Gentlemen, I'm one of those folks that exist in the 20th century. I own no digital camera, barely able to use this here computer and still have not figured out how to use my vcr. And as far as my truck radio is concerned its still set on the same station as when I bought it. When I bought the model 15 right below it was a model 10 with 3" bbl. Could have bought both but the wife was with me rolling her eyes. Decided not to push my luck. The 15 has nicks on the bbl below where the crown starts and some on the cylinder. Those are going to take a little more work to clear them up. Frank