What is the value of a Chinese sks assault rifle without a clip?

The SKS isn't an assault rifle, either by the BATFE's definition, or by the actual definition. Value is going to be dependent on exact model - the Chinese made several variations of the SKS. Depnding om condition, with the missing magazine (not clip), and assuming you have the basic Type 56 carbine in good working order, you could expect between $120 - $200 for it.