I talked to a fellow at a gun show last month who built a PSA 308 and he had a LOT of problems running into road-blocks to finish it. It seems you have to use proprietary PSA parts for this and that.
ALL of the 308 AR configurations require some proprietary parts; PSA is no different and no harder to put together, if you pay attention to what is needed.
I like the PSA because they have the lightest receivers, and are closest to AR15 pattern.