The thought is that this is completely normal for all revolvers which are factory drilled and tapped. It is not flame cutting, simply deposits from combustion gasses reflected from the hole. Many revolvers will show a row of three rings, one from each screw hole. All revolvers will get deposits on the outside of the cylinder, these just have holes that leave a round deposit. Simply clean the gun and accept that guns get dirty when fired!
Last edited by Alk8944; 03-20-2015 at 08:57 PM.
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