Action: Semi-Automatic - Ambidextrous Safety: No - Barrel: 16 inch 1:8 Twist Heavy Barrel (HBAR) Either 416R SS or 4150 CRMOV Nitride 1/2 x 28 threads - Caliber: .223 Wylde (Shoots both .223 REM and 5.56 NATO) - Feed Ramps: M4 - Finish: Cerakote - Frame Material: Aluminum 7075 - Gas System: 0.750 Gas Block (Black Oxide) and Carbine Gas Tube - Grip: Mil-spec Polymer - Handguard: 15.25 Aluminum 6061 Full picatinny rail - Magazine Capacity: 30 Round - Mags included: 1 - Muzzle Brake: Included Designed to be 6 degrees forward wrench tightened w/o Loctite - Sights: None - Trigger: Milspec 5.5-6 lb pull - Upper: 7075 Upper - Overall Length: 33.25 - Weight: 6.8 lbs.