Buying a SKS tomorrow, any advice?

A long long time ago my first military style rifle was a SKS, it was fun to shoot, in a monte carlo stock...it was cheapo and I got rid of it long ago, Ive become a very serious WWII german rifle collector so Im asking for some advice for tomorrow Im going to buy a Norinco sks off of a guy I bought a german pistol from two years ago (for $200)

Only thing I can remember about this particular rifle is that it is a Norinco for sure, he took the bayonet off of it, and it was in unbelievable condition, Ive glanced over many many sks rifles in the past several years and comparatively this one is superb, the wood is light and crisp, with sharp edges....hell I almost bought it then just on condition alone! it seemed brand new

now what advice to look for important points of manufacture, variations? serial numbers, etc, but most importantly, can I find and reinstall the bayonet somewhere, is it legal to do so? are there any current laws or regulations that govern these at all, or did it all go away with the ban expiring...i live in PA...what if any parts should be numbered to match??

I know its vague but thought someone could give me a few pointers before tomorrow....then I can post pics of it in detail, Im getting it regardless, because it is cheap, and as I recall fun to shoot, and perhaps a little of the so called "panic" thats going on rubbing off on me LOL! Every single gun store around me is sold out of military rifles! it is unbelievable!

thanks