Any one use these? I am working on a G20L and am needing some sights. I am not sure if I want to use an optic or sights. They will be NS if I use sights. What is the purpose of the ghost ring? Is it a useful feature or just another gimmick? Also thought of using a front fiber optic. Any help or comments would be welcome. Mainly going to be for longer range target and some hunting.