Yep. Humidity and condensation are the culprits. My 870 is kept near a second floor window, but we rarely have much humidity. The temperature defenitely drop at night. A couple of weeks past, though, we had a few really humid days. Just checking the 870, which had been resing on its side, I found rust in two areas' the top of the top and sides of the bead's pedestal and a spot on the inside of the barrel near the muzzle. I think condensation forming on the inner walls of the barrel pooled at the lowest part of that inner wall. I think I will try a gun sock.
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