XS Sight Systems R3D 2.0 sights are the premium solution for a traditional notch and post sighting system. The sights are engineered to provide a brighter, stronger, and easily installable sighting system for increased defensive preparedness. The R3D 2.0 rear is serrated to reduce glare and features tritium lamps to aid in sight alignment in any lighting condition. The 0.170" wide notch rear sight allows for more visibility on either side of the front sight post for faster sight alignment, especially in poor lighting conditions. Like the original R3D sights, the 2.0 family is designed with a ledge to aid in one-handed manipulations. The R3D 2.0 sights use brighter tritium lamps in the rear sight as compared to the original version to ensure that you can see the sights in poor lighting conditions. The black PVC ring surrounding the rear sight lamps help create a more defined edge on the rear sight lamps to improve the sight picture and differentiate the front lamp from the re...