Technically, the receivers aren't crap dimensionally. They did not heat-treat the receivers at all, so the pin holes elongate and the ejector gets peened. You can fix this by heat-treating these areas yourself, or have a competent AK smith do this. The price you paid is about on-par with what they bring. There was one at the Memphis, TN show this weekend that the dealer had $595 stuck on (I'm sure $500-$525 would have bought it).
I've had a couple B-West MAK-90's (actually BWK-92 was their model number) that were nice. I've had 1 AKS built on their "made in Arizona" receiver and the barrel was improperly head-spaced - to the tune of about 1/4" too much headspace. This was many moons ago, back in my college days. I had the guy I bought it from set the barrel back, but I was scared of it and traded it off for a Norinco M-14.