Model: AR-10 A4 Carbine with Green or Black Furniture Caliber: .308/7.62 X 51mm NATO, 4140 steel Barrel: 16" Double Lapped, Chrome Lined Rifling Twist: RH 1:11.25" 150-175 Grain Ammo Muzzle Device: Permanentley afixed Muzzle Brake Front Sight Base: Picatinny Rail Gas Block. Top of gas block is .398 (+/- .010) lower than top of receiver Upper Receiver: Forged Flat Top Receiver with Picatinny Rail and Forward Assist 7175-T74 Aluminum Lower Receiver: 7175-T73 Aluminum (forged) Trigger: Tactical Two Stage, 1st Stage 3.5 lbs - 2nd Stage Approximately 5-6 lbs. Stock: Pinned non-collapsing buttstock Overall Length: 37.1" Weight: 9 lbs Finish: Anodized Aluminum Upper/Lower Receiver, Manganese Phosphated Steel Barrel Accuracy: 2 - 2 1/2" MOA