Trijicon HD Tritium Sight Set Features The Trijicon HD Tritium Sight Set uses self-luminous three-dot tritium lamps paired with a photoluminescent paint outline to make the front sight twice as bright and twice as quick to find as a standard tritium dot alone. That extra visibility matters most in the split second a defensive encounter unfolds when the shooter needs the front sight to jump into view without hunting for it. The yellow outline on the front sight contrasts sharply against the black steel frame while the black outline on the rear keeps the sight picture clean and uncluttered. Together the two sights give a fast repeatable index whether the shooting is done in daylight low light or full darkness. The rear sight s U notch is angled and serrated specifically to cut down glare that would otherwise wash out the sight picture under harsh light. That serration also pulls the eye naturally toward the front sight reinforcing the sight alignment habits that build accuracy over time. Engineered to fit Glock s large frame pistols including the 20 21 29 30 and 41 models and their S and SF variants this set bolts in as a direct factory replacement with no slide modification required. The Trijicon HD Tritium Sight Set brings a proven night sight solution to any Glock large frame pistol for sale at GrabAGun. Trijicon HD Tritium Sight Set Specifications Manufacturer: Trijicon Model: HD Tritium Sight Set Type: Night Sight Compatible Hosts: Glock 20 21 29 30 41 (including S and SF variants) Frame Material: Steel Frame Color: Black Front Sight: Green Tritium with Yellow Outline Rear Sight: Green Tritium with Black Outline U Notch Weight: 0.42 oz Available At: GrabAGun