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Old 06-28-2012, 08:26 PM
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JaPes JaPes is offline
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Get some Hoppes Copper Solvent, run a sopping wet patch down the barrel, and let it sit the requisite 24 hours. Next day, run a patch lightly moistened with the copper solvent. If you see green on the patch and the discoloration is off the barrel, it was copper fouling.

If it is rust, call S&W.
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