The SureFire M640DF Scout Pro Dual Fuel is a rail-mounted weapon light designed for rifles and carbines requiring high-output illumination with flexible power options. This model uses SureFire’s Scout Pro swivel mount, which allows the light body to rotate inboard or outboard to suit different mounting positions and rail geometries. The light head delivers up to 1,500 lumens of white light using the included SF18650B rechargeable lithium-ion battery, or 1,200 lumens when powered by two standard CR123A batteries.

Constructed from hard-anodized aluminum, the M640DF is sealed for weather resistance and uses a high-strength tempered window. The light is activated via a Z68 click-style tailcap, which is compatible with SureFire remote switches. Output is focused through a TIR lens for optimized throw and peripheral illumination in both indoor and outdoor conditions. This configuration includes the SF18650B battery and USB charging cable. No original packaging or accessories included.

Specifications:

• Output (18650): 1,500 lumens

• Output (CR123A): 1,200 lumens

• Battery Type: Dual Fuel (SF18650B or 2× CR123A)

• Runtime: Approx. 1.5 hours (with SF18650B)

• Mount: SureFire Scout Pro integrated swivel mount (includes Picatinny; M-LOK not included)

• Tailcap: Z68 click-style switch

• Material: Aluminum, hard anodized

• Finish: Black

• Bezel Diameter: 1.125 inches

• Length: 5.5 inches

• Weight (with battery): 5.5 oz

• Water Resistance: IPX7