Exposing steel to boiling water will not "open up the pores". I am not saying that you won't get good results with your method, but I don't think the boiling water step does what you think it does. Hot water (near boiling) is a pretty good de-greasing agent, so that is probably what you are accomplishing... which you could also do with a bore cleaner, or alcohol, or a variety of solvents.
I personally would not remove the stock from a rifle unless it needed a repair or had a known accuracy problem.
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