When it comes to tritium gun sights, aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold, literally. Our patented, injection molded sleeve design not only holds our tritium vials securely in place, it creates a brighter and more durable ring, we call The Perfect Dot(TM), that provides maximum visibility both day and night. Features: a Brightest Tritium Night Sights on the market a Domed lens collimates tritium rays for a sharper sight picture a CNC Machined out of high quality steel a Black Nitride coating used to improve wear and corrosion resistance a Installation: Gunsmith Recommended a Built in the USA with Swiss Tritium a Fits Glock Optics Ready MOS 17, 19, 22, 23,34, 35, 40, 41, 45