Bright & Tough Front Night Sight w/ Green Lamp - AR15/M16Tritium phosphor filled glass lamp White painted rings around tritium lamps Tritium gas lamps are contained within protective aluminum cylinders and have additional silicone rubber cushioning Trijicon Bright & Tough Night Sights are three dot iron sights that increase night fire shooting accuracy by as much as five times over conventional sights. Equally impressive, they do so with the same speed as instinctive shooting and without the need for