Anderson 76874 AM15 Optic Ready Non FR85 Semi-Automatic 223 Remington/5.56 NATO 16" 30+1 6-Pos Blk Stk Blk This AM15-Optic Ready Rifle is chambered in .223/5.56 comes with a 16 inch Chrome Moly Vanadium Steel M4 contour barrel with a 1-8 twist. Included is a forged receiver, A2 hand guard, 6 position butt stock, A2 pistol grip, A2 Flash Hider, Cmmg Trigger, Single point sling mount, one thirty round magazine. The receivers, charging handles and buffer tubes are 7075 T6.