I've had 5 different manufacturers AR's over the years and there is not that much difference. The heart of the AR is the barrel. the trigger and sights are the other variables. Most of what is out there is good quality. I have one DPMS and like it a lot. It's comparable to my Bushmaster. I think it's nicer than the Oly I used to own. Colts are...............different. You either love em or detest em. IMHO AR's are like 1911 Govt. models, some are nice than others but they pretty much do the same thing.