Reflex sights.
I have small reflex (holographic) sights on a number of my guns. I have two from JPoint, and one from Truglo. I also have a slightly larger version from Trijicon and the full sized EoTech.
The little ones are on my target pistols. They are wonderful. One of them is slide mounted on a 1911 .45 and so it takes quite a beating. It has been on the gun for three years and still works fine. Battery life is good
The Truglo has a slightly larger dot and so is not as precise, though it is a whole lot easier to change the battery.
I have a shooting buddy who has the Docter sight on his Kimber 1911. Also works fine.
Pete