50/50 with no product support - Aero Precision AR15 Stripped Upper Receiver

Out of two of these uppers I’ve built one was perfectly fine, and the other was a nightmare of problems. The face was so far out of spec the barrel was pushed visibly out of alignment, and maxed out the wind in the sights.. so I tried lapping the face and it rubbed a spot out of the inside of the receiver, and despite grinding as far as possible to the feed ramps, the upper was still out of alignment and unusable. I waisted far more time , money, effort getting tools and rebuilding this upper enough that I’ll never buy another Aero product… now I’m out and waiting weeks to see if Aero will even replace the part.