Trijicon's 3-Dot Nights Sights for AR15/M16 Rifles deliver five times the better accuracy in low light environments when compared to standard iron sights. They feature tritium lamps that are capped with a sapphire jewel to evenly distribute the light while providing protection from puncture and solvents. These lamps are also encased in aluminum cylinders with silicone rubber cushions to withstand impacts and recoil.