SA's, PSA's, and MA's, PMA's.... The P series is in all practicality the same bow as the non P series. As guys above have stated, the only difference is that some of the rough cut work is done on a CNC mill vs. a band saw where the work is held by hand. They still do the final riser shaping and finishing by hand and the limbs are still laid up and tillered by hand. To hear some describe it, BW tosses a chunk of wood into a hopper and some machine magically carves a bow. Others think a CNC makes a bow less "custom". Say that to Norm Johnson, who makes Blacktail bows (arguably the most awesome looking bows around) and I'm sure you'd get a smile.
Wood vs. Phenolic wedges will not tell you either as they will still make you a bow with wooden wedges. The best way to tell if your bow was made pre CNC is to call BW with the serial number and they'll tell you.