I agree with Muddyboots, but with exceptions. If you're looking for something really specific in an AR, like I was, you may have to assemble it from parts or sub-assemblies. For example, I wanted the lightest-weight 5.56 I could make without resorting to NFA or expensive metals. So, I bought a New Frontiers polymer lower, lightweight 3-position stock, and a lightweight flat-top carbine upper. I am going to replace the hand guard on the upper with a lighter-weight one. I probably couldn't easily find a carbine with all these features in my price range. But by shopping around, I'm getting all that done for under $600.