Night Fision Optics Ready Stealth Square-Notch Tritium Pistol Night Sight Glock 19/45/47/48 Black Front Black Rear w/ COA Optic. Like all night sights Night Fision uses self-illuminating Tritium to get the "always on" glow that makes them so effective. Night Fision sights have 30percent more Tritium than most sights on the market. The Tritium insert isn't surrounded by a painted-on ring but rather one made of a daylight fluorescing material that produces optimum visibility in daylight. Night Fision's Optics Ready Stealth Series (ORS) sights are engineered to offer a lower 1/3 co-witness with your slide mounted red dot sight. As an alternative to repurposing Suppressor Height sights ORS sights are designed from the dovetail up to work as back up sights for red dots obscuring less of the optic window while still allowing three dot sight alignment if needed. Specifications for Night Fision Optics Ready Stealth Square-Notch Tritium Pistol Night Sight w/ COA Optic: Manufacturer: Night Fision Gun Make: Glock Gun Model: Glock 47 Glock 48 Glock 45 Glock 19 Sight Style: Square-Notch Fabric/Material: CNC Machined Steel Gun Type: Pistol Front Blade Height: 0.23 in Rear Blade Height: 0.362 in Illumination Type: Tritium Features of Night Fision Optics Ready Stealth Square-Notch Tritium Pistol Night Sight w/ COA Optic Brightest Tritium sights on the market Domed lens collimates tritium rays for a sharper sight picture Black Nitride coating used to improve wear and corrosion resistance Front rings available in yellow orange or black Compatible with Glock COA Models 19/45/47 Package Contents: Night Fision Optics Ready Stealth Square-Notch Tritium Pistol Night Sight w/ COA Optic Night Fision GLK-001-230-362-ZGZG: Optics Ready Stealth Square-Notch Tritium Pistol Night Sight Glock 19/45/47/48 Black Front Black Rear w/ COA Optic