"The fouling does attract moisture however, which will lead to rust if not cleaned up quick enough."
That's the entire point.
Black powder residue is also hygroscopic, and that causes rusting.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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