XS Sights R3D 2.0, Tritium Night Sight, Fits Glock 17/19/22/23/24/26/27/31/32/33/34/35/36, Orange Front Outline, Green Tritium Front/Rear GL-R201P-6N The second-generation R3D night sights are engineered to give you a brighter" stronger set of sights. Easily install your sights with a set that requires 50% less force for installation. R3D 2.0 sights are built to withstand years of EDC use and abuse. The set drives focus downrange using a serrated blacked-out rear sight and a dual-illuminated tritium photoluminescent front sight. R3D 2.0 sights are the brightest notch and post option for fast and accurate shooting in bright and low light.