Do you have a budget? You might consider the already mentioned Colt LE6920. You mentioned wanting rails. It comes with a standard handgaurd, but you could put on a Magpul MOE handgaurd with rail sections if you like for about $50. Aluminum quad rails can drive up the cost quite a bit.
Colt, Bravo Company and Daniel Defense are brands I'd trust my life with. For a strictly range gun, you could go a bit cheaper as potential failures would only be a frustration as opposed to a deadly situation. Still, you can get rifles from those brands for $100-$200 more than a similar budget rifle.
Are you fairly handy? It's not difficult to assemble one. All of my future ARs will be built by myself as I can build them with quality parts exactly how I like them.