I can not understand why FN did not put emergency or back up sights on that tri rail model. It really makes no sense to me. Honestly that is why I went with the standard model, for those emergency sights alone. Even if I replace the ring sight and put a rail on, I still have my emergency sights if the optic fails. On top of those emergency sights, FN sells a rail that includes a back up sight in the middle of the rail as well. Some may argue that its not necesarry, but it sure is nice to know its there if you ever need it.