I'm fairly new to AR building and I'm now starting on my second rifle. I have two different lowers on hand to choose from. Either a RRA or a PSA. Either would be fine, but what I'm looking for is an opinion on the upper assemblies. I'm going with either a 14.7 or 16 for barrel length. The prices between Del-Ton and PSA are roughly the same for the profile I'm looking at. I have seen both brands as an assembled rifle but never shot either. I'm looking for a rifle that I can make as my secondary for training as well as a rifle for my wife since I already have another AR that I prefer to keep the round count down on. I was hoping to stay in the $500 range for the upper alone. Any suggestion or thing I should know about either of the brands?