The PA10 lowers ARE compatible with DPMS uppers.
What they are NOT compatible with is DPMS takedown and pivot pins...the pins in the DPMS 308 kits are too long for the PA10. You will either need the PA10 lower parts kit or a DPMS lower parts kit PLUS the PA10 takedown and pivot pins.
Odd. I did some searching and thought they were Armalite pattern.
PSA uppers are threaded /18 for Armalite pattern 308 barrel nuts (instead of /16 like everyone else's 308 barrel nuts). However, they don't have the funny cut or odd size that precludes them from fitting on DPMS pattern lowers. If you buy a DPMS upper, it will fit on the PSA lower. If you buy a PSA upper it will fit on a DPMS lower. However, if you buy a PSA upper and want to built it up yourself...then you need an Armalite barrel nut...
Confused yet?
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