IF it had the original fixed mag and wasn’t modified, $300-$350.
I bought a Norinco cheap a few years ago that had a broken Tapco mag and paid $60 for a replacement fixed mag.
If that stock has been modified, I wouldn’t offer over $200. Replacement stocks aren’t cheap anymore.
Your buddy is either a fool or a con artist if he’s asking $800 for a run of the mill Norinco.
Don’t confuse Norincos with Russian SKSs when you’re talking resale.
If you get it for a fair price, I got my unissued NOS fixed mag off eBay from a guy in Russia for $60 shipped. Took forever to get here but most rusty mags were $40 and used good condition mags were $50. TAPCO is out of business so good luck finding any more of those, and the Asian metal aftermarket ones like the John Masens are junk.