I use Birchwood Casey Tru Oil cut with mineral spirits on anywhere from a 3 or 5 to 1 basis (mineral oil/Tru Oil) rubbed in with Armor All in the palm of the hand. Do 15-20 coats and then rub the sheen off with 0000 steel wool. (The higher the ratio of mineral oil to Tru Oil, the less the shine on the stock.) Disclaimer: I am a complete frigging novice at finishing gun stocks. Get a second opinion.
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Jordan