I have a Colt Combat Commander 1911 .45 ACP that I love to shoot, but my eyes are struggling to focus on the rear sight, front sight, and target at the same time - I can only get one of them clear at a time. I shot a .22 Bushmaster today with a short red dot tube mounted on the barrel (not the slide). I think it's time for me to consider a red dot (I understand a laser is not permitted for competition - I'm thinking of shooting competition with my club). I'd rather not have to drill/tap my gun to fit the scope/sights. Can you recommend a mounting system and red dot for me? And if I have to drill/tap the slide/frame to mount a sight, which one would you recommend? I'm a little concerned about a slide mount given the recoil of the .45. Thanks.