I'm no AR Guru, but have owned Colt, Bushmaster, Stag Arms and Rock River.
Colt: Fit and finish were great, excellent but I ended up selling because people wanted them more than I did. A bit over priced in my opinion, but.... they are excellent! ( I might add I have a personal distaste for Colt though) :confused2:
Bushmaster: Use to be all I ordered, excellent rifle all the way around! Never had one problem with my two. Can't go wrong here either. Never really checked distance accuracy though, 25 yards was about all I shot with those.
Stag Arms: I think these rifles are largely overlooked for some reason. The fit and finish are excellent, much nicer than the Bushy's I've ordered for folks even! They function perfect and are plenty accurate for my marksmanship! And the owner is great to deal with!!
Rock River Arms: Currently my choice. Only hiccup was due to my reloads at one time. :wallbash: VERY accurate rifles!!! I have to admit.... I switched over mainly after a long visit with Bird (Walter Birdsong) one lazy afternoon at his place. If I could have recorded that conversation, I think everyone I played it for would swap to RRA. :cool2g: My favorite (for now) is one Bird did in Tan and Brown for me. I doubt that one will ever leave me. I have had nothing but great dealings with them since that day. Excellent product, very accurate and great people to deal with! They helped me immensely during my researching a AR SBR 9mm build. And my 7" upper just shipped from them yesterday!!!! :smile:
Never owned a DPMS, but have mixed emotions about them. Friend of mine on one agency had issues with theirs and don't know if they ever got them all resolved. That is the only instance I have heard of problems with them though. I have another friend that has one, functions flawlessly and is very accurate. To me the fit & finish leaves a bit to be desired, at least with the older ones. Maybe they have gotten better on that though.
Built a couple on CMMG parts a while back. Much better quality than I was really expecting to be honest. Feedback has been good on them although I haven't personally shot or seen them in action.
Bottom Line: I think you would be pleased with most of the ones named. Personally, I will have RRA from now on. For the money I think that is the way to go. I don't see the value added for the price on the higher end ones such as Sabre, POF, etc etc.
My vote goes for Rock River!!