Here I'm cutting the muzzle back 3/32", crowning, facing, and chamfering. Then it's on to the barrel vise. I had to stop and make a different vise insert, with a tapered hole, and modify my previous vise insert by milling 1 1/4" flats on the sides to fit the receiver. I put a 'notch' on the Nambu receiver to facilitate alignment. Finally, looking at the mounted barrel.
Still mulling over milling 'flutes' on the sides of the rear sight base. Front sight base has to be milled down .050" for the front sight blade, and a dovetail cut.
