I know this is an old thread, but I bought a PSA lower about a year ago, and man, I was impressed with the quality they are making now. They've REALLY stepped-up their game. The fitment is superb with my high-quality Rainier Arms uppers. There's zero play or wiggle. Their machining tolerances have gotten WAY better than they were back in the day. Because of that, I've been considering one of these AR9's.