R3D 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 in the front and using the tritium's light to charge the Glow Dot slightly. This slight difference makes the front sight glow more brightly than the two tritium vials in the rear, keeping your focus downrange. Features: Tritium powered front and rear sight High-contrast colored front sight Glow dot absorbs ambient light and glows in low light Rear sight overhang reduces glare Anti-reflective rear tritium lens Rear sight ledge for one-handed slide manipulations Durable CNC machined steel 10 Year Warranty 30 Day Satisfaction Guarantee Fits standard holster options Springfield XD, XD-M (not adjustable rear), XD-S, XD-S MOD.2, XD-E, HellCat, and Hellcat OSP Hellcat OSP model will lower 1/3rd co-wittness with some optics mounts. (Sheild SMSc)