I have a Kimber Classic with a 22 conversion. I also have bad eye sight. I am thinking of getting a red dot sight for my pistol. Which one do you recomend and will it work equally as well with the .45 and the conversion. Will my Kimber have to be drilled and tapped? And will I have to remove it when I put the conversion back on. Will i have to resight it everytime I change from 22 to 45.