So I ordered my AR-15 lower last week (Stag with a 4 position) and I'm looking around at uppers. The local shop wants to sell me a Stag for $535 (has to be ordered). However, I've been looking around a little and have found a couple of options. Stag $535 + Tax = $570 Local shop Olympic Arms $436 + S&H = $451 - Online RRA CAR $495 + S&H = $510 - Cold War shooters So I can save anywhere from $60 to $120 over my local shop. Note these are all M4 complete uppers. Is there any difference in quality that I need to be aware of? Or just go with the cheapest to save the bucks? Olympic's site doesn't specify if their upper is chrome lined or not, so I have to assume that it isn't because of the price difference. I won't be shooting in any competitions with this rifle, it's just for fun, and for shooting stray coyotes/boars in my back yard.