XS Sights R3D 2.0 Tritium Night Sight for Glock 21 Orange

XS Sights’ second-generation R3D 2.0 night sights deliver enhanced brightness and durability. Installation requires 50% less force than the original design, making setup straightforward. Built to handle years of everyday carry and demanding use, these sights feature a serrated blacked-out rear sight paired with a dual-illuminated tritium photoluminescent front sight. The R3D 2.0 design keeps your focus downrange while providing the brightest notch and post configuration available for reliable performance in both bright daylight and low-light shooting conditions.