What did PSA replace or repair?**Update**
I received my upper back from PSA. Everything seemed to be in good working order until I took it outside. I had (2) 25rd mags, (1) 20rd mag, and (1) 10rd mag just like before. When I went outside with the 80 rounds the BCG was cycling smoothly. On my first outting with the rifle I didn't do anything special for lube. This time I had a fine layer of red bearing grease all over the moving parts. Everything felt smooth and slick after some grease.
The mags are all magpul, and none of them drop free when empty. I had one failure of the BCG to go into full battery, and by the time I was done with the 80 rounds the charging handle and BCG seem to be doing that same grinding again like things are locking up. Honestly, I'm really disappointed in the rig at this point, and I can't recommend it.
I have one in 6.5CM and it runs fine. Seems to shoot about 1 MOA with the Hornady American Gunner ammo. I haven't tried the more expensive 145 ELD match yet.