Ameriglo Green Tritium U-Notch 2-Dot Black Outlines Rear Sight Only For Glock 42 /43 /43X / 48 .276" Height .165" GL-845R

The AmeriGlo Green Tritium U-Notch Rear Sight is a standalone night sight designed for Glock Slimline models (42, 43, 43X, and 48). This rear sight features a U-notch design, which many shooters find allows for faster front-sight centering compared to a traditional square notch. It contains two self-luminous green tritium lamps, providing a 2-dot reference for low-light alignment. To ensure a clean sight picture—especially when used in conjunction with a red dot optic—the tritium lamps are surrounded by black outlines, which minimize visual "noise" and prevent the dots from distracting the eye during daylight shooting.