Anyone have a source for a schematic--or can provide instructions for removing the buttstock?

If it is like the Orion model that I have. Simply remove the recoil pad and take a long standard screwdriver and remove it. It has a bolt that accept a thick tipped std screwdriver. I recommend using some of the low strength on the threads when re-installing as they have a tendency to loosen when shot alot. Once the bolt is removed the stock pulls off easily!