The XS DXT Big Dot night sight is the ultimate defensive sight set. Suppressor Height Sights for Glock models 17″ 19″ 22″ 23″ 24″ 26″ 27″ 31″ 32″ 33″ 34″ 35″ & 36. Precision machined in Fort Worth, TX, XS Sights feature a Big Dot Tritium front sight and express rear sight with a vertical….