Great product and east install. - Vortex Razor Reflex Red Dot Sight

I purchased the Vortex Razor Red Dot Reflex Sight to put on my Colt 1991 Officers model .45. I used the Vortex Razor mounting base so the install was simple. I drove out the existing rear sight and slid the Vortex adapter into the existing slot. The base plate attached to the new adapter with two screws that were supplied with the kit. When the screws were tightened the adapter wedges into the slot. I did have to slightly shorten the two screws but I used a file to do this in just a few minutes. Following the instructions the install went quickly. The Vortex Razor worked better than expected. The one button off and on are great features and easy to use. The battery installation was much easier than other brands of sights. I went to the range and adjusted the sights at 15 yards and then moved to 25 yards. The group was 2 inches high at that range. I returned to the range the following day and recheck the zero. The sight was still tight and the groups did not shift. I am very please with the result. The sight seems rugged but only time will tell. Until then I will be smiling when I pick up the 1991.