Unless it is a new piece of wood or you are repairing damage, an M1 doesn't require much more than a few refresher coats of the right oil. You can substitute artist's refined linseed oil since real BLO is not available anymore.
Check this site out. M1 Garand - The greatest single battle implement ever devised. The M1 Garand. Click the 'wood refinishing' link in the menu.
It makes me sad to see a M! all glossied up like a Weatherby.
YHJ
Mine's not quite Weatherby shiny but I'll make sure not to bring it to an Appleseed that you are hosting. I wouldn't want you to be sad. LOL.