Stay on Target with XS Sights XS R3D Tritium Night Sights feature a traditional 3-dot tritium, notch and post sight picture. The rear is blacked out to increase contrast against the front sight. The front sight is available in orange or green and is equipped with our Ember Glow Dot Technology. Ember absorbs ambient light and glows in low light. The front tritium lamp charges the Ember dot making the front sight glow brighter than the rear, keeping focus down range. R3D sights are the brightest options for fast and accurate shooting in bright and low light. Item Specifications and Features: XS Sights GL-R021P-6N Tritium Powered Front & Rear Sight High-Contrast Orange Front Sight Anti-Reflective Rear Tritium Lens CNC Steel 10 Year Warranty - No Questions Asked Night Sight Warranty Suppressor Height Fits standard holster options Fits: for Glock 17,19,22-24,26,27,31-36,38