I just bought a Norinco SKS with three Chinese symbols and a D stamped on the receiver followed by the serial #. It also has a 26 inside a triangle on the receiver, & it takes AK-47 clips. I've been told the "SKS D" is a myth as they wern't marked with a D, and that it is a term used for any SKS that takes AK-47 mags. It has a 20" barrel and a solid blond stock. What gives? I am new to the Hobby so any information would be appreciated!