Get the gun milled for your specific optic it will be closer to the bore which is better and will prolong the life of the optic as it won't move around as much under recoil which is what eventually kills the optic on the pistol. Also you can still retain the irons on the gun for if/when your optic fails.
Burris, for Burris Fastfire. Don't know if other optics would fit.
I picked up a mount for my Vortex Razor that mounts in the factory SW dovetail the height added is minimal. was under 70 bucks a few months back



























