From a months exposure I'd agree with the gunsmith recommendation. I got one of my rifles wet for 1 or 2 days and it had a bit of rust on the bolt, the barrel was fine. I had it in my truck inside the canopy, but I hadn't noticed the front slider of it was opened, and some rain got in through there while I was driving. I tried a product called Evapo-Rust that I got at Lee Valley Tools (I've also since seen it at Canadian Tire in the auto body repair section). The stuff worked very well, and took aff the small amount of rust without any ill effects to the remaining metal, the drawback is it also removes bluing (which technically is a form of rust)
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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