I have recently acquired a Colt Combat Commander XSE with the 4.25" slide. I did not like the fixed dot rear sight so I have replaced this with a Fusion Firearms adjustable rear sight. This was a relativley easy procedure (just minor file fitting) since the dovetail were both designed for a standard Novak slide cut. My question how do I detmine (i.e. is there a formula) proper blade height for the new front sight?