XS DXT2 Standard Dot Night Sights offer superior front sight visibility in all lighting conditions. DXT2 Standard Dot sights drive focus to the front sight using a high-contrast front and a low profile V-notch rear. DXT2 Standard Dot front sights use a patent pending glow dot that absorbs light and glows in low light levels before it is dark enough to see the tritium. The increased surface area of the convex dot increases light absorption" intensifying the charge of the glow properties of the dot. The dot-the "i" sight picture" with a tritium dot in the front sight and a tritium bar in the rear" prevents confusing the front and rear sight in high-stress situations. In most gunfights" the victim and attacker are both moving and the victim's focus is drawn to the threat. The wide field of view increases visibility of the front sight and of the threat downrange. Outside Diameter Standard Dot 0.140"; fits in common holsters. Installation might require filing to fit sight to dovetail" especially with Walther PDP. Do not use sight press/pusher tool. Fits Glock models 17" 19" 22" 23" 24" 26" 27" 31" 32" 33" 34" 35" 36; Taurus G3c" GX4" and new production G3; Walther PDP. Suppressor Height and lower third co-witnesses with Glock factory cut and RMR.