I've owned a S&W Sport AR for over a year now and have over 2300 rounds fired so far. It's never had a failure of any type in all those rounds fired. The only down side is that is will **** off some of the other AR shooters. Because they spent big $$$ on their rifle and it won't shoot as well as the Sport. With Federal M193 55gr ammo, mine will shoot .65" groups at 100yards. A couple of guys were watching me shoot 3 shot groups and ask me if I could repeat the shot group again. So I aimed at one of the other Shoot and See targets and did it again. They were not happy that their $2K plus rifles wouldn't do that well!!!