Hey Gang,... those of you still following the saga of the pitted barrel... must be riveted by now!. Another tech at S&W looked at the images and also said, it was lead build up that often happens on ported barrels. Recommended "Kleenbore Lead Away:", to remove. Maybe someone has used it,... review time! Plus, and this is the kicker,... there is a recall on this gun. It falls in the date range during covid,(mid year of 2020) of a bad batch of hammers with cracks that could release from the sear and go into full auto mode, sometimes without touching the trigger.... so its gotta go in anyway. Thanks to all that commented, and Ill post on progress at a future date....