This was my first attempt at crowning a barrel. This was a DW Wraith 10mm with a threaded barrel. Its the hardest material I have ever tried to cut. I practiced on a couple old Kimber barrels that I had in the tool box first. This DW barrel ruined my carbide blade. I wanted a complete flush cut but settled on the profile shown since it was such a pain. Then put an 11° crown on it using the "Military Crown Kit" from Dave Munson.