XS DXT2 Big Dot Tritium Night Sights offer the best front sight visibility in all lighting conditions. DXT2 Big Dot sights drive focus to the front sight using a high-contrast front and a V-notch rear for an unobstructed view of the front sight. Features: 10 year warranty - no questions asked night sight warranty Tritium powered front and rear sight - glows in low light to aid in sight alignment Fits standard holster options Quality manufacturing