Features:Action: Semi-AutomaticAmbidextrous Safety: NoBarrel: 16 inch 1:8 Twist Heavy Barrel (HBAR) ? Either 416R SS or 4150 CRMOV Nitride 1/2 x 28 threadsCaliber: .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 Carbine Gas TubeGrip: Mil-spec PolymerHandguard: 15.25" 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: 7075 UpperOverall Length: 33.25?Weight: 8.05 lbs.