The PWA recievers I've seen have been very nice. As nice as any of the lowers I've seen.
As far as Gary's comment about ASA being lousy AR builders That is the truth. I would not buy a rifle from them. Their customer service has the rep of being the worst in the business. Now on the other hand their lowers are great. I bought one just because it was the only one I could find at the time. This has the BEST fit of any AR I've owned or handled, including colts, bushmasters, armalites, oly arms, etc.
I just thought I'd pass it along.
Scratch