XS Sights DXT2 PRO Series Big Dot Night Sights offer the front sight visibility you expect from XS Big Dots with the added corrosion resistance of a Black Nitride finish and the enhanced durability of the tac lamp tritium vial in the Big Dot. DXT2 PRO Series Big Dot sights drive focus to the front sight using an industry-leading large, high-contrast front and a low-profile V-notch rear. DXT2 PRO Series Big Dot front sights use a 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 aluminum-sleeved tac lamp tritium insert improves upon an already tough-as-nails front sight. 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 the threat downrange. Both sights feature a Black Nitride finish for enhanced corrosion resistance and durability. Outside Diameter Big Dot 0.188″; fits in common holsters. Do not use sight press/pusher tool. Fits Glock models 20″ 21″ 41″ 40″ – standard and MOS.