The Trijicon SRO red-dot sight is changing the game when it comes to slide-mounted reflex sights, thanks to its larger window and enhanced durability. However, getting it onto a handgun slide is critical to take full advantage of the benefits of this unique red-dot sight, and the Trijicon Glock®MOS and Springfield OSP SRO Mounting Kit is a must-have for owners of these popular pistols. Each Trijicon Glock®MOS and Springfield OSP SRO Mounting Kit ships with short mounting screws, as well as the correctly sized Hex key needed for installation. Trijicon warns that the two longer screws included with the RMR will not work on these two handgun slides.