I am not sure about this, you should check it out before you take my word for it, but I've heard that some of the CAA stuff is made in Israel and would therefore count against you. Probably good to ask the Saiga forum guys. Unless you did already in which case I'll shut up now.
Keep us updated on it, I'm looking to convert soon. I've no real experience with drills, dremels, chisels, threading kits and so forth.
Found something for you:
Didn't wanna bust the bubble, better safe than sorry. I wanted to use that grip as well and I may try and install some other parts so I can get away with it.