Advanced design"" superior sighting and BattleReady(TM) toughness define Troy Industries' new Di-Optic Aperture (DOA(R)) flip-type sights. Now available with Tritium"" a form of hydrogen that emits its own light source"" ideal for any low-light shooting situation. These sights provide lightning fast target acquisition and are manufactured to exceed military specs. The optically engineered apertures center your eyes instantly and effortlessly providing a clearer target picture than with round apertures. The sights feature two settings"" one for up to 300 meters and a second for up to 550 meters. This versatility makes the DOA ideal for military"" law enforcement and home defense applications. These advanced sights have been extensively field-tested and"" like all Troy Industries products"" are BattleReady. Count on it.