Are there any sources for parts for the FEGs? P9R? FP9? Other models? From what I have researched, your best bet is to get the FP9 vented version which uses the mags of the FN Hi-Power and many of the parts. Does this parts and mags rule apply to the non-vented versions like the P9M, PJK-9HP? Can new sights like Novak's be used on these vented models? Anybody have any thoughts on this?

Try Numrich.

Thanks

FP9 and PJK-9HP take most Browning HP internals and the grips and mags. The sights may not be 100%, though.
If it is a single action 9mm (there were a slew of names and 5 different importers) it is a straight up BHP clone.
The DA versions may take the grips but mags and internals are different.

Went on Numrich site and the lady walked me through finding schematics and part numbers. You're right, those two models do interchange. The schematics are the same as the FN/Browning HP but they do not have the same part numbers. If there is a letter on the end of the part number, that means it cross-references with another pistol. The P9R does not interchange with FNs. That's a shame cause I really like the compact P9RK. BTW, Numrich folks are really helpful and their site is very user friendly