Eezox or similar. It works. I treat my stainless Howas with this and keep up the treatment with use. I'm also diligent about properly drying the rifles after wet use - and they often gets used in drenching rain. I strip it down, dry it in front of the fire or in the sun in summer, and re-apply the Eezox. No rust. I have left my .243 on the bike overnight in the rain (long story) and it was fine.
Comments re Tikka are spot on, they do it too, though not to the same extent. Several stainless brands will rust if not maintained.
There's a really interesting YouTube video testing all the different coatings, you should see untreated stainless steel in the warm salt water spray after 12 hours. Looks like it's been on the bottom of the ocean for 12 years. Cerakote was mint!
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