I bought a bushmaster once. I will never make that mistake again. That rifle would short cycle anything not loaded to max pressure. I would not trade my M&P 15 for any amount of money. That rifle cycles premo ammo and trash ammo without a hiccup, and it prints 1/2" groups at 100 yards. My father has an Olympic Arms AR and that thing is as reliable and accurate as my S&W. I don't know why more folks don't consider Olympic Arms, because they make a great rifle.