This is a Surefire Weaponlight known as the M300 Scout, model M312C-BK.
The M312 Scout Light(R) is a lightweight" compact Weapon Light featuring a high-output LED that delivers 500 lumens of blinding white light. A proprietary TIR lens shapes the recoil-proof LED's light into a beam with plenty of reach but enough surrounding light to accommodate peripheral vision" making the M312 ideal for close-to longer-range applications. The rugged M312 attaches quickly and securely to any MIL-STD-1913 rail via its integral low-profile RM45 mount" which positions the light in the off-set position between the rails of a MIL-STD-1913 (Picatinny) forend" decreasing overall weapon profile and limiting potential snag factor. The light is activated via a waterproof DS07 switch assembly" which includes a click-on/off pushbutton switch" a system-disable feature" and an ST07 plug-in momentary-on remote switch with seven-inch cable. The integrated pushbutton and remote switch assemblies operate independently" providing switch redundancy. Constructed of lightweight aerospace aluminum" hard anodized with a Mil-Spec finish" and O-ring sealed to keep out the elements" the tough M312 thrives in combat-like conditions and provides a tactical advantage in low-light situations-without any sacrifice in weapon maneuverability.
Features:
Virtually indestructible, high-output LED generates
TIR lens
Powered by a CR123A lithium battery with 10-year shelf life (included)