The balance of a gun on its nose would freak me out. Waiting for them to topple. If you use a quality product that seems to "dry" such as G96 and don't lube it like a leaking Drott and I don't see where there should be any concern. There have been guns stored for hundreds of year on their butt that don't exhibit any issues from oil in the stock head. I have shotguns I have owned for over 40 years that were bought new that have zero signs of oil soaking in the stock head and not rust or corrosion whatsoever....
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