I have the EasyHit Hunting kind. I think they make them with different mounting types & I went with the stick on kind after loosing a magnetic kind last year. It is a green sight, but if I were to do it over, I think I would get the red.
I really like this sight as it forces me to keep my cheek down on the stock as I have a tendency to pick my head up when looking at the bird. It has a tube that extends about two inches down the rib so that you can’t see the fiber optic sight unless you have the proper eye alignment.
You can get it at most major sporting/shooting stores. I got mine at Sportsman's or Joe's I think.
http://www.easyhit.com/?page=10
Good luck
Jim