I bought one a few years ago after going through an instructor/armorer course for work on the M&P 15T. The Sport is the base model S&W AR, and does not have a dust cover or forward assist. I usually run a few hundred rounds through it a year, including running drills with it during semi annual long gun training. I haven't had any reliability issues with it, and it has been fun to shoot.I 'm thinking of getting one of these. The reviews are all good. Thought I'd check here. First shot.