SureFires Scout Light Pro series rewrote the rules of long-gun WeaponLight versatility. The M640DFT combines the best attributes of the M640 Scout Light Pro with high-candela performance and dual-fuel capability. The M640DFT delivers the farthest-reaching beam of any SureFire long gun WeaponLight with the longest runtime. These Gun Mounted Flashlights are ideal for long-range target identification. The M640DFT projects a blinding, peak beam intensity of 100,000 candela using the included SF18650B rechargeable lithium-ion battery, and 90,000 candela with two 123A primary batteries as well. The M640DFT offers tremendous versatility by providing ample spill light for situational awareness without sacrificing long-range performance. The Scout Light Pro Low-Profile Mount (LPM) delivers unprecedented versatility, allowing the user to optimize the lights position relative to the rail and other attached firearm accessories. Rugged and reliable, the LPM easily and securely attaches to any MIL-STD-1913 or M-LOK rail. Constructed of lightweight aerospace aluminum, Mil-Spec hard- anodized, and O-ring sealed to keep out the elements, the M640DFT Scout Light Pro is the best-performing, most feature-rich, WeaponLight for its size.