Just a couple of thoughts: I'm no metallurgist, but I don't think those scratches have any practical effect on the safety of the cylinder. I suppose, at some level of pressure, any scratch might compromise the bursting point of the metal, but I think that would be far in excess of your working pressure. That said, it is a new rifle, and the cylinder should have been replaced when you returned it. Their response impresses me as rather poor customer service.
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