True oil on a beech stock. Top stock is a HW99s beech stock.

If there is a butt pad on the stock. Remove it and the end may be unfinished. Try your oil on it but be aware it may go darker due to it being the end grain.

Good thing as no one will see it if you don't like it.
https://www.dropbox.com/s/2zr8t9jdem...90000.jpg?dl=0