I was away from NZ for a decade. I cleaned my barrels to bare metal (Cu and C removed) and saturated them internally and externally with (sticky) chain oil. Stocks were removed. Barreled actions stored horizontally. Conditions were perfect on return. They weren't stored in the greatest of places - under a work bench at to mother's.
Wouldn't really recommend my method though for short to medium term.
For short term storage (weekly range shoot season) I flood mine with Hoppes 9 and store them barrel down. Hoppes is pretty much useless for Cu removal but if left in the barrel for a few days will work. I still have a bottle of the old Hoppes. Latest stuff is synthetic and minus the shite that Kalifornia bans.
For barrel oil otherwise I have been giving Frog Lube a run. Have in the past used a lot of the other snake oils as well.
For good general corrosion protection (not firearms) I like CRC Long Life or CRC Marine.
https://dayattherange.com/?page_id=3667
Inside vehicle doors I like fish oil. IIRC used to be called fisholene.
Tried lanolin years ago but cannot remember what my conclusions were.
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