I have a question, How do you do your muzzles? I have a fixture to put my barrels in my lathe and center the muzzle. Once I have it flushed off flat, I cut the front of the rib back a bit, then setup to slowly take the cutter tip across at a shallow angle from outside to bore, then use a ball end mill to start the center. Then I use about 120 grit to take the top of where the inside cut meets the outside to better round and smooth things out. Then go to higher grits. I also have 2 pieces of brass, one with a rounded end and the other cupped. I hold emery grit against those while they are chucked in tail piece and press them to muzzle. Finish with a ball bearing and valve grinding compound on the actual muzzle. Is there a simpler better way. The rib makes it way difficult than if it was just a round piece. Limits your tool approach to piety much dead on from the front.