Recipe for wood filler?

[trenchwarfare]

I use white glue. Elmers, Dollar General brand, doesn't matter. Remove the buttplate, lock, or whatever part is removable. "Borrow" some wood shavings/filings, and mix with the glue. Fill in the area missing wood, and let dry. The smoother you apply, the less sanding you have to do. By using wood from the affected gun, the color is an perfect match.