If you were to send them out for refinishing I would hope the person doing the job would put a protective coat on the barrels as Mr Bachelder indicated.
Beyond that, just clean the barrels very well inside and wipe them down inside and out with a protectant such as Ballistol or Rem-Oil or whatever you prefer.
If the gun sits for a long time between use you should simply wipe them down again every couple of months or as needed.
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__________________
"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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