4150 CRMOV Nitride 1/2 x 28 threadsBrace: Not included. Comes with pistol buffer tube ONLY.Caliber: .223 Wylde (Shoots both .223 REM and 5.56 NATO)Feed Ramps: M4Finish: CerakoteFrame Material: Aluminum 7075Gas System: 0.750 Gas Block (Black Oxide) and Pistol Gas TubeGrip: Mil-spec PolymerHandguard: 7.125″ Aluminum 6061 ? Full picatinny railMagazine Capacity: 30 RoundMags included: 1Muzzle Brake: Included – Designed to be 6 degrees forward wrench tightened w/o LoctiteSights: NoneTrigger: Milspec 5.5-6 lb pullUpper Receiver: 7075Overall Length: 23.5?Weight: 5.0 lbs