The SKS is missing the original stock. 8 digit serial number first 2 number are 18 the serial number ends with an N. It's a norinco poly. The weird things I can't find much on is the dark grey bolt. The 11 on the side of the bolt and The serial number ending with N. It's a milled receiver and milled trigger group. Pinned barrel. It has a triangle stamp that traced to the 416 factory in China. Any help on information about it or what it's worth would be every helpful.