Magpul Rail Light Mount (Left Side Mounted) with SureFire 6PX Pro Dual-Output LED Flashlight SureFire 6PX Pro Dual-Output LED Flashlight Provides two light output levels: a brilliant, penetrating, perfectly pre-focused 320-lumen beam, and a 15-lumen low-output setting that lets you greatly extend the runtime per set of batteries, an invaluable option when you find yourself miles from civilization. Includes high-energy 123A batteries with 10-year shelf life The high-strength aerospace aluminum body is smoothly sculpted for a secure grip and is hard anodized to military specifications for extreme resistance to scratches, abrasion, and corrosion. Magpul Rail Light Mount, It positions the weapon light high and cantilevered forward, at the 11 o'clock position, to allow a more forward support hand position, keep the light tucked in close to the bore, and to minimize barrel shadow. A textured thumb ramp is integrated to provide the user an index point, aiding consistent hand placement and light activation.