I've been thinking of doing an AR9 for a while, but they're kind of cost prohibitive. However, I picked up a PSA upper here on the classifieds for a decent price so I'm all in now. Now I'm trying to figure out what to do about the lower. I think I want Colt mag, primarily because it looks better. The operational lrbho would be nice too. Finding a Colt lower at a reasonable price is proving difficult. I'm considering a regular lower with a KAK mag well adapter. Other people seem to like those adapters. I figure I'll be into it for close to the same money as a Glock lower after getting a new buffer and if I hate it, I can always pull the adapter and just get another rifle upper. I've been looking at the posts over there at arfcom, and those guys seem to be all over the place on this stuff. Anyone have more experience with these things and provide some useful advice?