Anderson's am15 optic ready firearm is chambered in.223/5.56 comes with a 16" chrome moly vanadium steel m4 contour barrel with a 1-8 twist.It features forged 7075 t6 receivers, 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, and one thirty round magazine.This firearm features the rf85 coating, firing with 85 percent less friction, a 23 percent faster action, and cleans up with soap and water no oil is needed.Metal Finish: Black Hardcoat AnodizedAction: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16"Capacity: 30+1Trigger: Match GradeSafety: LeverOal: 32.60"- 36.13"Weight: 6.20 lbsStock Description: Adjustable M4 AndersonMuzzle: A2 Flash HiderReceiver Material: 7075-T6 AluminumSights: Picatinny RailBarrel 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