Take your rifle apart and evaluate it before you delve too deeply into this project.
Regarding the stock, without seeing it, this is merely a wag. It may be 'repairable' or a replacement may be in order. In the past, I have used the WEST Epoxy System to make some very interesting repairs in wood. Musical instruments, guns, boats, and houses. This stuff is typically sold for boat and aircraft building and repair as well as custom tabletops. A quick search with the google will give you much more information.
Good luck.
