Trijicon RMR Mount w/ Integrated Bright & Tough Night Sights - SIG Sauer M17/M18 - Military

Tritium phosphor-filled glass lamp provides battery-free glow, allowing for a visible sight picture in all lighting. Each Trijicon tritium lamp is capped with a sapphire jewel that helps evenly distribute the light from the lamp and also acts as an additional layer of protection from puncture and cleaning solvents. White-painted rings around tritium lamps enhance user's ability to see sight picture in bright-light shooting situations. Tritium gas lamps are contained within protective aluminum cylinders and have additional silicone rubber cushioning.