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Ha! Glad you found a solution. I'm puzzled that the Cu++ didn't do better.
If you read the reviews on Midway, one shooter claimed MC-7 pitted his stainless bores. I'm not sure I believe that, but I mention it because it could be the person blaming KG-12 for corrosion got the cause of the problem wrong, too. Experiments are in order.
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KG12 definitely leaves a crystal of some sort behind when it combines with raw metal from what I've observed (if not thoroughly removed). The hard part is figuring out if it's in reaction to the presence of some other kind of lubricant or solvent. Same can be said for many solvents. I too use bore tech for my day to day cleaning needs.
I've had several brand new rifles/barrels arrive over the past couple of years with similar "pit patches" near the muzzle from different manufacturers. I can't rule out that in the case of the rifle I'm working on that it happened while in the possession of my friend, especially since he's hunted with it severe weather environments and has never cleaned it; but it's entirely possible it arrived from the manufacturer that way IMO. It could be reaction to chemicals/gunk left in the bore--my pet theory is that in the production line when the rifling button is pushed/pulled through the barrel debris accumulate and get caught in front and get "plowed over". It may be pure coincidence, but I've seen these pit patches usually within 3 inches or so of the crown/muzzle. I could be off my rocker, too.