The Meprolight Tru-Dot R4E Orange/Orange Fixed Night Sight Set is a Special Forces-developed tritium sight system for Glock standard frame pistols (17, 17L, 19, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34, 35, 37, 38, 39, and 45) featuring five sight alignment elements — three vertical features and two horizontal white alignment lines — that produce a unique crosshair-style reticle sight picture for dramatically faster and more precise target acquisition than a traditional 3-dot system. Both front and rear sights feature vivid orange tritium vials with white alignment lines for high-contrast aiming day or night, while the white vertical line on the front sight provides an additional reference point that is clearly visible in daylight. Drop-proof, shockproof, maintenance-free, and backed by Meprolight's 12-year tritium illumination guarantee, these sights install directly into the factory dovetail with no slide modifications required. Meprolight USA Tru-Dot R4E Orange/Orange 1 Front 3 Rear Tritium White Alignment Line Glock Standard Frame Fixed Sights 122243901