I've attached some photos. This is a 16 ga O frame. Apologize for the quality. The hammer marks are faint and shallow and there is no perceptible bulge. You need to really look hard to see the hammer marks in the pattern. But you can feel them. Barrels are concentric and both barrels swamp in equally. Wall thickness measurements .078-.067 were taken in front of the forcing cone. Thanks for your comments, Garth
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