I would go here, its the Saiga forum, the home page for the 7.62x.39 models. They got a couple of good faqs and oknowledgeable folks,
FQ13
My basic understanding is that if it was legally impoted AS an Ak (before 922r) you should be fine. The trouble comes whan you start puting not sporting parts on a sporterized version. Good luck though as this is about the stupidest single gun control law I have ever encountered and thre are a dozen ways to get bitten in the ass.
http://forum.saiga-12.com/index.php?showforum=5
Not stupid and not a law. Last one first - it is an administrative rule that carries the weight of law, but it is something the BATFE made up, not Congress.
Stupid - not really, as it was intentional. Do you think we need 20,000 actual gun laws, plus all of the BATFE rules? Nope,
they need them. Over 100 years ago Oliver Wendell Holmes is reputed to have said something along the lines of an average citizen cannot go through a day without violating some law. Did Capone go to prison for murder, alcohol manufacturing or trafficking, extortion, assault or any of the other violent things he did? Nope, tax evasion.
The "legal" system has been jerry-rigged to make sure that a prosecutor can incarcerate anyone if the gummint so desires. The more complicated, nonsensical or Byzantine the better, because then you have no idea you are violating the law - but they can still get you.
off to adjust the tin foil hat . . .