[tobnpr]

That's certainly the "KISS" principle. I've always been a proponent of the Weaver/picatinny mounting system. With "traditional" ring mounts, you have zero flexibility- can't change ring heights, can't change 1"/30mm... I would never own anything else.

Forgive the question from the learning novice machinist Clark...
If I were going to do what you did, I would have indicated the rail sections in the milling vise (level), and just milled off the tops. Is the dovetail jig required to prevent the rail sections from "slipping" when milling- IOW- pressure from square vise jaws on the edges might not be sufficient?