Re: dont know what to do
My first Norinco SKS got dressed in a Combat Exchange (?) Folding stock, detachable 30 rd mag, 4X scope etc.
Sold it to a deputy who wanted a carbine for his patrol car as a supplement to his issued shotgun.
Found out much later that my "improvements" made it illegal!
Look up the 13 (or 14 for European SKS) parts that have to be changed to US made parts in order to change it from the imported condition.