I also have a happy story to tell. I ordered my PTAC M4-style upper on the 17th, got it the 22nd, attached a good Nikon scope & took it out to the 25yd range & shot it the next day (in a quartering Arctic gale) and zeroed it in 11 rounds of PMC 62gr., the final 5rds printing 3/8" c-to-c. That's about 1.5 MOA. This is the 1:7 twist 16" bbl, w/ BCG that was selling for about $275. I mated it to a 80% polymer lower I finished with about a horrible 12# trigger. (Total outlay about $425, but I still have to get a carry handle.) Whether this accuracy lasts is another story, along with rapid fire strings & 600yd performance, but right now I am one happy camper! Thanks for doing a great job, guys!