Albert,
My 'theoretical' explaination is actually what is taught in the Mechanical Engineering courses at the United States Military Academy. I am currently studying Mechanical Engineering, specifically in the area of materials, where we learn all about oxidation and the way metal reacts to heat, moisture, oxygen etc. I agree with you that if you are going to be handling your firearm or fireing the weapon, you will want to use grease or oils. I should have made it more clear that my recommendation was for long term storage (even longer than cosmoline) with minimal handling.
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