Trijicon Rmr Mount W/ Integrated Bright & Tough Night Sights - Sig Sauer M17/m18 - Military . 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. Specifications for Trijicon Rmr Mount W/ Integrated Bright & Tough Night Sights - Sig Sauer M17/m18 - Military: Manufacturer: Trijicon Red Dot Sights-Footprint: RMR Optic Cut: SIG Sauer P320 Optics Ready Package Contents: Trijicon Rmr Mount W/ Integrated Bright & Tough Night Sights - Sig Sauer M17/m18 - Military