I have been building and shooting AR's built on PWA (Pac West Arms) lowers for over 10 years now.
All have have had good, clean forgings, the machine work has been excellent, and the finish has always been a nice uniform true black color. All the other manufacturers parts have fit perfectly except one Olympic Arms flat-top upper many years ago. It's takedown lug was slightly wider than the opening in the PWA lower. I just simply machined a few thousandths off each side of the takedown lug and the fit was then perfect.
By the way, PWA NEVER built any complete rifles. As late as 1995 they sold kits that never had barrels as part of the kit. It was some sort of a tax thing. It's too bad they are no longer in business. I thinks the overall quality of their lowers was superior to Colt , Bushmaster, and other I have seen.