Elected to re-cut the factory dovetail to 60 degrees. It was an easy decision to make since I already had a cutter.
Set it on parallels and protected the sides with some heavy paper.
Cut it a couple thousandths deeper than I really wanted to, but once it's blued up and there's a sight installed, it really won't be noticeable.
A couple passes with a triangular file and it's good to go.
Next up, I'll start the body of the sight.