Hmm. These guys would disagree.
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the bore is not protected from pittling and corrosion because the oil cannot get to the steel because of the copper "plating"
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A friend of mine is a metalergist, he says that two different metals like copper and barrel steel left unattended, will cause electrolisis and the steel will be the one that suffers causing pitting.
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http://www.thehighroad.org/showthrea...copper+fouling