SureFire's M312C Scout Weaponlight is ultra compact, versatile and easy to use. This package comes with a DS07 tail switch assemblies to make activation instant by simply squeezing and releasing to activate/deactivate the light. The M312C weapon light uses SureFire's own TIR lens to produce a powerful, focused beam of 500 lumens with an illumination distance of 175 meters. In addition, the M312C can be attached to any weapon platform that uses an MIL-STD 1913 Picatinny Rail with a low-profile RM45 mount. This mount positions the light in an offset position to decrease the weapon's profile and decreases the chances of snagging. Features of the SureFire M312C Scout Weaponlight 500 lumen output 1 hour runtimes IPX7 waterproofing Low-profile design Uses (1) 123A battery SureFire M312C 500 LU Black Scout Light w/ RM45 Mount & DS07 Switch M312C-BK