Features: Action: Semi-Automatic Ambidextrous Safety: No Barrel: 7.5 inch 1:8 Twist Heavy Barrel (HBAR) - Either 416R SS or 4150 CRMOV Nitride 1/2 x 28 threads Brace: Not included. Comes with pistol buffer tube ONLY. 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 Pistol Gas Tube Grip: Mil-spec Polymer Handguard: 7.125" 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 Receiver: 7075 Overall Length: 23.5" Weight: 5.0 lbs