For years I had a red dot scope mounted on a saddle on my 870. Recently decided to go with the FF 2. I mounted it in the saddle but decided I wanted a cleaner profile and a lower silhouette so I took the gun to the local gunsmith and he drilled and tapped it to receive a short rail upon which the FF sets. Its about 1/2 inch lower than the saddle, eliminates a small amount of weight, looks great and when I mount the gun plus the sighting line is much more comfortable.