Theres that whole 922r compliance, pre ban/post ban, and in cases other than Chinese, C&R status, not to mention AWB features, etc.
Its a big pile of Massachusetts crap with some laws still floating around out there about post ban imported Chinese rifles thrown in and I just don't want anyone who may be concerned with the laws to get in a bind.
sksboards.com has all the info on US compliance for SKS rifles under the legal issues section, but here is a link for what folks should know.
http://www.victorinc.com/SKS-FAQ.html
I'm not trying to scare folks, but this is if you are concerned about the laws regarding SKS rifles.