The obvious answer would seem to be taking a Savage 110 (or whatever) stock, drilling a big hole through it at a slight angle, cutting it at a couple of different angles to split it into two parts, then joining the two parts together with a large bolt when needed. Or cutting it into pieces and then mounting metal brackets to the sides so they can be joined together again. If you want to keep things cheap, not waste too much time, and be untraceable, the best bet is often to be crude.
https://imgur.com/PjSZcAh