XS Sights GLR012P6N R3D Night Sights fits Glock Black | Green Tritium Orange Outline Front Sight Green Tritium Rear SightR3D Night Sights feature traditional 3 dot tritium, notch and post, sight picture. The tritium front sight comes equipped with our proprietary photoluminescent orange or green Glow Dot, which absorbs ambient light and glows in low light. The 2 dot tritium blacked out rear illuminates, giving proper sight alignment while not outshining the front sight for accurate indexing. Our design increases focus on the front sight by using a brighter tritium vial