About this item INCREASED HEIGHT: Specically engineered to allow use with a suppressor or as backup iron sights for a slide-mounted red dot sight, such as the Trijicon RMR INSTANTLY VISIBLE SIGHT PICTURE IN NO-LIGHT AND LOW-LIGHT SITUATIONS: Tritium phosphor- lled glass lamp provides battery-free glow, allowing for a visible sight picture in all lighting situation; Green Front lamp/Orange Rear Lamps ENHANCED PROTECTION FROM HEAVY RECOIL AND HARSH CLEANING SOLVENTS: Tritium gas lamps are contained within protective aluminum cylinders and have additional silicone rubber cushioning SAPPHIRE WINDOW: Each Trijicon tritium lamp is capped with a sapphire jewel which helps to evenly distribute the light from the tritium lamp as well as protect it from solvents and puncture FITS GLOCK MODELS: 17, 17L, 19, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34, 35, 37, 38, and 39 › See more product details