This Anderson AM-15 multi-cal rifle features a forged aluminum lower and upper receiver, type 3 hard anodized black upper and lower receiver, open trigger guard, nitride bolt carrier finish, steal bolt carrier, 16" barrel, government profile barrel contour, 1:7 twist rate, mid-length gas system, standard charging handle, standard M16profile bolt carrier, AZ plastic hand guard, AZ style pistol grip, AZ muzzle flash hider, 6 position buffer tube, 6 position carbine butt stock, flip up rear sight.