Anderson's am15 br rifle is a semi-automatic with a low profile aluminum gas block and carbine length gas tube.It utilizes a 4150 chrome moly vanadium barrel with parkerized finish and a2 flash hider, 7075-t6 forged receivers, 15" m-lok hand guard, and standard charging handle.The am15 rifle also features a 30-round aluminum magazine with an orange follower.This 223 remington model has a 16" barrel and a black hardcoat anodized finish.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: 30+1Safety: ThumbOal: 32.50"- 36.13"Weight: 7 lbsStock Description: Magpul CarbineMuzzle: A2 Flash HiderReceiver Material: 7075-T6 AluminumSights: Picatinny RailBarrel Description: Chrome Moly VanadiumTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 7 lbs to 7.99 lbsHand: Right HandStock Finish Group: Black