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, a2 carbine length plastic hand guard, and standard charging handle.The am15 br 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.Metal Finish: Black Hardcoat AnodizedAction: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: 30+1Safety: ManualOal: 32.50"-36.13"Weight: 6.20 lbsStock Description: 6 PositionMuzzle: A2 Flash HiderReceiver Material: 7075 T6 AluminumSights: None, Optic ReadyBarrel Description: 4150 Chrome Moly VanadiumTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black