My son has a .404 Jerry's that was built on a standard 98 Mauser. It is a single shot right now.

When I get back to America, he wants to me to convert it to a magazine feed.

I haven't looked at the gun for a while or did any number crunching, can it even be done? Right now don't have access to the gun, my books or tools?

If it can be done, any suggestion for bottom metal?

Any words of wisdoms or warnings about what to watch for?

Also where is the best place to find brass right now in the US?