QUOTE (kingarmory.com @ Nov 22 2008, 06:32 PM)

It appears that the gun is made by Izmech, so everything should interchange. I've heard that some of the ex-Combloc countries produce their own versions of the Saiga but several of the parts don't interchange.
Vepr 12's are not made at Izhmash/Ishvesk. they're from Molot.
But currently Izhmash owns most of Molot from a dispute some years ago. Molot couldn't pay up and was forced to sell out.
Vepr 12's are based on the RPK, not the AK. they're considered a more upbeat S12. more popular with the european IPSC crowd than the Saiga 12 is. very high quality, much more so than the Saigas, but you obviously pay more. these puppies run 1095 euros.
as for interchanging parts? no, most do not interchange, not for american guns anyway (not that it matters, Vepr 12s are too "evil" to import). there's talk that the Molot mags fit the Saiga 12 EXP-01 030's magwell, but that Saiga 12 mags for magwell do not fit Molots. i can't tell first hand though.
(pics are not mine)