A R M -4 Barrel, chrome moly steel, 1x9 twist barrel mounted on A-2 (pictured) or flat-top upper. Comes standard with our Military M -4 style hand guards, 6 position ARM -4 stock, and A-2 flash-hider.

 This AR-15 Rifle kit is headspaced, and ready to mount to your lower receiver.  Once you have an assembled lower with the parts provided in the kit, and mount the upper,  this is an operational firearm 5.56mm.