Created to address the needs of tactical shooters, the Bright & Tough Night Sight for Glock 20/21/29/30/36/41/S/SF from Trijicon features green tritium lamps with protective and light-shaping sapphire jewels. The lamps do not require batteries to provide illumination for the sight in low-light conditions. The lamps are encapsulated by aluminum cylinders that protect them from abrasions and shock. The metal housing features silicone cushions to offer recoil-resistant performance. This model features an elevated front sight that clears a suppressor.