This am-15 optic ready rifle is chambered in.223/5.56 and has a 16" chrome moly vanadium steel barrel with an m4 contour and 1:8" twist.The receivers are forged, a2 hand-guard, 6-position butt-stock, a2 pistol grip, a2 flash hider, anderson's proprietary 17-4 stainless steel match grade trigger and hammer, standard charging handle, single point sling mount, one 30-round magazine.Metal Finish: Black Hardcoat AnodizedAction: Semi-AutoCaliber: 223 RemBarrel Length: 16"Capacity: 30+1Trigger: Match GradeSafety: LeverOal: 32.50"-36.13"Weight: 6.20 lbsStock Description: Adjustable M4 AndersonMuzzle: A2 Flash HiderReceiver Material: 7075 T6 AluminumSights: None, Optic ReadyBarrel Description: 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