I have one of the mil-spec RE's from PK Firearms. I also have mil-spec RE's from LMT, VLTOR and CMT. My unscientific analysis (based largely on "feel") is that the RE from PK Firearms is much more like the CMT one than either of the others. Still, it's a nice RE and has worked just fine.
Hope that helps.
I agree that this is an interesting thread and it's always great to learn these sort of little details. :)
Derek

