I mounted my Blue C-More Railway sight onto an Allchin mount for my 617 with a 12 MOA dot. Now it's the same set up as my 6 inch. I intend to use the 4 as my primary gun for out upcoming State Championships but will have the 6 inch in reserve.
I also drilled the Miculek grips so that I can adjust the strain screw (an 8 32 set screw) without having to remove the grips.
Both guns are set to 55 ounces of hammer drop and right at 8.5 pounds of DA trigger pull. I've got my DS-10 speed loaders and loading blocks ready with Federal Ammo from the Blue 800 round boxes.