Two weeks ago I bought a 16" upper from J&T Manf. from the Reno Gun Show. It is a Wilson (non-cromed)barrel but I don't remember the upper maker. I fired over 300+ rounds thru this upper and it worked perfectly!! I didn't have a single failure to feed problem!! I have seen many new AR15s being broken in before but none worked as flawlessly as this upper did. At 25 yards I was easilly getting 1/2" groups using iron sights....and I really suck with iron sights. The elevation knob was working itself a little loss after 200rnds but that is an easy fix.
I was higly impressed!!!