Greetings all. IN a few days, I intend to take the plunge and finally purchase an AR-15. That being said, the setup I am looking for is a 16" bbl Midlength Gas system with collapsible stock; as for fixed vs/ detachable carry handle, chrome moly/chrome-lined/stainless barrel, and which gas block to use, I am still up in the air (help on that, please?). That being said, I know there are a couple of manufacturers who make complete rifles in this setup (that is what I am after, for my own reasons--please don't suggest mating a lower and upper, I want a factory-built rifle), but cannot decide which manufacturer to pursue. What, in anyone's opinion, would be the best manufacturer to look into for this setup? Thanks!