For sale is a custom-built underfolder SKS rifle, constructed from a variety of parts and featuring an underfolder AK-47 stock. This rifle is truly one of a kind. $550 OBO.
Any Picatinny buttstock can be attached to that rifle. The Picatinny buttstocks are not for sale.

Here are the terms of the sale: The buyer must present a valid Florida driver's license and a Florida concealed weapon permit. The bill of sale needs to be signed. The buyer must be at least 21 years old.