One the advice of OldOutlaw, a shooting friend for many years, I just put together my first AR. I was quick to act when Bear Creek Arsenal sent an email blast on uppers that had just come back into stock. Picked up a 16 inch stainless barrel, carbine length gas system, M4 contour barrel with a 15 inch M-lock. Stopped by a local gun show this afternoon and found an Aero Precision lower, new with a polished trigger, six position stock, etc. I've got a pretty good idea from reading here and chatting with OO what ammunition I'm going to use. Last question, and I'd appreciate any input, centers around which magazines you all find both reliable/dependable and a decent value with the former taking precedent over the latter.