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Theodore, more frequent maintenance as far as cleaning and lubing goes a long way toward mitigating rust. I also use these : https://www.amazon.com/Pistol-Storage-bags-Corrosion-Firearm/dp/B00SEMQQPY
Yes, anything polymer obviously won't rust but the slide, Barrel and anything else metal definitely will. If you wipe it down and oil it really well after getting it wet you shouldn't have a problem. Just make sure if it gets wet when you're done wipe it down well, dry it, then oil it and you'll be fine. I have several gun even all metal like my 1911 and Beretta M9A1 that ill shoot in the rain sometimes and just cleaning and oiling after I've seen no rust. All guns have some metal parts to them so any gun can rust without proper care. Hope this helps.