David, Attached are a couple butt extension my brother crafted. Watching the process, he always has his moisture meter out checking the material. Depending on whether a permanent extension or removeable for further change in LOP or Pitch, it can be epoxied (not glue) or only screwed in. I've seen and used both and either proceedure results in a functional and solid buttplate. A piece of wood the size of an extension wouldn't have enough length in grain structure to twist and turn like a waterlogged rifle stock. Change in humidity might be enough to swell the wood cells at the juncture. Below: The radiused extension ( on a LC grade #1 20ga.)is partially complete with additional work being a scrimshaw grouse etching in the bone inlays, final carving of the ebony inlays, stock bent to fit, checkering, and hand rubbed finish. Standard extension is on a LC Ideal, not complete.
Good luck. Lots of great guns can be put functionally and aesthetically back in the game. Randy
