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, 12" m-lok rail, moe grip, a2 flash hider muzzle and a magpul moe carbine stock.Made in the usa.This model comes with a compatible upper assembly chambered for 300 blackout.Action: Semi-AutoCaliber: 300 BlackoutBarrel Length: 16"Capacity: 30+1Safety: Manual ThumbOal: 32.50"- 35.75"Weight: 6.65 lbsStock Description: Adjustable Magpul MOE CarbineMuzzle: A2 Flash HiderReceiver Material: 7075-T6 AluminumSights: None, Optic ReadyBarrel Description: 4150 Chrome MolyTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: RightStock Finish Group: Black