I also use a DanishOil finish called 'okeene' by the maker. It is a thin oil that easily penetrates the wood. It is almost impossible to build up a finish with this stuff, instead it builds a finish 'in' the wood.. I apply to a stock heated to uncomfortable with a heat gun. Keep the wood slthered with the finish until the stock cools. The excess should be wiped from the stock with a course cloth, cross grain.. The mauser were originally literally boiled or submerged in hot oil. This soaked the wood with the protective oil. There would as Iowegan said be almost no, or at least very little finish buildup on the surface. Regular linseed oil should not be used on a stock as it almost never dries.. and will become sticky when handled in normal summer temps. TruOil can indeed be used but the surface buildup should be cut back to the woods surface and the stock waxed after the pores are sealed.