Other than the loud muzzle break it was fun to shoot. I shot Federal XM mil-spec FMJ and Federal American Eagle 55 Grain FMJ. The barrel is used and I will replace it as I don't like the muzzle break at all-even with Peltors on! The lower is Rock River Arms LAR-15 and the the upper is A2. Glad I bought my gun before this sniper crap.