I have a set of Damascus barrels on one of my Parkers with one groove from the forcing cone forward about twelve inches or so. It is a spiral groove that isn't very deep but would take some honing to remove. It would be about one complete spiral in sixty inches maybe. It is not deep enough to compromise the integrity of the barrels but I can see why someone would turn down the gun if it was for sale. I have no clue what caused it.
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