Only had one hiccup. I originally I had an Aero Percision Bolt Carrier Group with the cotter pin firing pin stop. After about 5 rounds that pin backed out and made contact with the receiver. I stopped, took it home and took it apart to see what the issuer was. Replaced with a Litner Wise Bolt Carrier Group and no issues since then. I have since installed the Litner Wise pin into the Aero Precision BCG and had my Son shoot it in his AR for about 500 rounds. Works great now. So I now have a spare BCG.
Pretty good shooter so far. That was my first 20 rounds at 100 yards using 855 ammo after zeroing it at 50 yards.
I have put another 150 rounds through it since. Mostly at AR500 plates at 200 and 300 yards. It has no troubles with the 8" and 12" plates respectively at those ranges.
I am pleased with it so far.