Night Fision GLK000001YGX: 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 yellow outline, and fits all Glocks.