This stock is believed to be factory but has no markings. I doesn't look like it's ever been mounted on a gun. There is a hole for a sling swivel but one is not installed. It includes the attaching bolt, recoil pad and screws. I bought it to replace a pistol grip but sold the gun before it was installed.
It looks like this, http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=174952