This is a Surefire Weaponlight known as the M600 Scout, model M622U-BK.
The M622U Scout Light generates an impressive 1000 lumens from two 123A batteries. This small" rugged Weapon Light features SureFire's proprietary TIR lens" with a far-reaching" high-intensity beam with ample surround light. The rugged M622U features an American Defense Manufacturing (ADM) AD-SF mount designed for mounting quickly and securely to a weapon rail. The M-AD-SF features the ADM patented QD Auto Lock(TM) Lever system for both in and out of spec rail systems. The light is activated via a 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" with a Mil-Spec Hard Anodized finish" and O-ring sealed to keep out the elements" the tough M622U will endure combat-like conditions without any sacrifice in weapon maneuverability.
Features:
Virtually indestructible, ultra-high-output LED
TIR lens
DS07 waterproof switch assembly
Quick disconnect ADM throw-lever mount