450 BUSHMASTER RILFE FEATURES - Action: Semi-Automatic - Ambidextrous Safety: No - Barrel: 18 inch 1:24 Twist Either 416R SS or 4150 CRMOV Nitride 11/16 x 24 threads - Caliber: .450 Bushmaster - Feed Ramps: Modified M4 - Finish: Cerakote - Frame Material: Aluminum 7075 - Gas System: 0.750 Gas Block and Mid Length Gas Tube - Grip: Mil-spec Polymer - Handguard: 15.25 Aluminum 6061 Full picatinny rail - Magazine Capacity: 5 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 Oversized Upper - Overall Length: 35.00 - Weight: 6.4 lbs