Features: Barrel - 4150 Chrom Moly Vanadium Lower Receiver - Forged 7075 T6 Upper Receiver - Forged 7075 T6 Muzzle Device: A2 BIRDCAGE A2 Pistol Grip Mil-Spec Bolt Release Mil-Spec Magazine Release Mil-Spec Charging Handle Carbine Buffer Manual Safety 90 Degree 30 Round Magazine Cable Gun Lock Breach Flag Specifications: Barrel length: 16" Weight Unloaded: 6.25 lbs. Hand Guard: 15" M-Lok Barrel Twist: 1:8 Gas System: Carbine Stock: M4 with QD Threaded 1/2 x 28 barrel standard