Diamondback db15 rifle features a carbine-length, medium 4150 chromemoly barrel, mid-length gas system with pinned gas block, and a shot-peened mil-spec 8620 bolt carrier.It utilizes 7075-t6 aluminum receivers, 15" m-lok anti-rotation handguard, magpul moe grip and a magpul carbine stock.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: 30+1Safety: Manual ThumbOal: 32.50"- 36.25"Weight: 6.65 lbsStock Description: Adjustable Magpul CarbineMuzzle: A2 Flash HiderReceiver Material: 7075-T6 AluminumBarrel Description: 4150 Chrome Moly MediumTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: Right HandStock Finish Group: Brown