The amount of oil needed to protect from rust in a non-hostile environment is almost insignificant. The surface certainly doesn't need to be wet or dripping.
For protecting the inside of a barrel, I would run an oily patch down the bore and then follow it with a very loosely fitting patch to remove any excess oil.
As for lubricating the rest of the gun, it's best to follow the manufacturer's instructions as different guns have different lubrication requirements.
That said, there are some "dry lubricants" like Hornady One Shot that spray on wet and then dry completely, leaving a very light dry film that not only prevents corrosion but also provides lubrication.
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