Hi-Viz N2 Co-Witness Sight, For Glock MOS 9MM/40S&W/357SIG, .430 Height, Green With White Ring Outline Front, Green Tritium Rear GMNG21-2 HIVIZ co-witness sight set is designed to co-witness on Glock MOS models with reflex sight. Sight height is 0.430 above slide. Sights will be visible with reflex sight at or below the reflex reticle for most reflex sights. all Green tritium front and rear sights.