This would be for a Colt Gold Cup. As I understand it, the RMR can be mounted WITHOUT making new holes in the pistol. That aspect is super-important to me. I'm worthless with bladed/open sights, at least with anything approaching quickness. Given time I can line stuff up but it's not fun. I've used red-dot type sights on a Ruger MKII slab-side and enjoyed it(Aimpoint 3000). A holo type sight on my National Match would make it way more fun to shoot I think(hope). So if anyone has experience with the RMR lemme know, or experience with another holo sight that requires no modification to the pistol please say something.