Is a Chinese SKS Carbine treated differently than one from a Yugoslavia, Russia, etc?
Yes and no. Yes, SKS carbines from many (primarily eastern European nations) are imported under “Curio and Relic” rules. And no, Title 18 USC 922(r) still restricts the assembly of those items prohibited under Title 18 USC 925(d)(3). So if your C&R SKS Carbine loses its’ C&R status, it is treated just like a non-C&R Chinese SKS Carbine.