Corrosion is only one factor. Wood expands or contracts a great deal depending on the moisture content of the wood. Since butt stock wood grain is not linear, Reducing or increasing moisture into the butt stock might result in the wood expanding or contracting in multiple directions.
Since we have knots and lots of other neat patterns we like to see in our gun stocks. The wood can grow or shrink in multiple directions resulting in torquing of the wood. If you have a lead or other metal rod running down he center of the butt stock it will want to hold its shape and since it is stronger than the wood, a torquing effect could take place resulting in stress crack to the butt stock.
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Threaded Mode