No dealer or gun shop that that I've ever seen, here or abroad, stores their guns butt up. Maybe some do, but I've never seen one.
The butt end of a gun is heavier and therefore guns began and have been stored with the heavy butt end down since guns were made
because it is the easiest and the safest in regard to falling over...(especially for a gun shop)........but it is not the best for the gun's longevity IMO.....
Gravity rules......
Someone mentioned that the cleaning fluids will merely run down into the forearm instead of the butt stock, not true and that person does not understand gravity if he looks at the angles at which these muzzle down guns sit....!....Take a look at Joe's nice gun rack above for example.........
We've had multiple discussions on other threads since this particular thread was started, about how to remove oil or solvents or whatever from the heads (punky wood) of double gun stocks caused directly by butt down storage......an ounce of prevention is worth a lot if your guns are keepers IMO........