I'm not sure this stock is a McM, doesn't fit their checkering pattern.
The closest I've found is AHR's fiberglass stock with Traditional Shadowline, which they do inlet for Mausers. Not sure. Doesn't look like a B&C Medalist, doesn't have the aluminum chassis. I sold a Mauser Medalist this past summer.
Check out this link.
https://americanhuntingrifles.com/new-products/DF
