Have a 870 lw. 20 that the magazine tube rusted on a hint of humidity, de- oiled it and did 2 coats of car wax no more rust so did that to all of them. When in rain I make sure to dry them off before they go in the truck then at camp they are dried and heated gently. Never had any problems. These guns we like are some really well made things and we worry about them accordingly.
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