Diamondback firearms db15 rifle uses a gas-impingement system and high quality cnc machined components.Features a 4140 chrome moly barrel, a3 flattop upper receiver, carbine length gas system, 15" m-lok rail, moe grip, a2 flash hider muzzle and a magpul moe carbine stock.Made in the usa.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: 30+1Safety: ThumbOal: 32.50"- 35.75"Weight: 6.65 lbsStock Description: Adjustable Magpul CarbineMuzzle: A2 Flash HiderReceiver Material: 7075-T6 AluminumSights: Optic ReadyBarrel Description: Chromoly SteelTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: Right HandStock Finish Group: BlackMetal Finish Group: Blued/Black