I have used two of Bartlein's # 19 contours. They are just a tick beefier as Shortmag described but nothing major where you would have wholesale inletting issues. I recently inquired to Bartlein if I wanted something that was a little heavier than the # 19 but would not present me with a lot of stock altering.... their recommendation was a # 3b for something a little heavier but they did say they could adjust the dimension's on their # 19 to give me the desired result I was looking for. Issue with that would be wait time for a personalized custom contour. I would think a Bartlein # 3 would be close to the #19 if you can't find what you are looking for in a # 19
