I just got done cleaning a very old pump shotgun, and while I don't know the make of it, I have never had such a filthy gun in my hands. The outside only had minor surface rust, but the inside has a thick black sludge mixed with dust. Kerosene, PB blaster, nothing took it off. I had to take each part to a wire wheel to finally get it off. That's a horrible gun mistake for using WD40 as a lubricant for 40 years and never cleaning it. Yuck.
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