I've owned a few AR's and still currently have 2 DPMS (one in 308), 2 Rock River Arms, and a Bushmaster. of all those my DPMS has the best fit & finish their teflon coating is tough. Bushy is great to. The RRA finish chips/marks easy but had the tightest pin holes, had to ream some just to build the lower. If you look at the forging marks Colt, Bush and DPMS use the same forging.
Stay away from Colt, to many non mil spec part.
Stay away from Colt, to many non mil spec part.