I keep a skim of oil on screw choke threads, and the same skim on full length tubes and the bore they go in. I have never has any rust in the bores or on the chokes in more than forty years of using them in many different guns. I leave tubes in some guns and take them out of others, same result, no rust. If I shoot in the rain, I remove the tubes for cleaning of the bores and the tubes. No fuss, no muss.
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