Night Fision utilizes an injection molded process and military-grade polymer with durable polymer tritium outlines to give you flexibility and unrivaled daytime visibility. With the exception of the tritium vials, imported from Switzerland, Night Fision products are crafted end-to-end right here in the USA. This front night sight has a square top, green tritium with a orange outline, and fits all Glocks.When it comes to tritium gun sights, aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold, literally. Our patent-pending 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, that provides maximum visibility both day and night. Features: Perfect Dot night sights with added daytime florescence Brightest tritium night sights on the market CNC machined out of high quality steel Black nitride coating used to improve wear and corrosion resistance Installation - contact professional gunsmith Built-in the USA with Swiss Tritium