The GLK001014YGZ Night Fision is an exemplary product that leverages an injection molded procedure, combined with a military-grade polymer, resulting in durable tritium outlines. These provide you with unparalleled flexibility and daytime visibility. Besides the tritium vials, which are sourced from Switzerland, the manufacturing and completion of all Night Fision products happen within the USA - offering you a truly local product.This Perfect Dot night sight set presents a square front with green tritium and a yellow outline, as well as a blank u-notch rear. The sight set\'s versatility is showcased by its compatibility with various Glock models including 17/17L/19/22/23/24/25/26/27/28/31/32/33/34/35/37/38/39.