Bobby, my experience is the same as yours. I have never seen a firearm rusted by salt water or rain as described here, even from being left a day or two before cleaning.

Maybe climate has something to do with it. My buddy's Browning 5 worked perfectly and the bore was slick after he put in shell and and fired it after six months submerged in six fathoms of salt water.

I never heard of "rainy day" guns until joining this forum.