Never had any on mine, but, it doesn't go in the field and has only been sprinkled on a few times. I rarely even wipe it down after shooting. Usually have it out at the range 3 or 4 days a month. 6yrs old now. About 4000 rounds through the original .223 barrel. Another 1000 through the .308 barrel (stainless from a 12BVSS).
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