Okie is right. ALL SKSs have chrome lined bore EXCEPT Yugos. Yugos also have a gas valve that no other SKS has that is prone to corrosion. To compound matters, yugo issue ammo is corrosive, the Yugoslavian soldiers that were issued SKSs were ill trained conscripts, and Yugoslavia used their SKS in a war.
It would be hard to go wrong for $100, but do a thorough cleaning, paying special attention to the gas valve, gas block, and gas piston. If it doesn't cycle the first suspect should be the gas valve, gas piston, and gas tube- in that order.
Yugos are generally considered the least desirable variety by collectors when compared to othe SKSs in similar condition. Be prepared for malfunctions. Fortunately those malfunctions are directly related to rifle condition and are exceedingly rare with unissued or excellent condition rifles.
They can have the nicest wood and a new yugo barrel usually outperforms a chrome lined barrel.