The TTI Ultimate Fiber Optic Sights for GLOCKA(R) were designed to the specifications of Taran Butler and Robert Vogel for the optimum sight picture and brightest fiber optic front sight possible. The fiber optic dot has been moved up to the very top of the front sight so the shooter doesn't get confused with shooting off the top of the dot or a big, thick blade sitting above it, which can cause the shooter to shoot either too high or too low. The fiber optic bar is NOT partially embedded into the floor of the sight, which means more light reaches a greater portion of the circumference of the rod. The shiny stainless steel screw reflects even more light right to the middle of t Mfg: Taran Tactical Innovations