Things I liked:The green dot is the next best thing to open sights. I have never been a fan of scopes, and my rifle did not have open sights. Switching to the green dot sight fit the bill. Much like using open sights, and after a couple of adjustments I was able to achieve one groups at 50ft. Very well pleased. What others should know:This was an easy fit on my Gamo "Varmint Hunter Stalker"