SureFire Dual Fuel Scout Light Pro Weapon Light (Black)

BH #SUM640DFBPRO • MFR #M640DF-BK-PRO
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SureFire Dual Fuel Scout Light Pro Weapon Light (Black)
Key Features
  • 1500 Lumens
  • Mounts on Picatinny or M-LOK Rails
  • Swivels for Optimal Positioning
  • Uses One 18650 or Two CR123A Batteries
The black SureFire Dual Fuel Scout Light Pro Weapon Light can be mounted on a Picatinny or M-LOK rail and swivels as needed—toward the rifle for a narrower profile or away from it to make room for other gear. The Dual Fuel Scout Light Pro delivers 1500 lumens when using the included 18650 rechargeable battery or 1200 lumens when using two CR123As. Runtime is 1.5 and 1.25 hours, respectively. The Total Internal Reflection lens for a bright beam with a long throw and ample surround light. The light is controlled on a momentary or constant-on basis with a push-button tailcap switch, shrouded to guard against accidental activation. Its hard-anodized aluminum housing is O-ring sealed against the elements.
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SureFire M640 Overview

From Manufacturer

The black SureFire Dual Fuel Scout Light Pro Weapon Light can be mounted on a Picatinny or M-LOK rail and swivels as needed—toward the rifle for a narrower profile or away from it to make room for other gear. The Dual Fuel Scout Light Pro delivers 1500 lumens when using the included 18650 rechargeable battery or 1200 lumens when using two CR123As. Runtime is 1.5 and 1.25 hours, respectively. The Total Internal Reflection lens for a bright beam with a long throw and ample surround light. The light is controlled on a momentary or constant-on basis with a push-button tailcap switch, shrouded to guard against accidental activation. Its hard-anodized aluminum housing is O-ring sealed against the elements.

Performance
  • 1500-lumen output with included rechargeable 18650 battery, 1200 lumens with two CR123As
  • Total Internal Reflection (TIR) lens for bright beam with ample surround light
Switching
  • Type: push button
  • Location: tail cap
  • Momentary and constant-on modes
  • Shrouded tail cap helps prevent accidental activation
Low-Profile Mount
  • Mounts on Picatinny top rails or forend M-LOK rails
  • Pivots as needed: away from weapon to accommodate other gear, closer to weapon for smoother profile with less likelihood of snagging on brush
  • Includes Picatinny and M-LOK cleats
Construction Details
  • Lightweight aluminum housing
  • Scratch- and corrosion-resistant Type III hard-anodized finish
  • O-ring sealed for weather resistance
  • Impact-resistant tempered window
UPC: 084871329262

SureFire M640 Specs

Flashlight
Illumination Source
1x White LED
Lumen Output
1500 Lumens (with 18650 Battery)
1200 Lumens (with CR123A Batteries)
Features
No
Environmental
Impact Resistance
Not Specified by Manufacturer
Environmental Resistance
Water-Resistant (IPX7)
General
Mounting
Picatinny, M-LOK
Battery
1x 18650 Lithium-Ion
 • 1.5-Hour Runtime
Materials
Aluminum
Dimensions
Head Diameter: 1.1" / 2.79 cm
Length: 5.6" / 14.22 cm
Weight
5.5 oz / 155.9 g
Packaging Info
Package Weight
0.69 lb
Box Dimensions (LxWxH)
10 x 5.7 x 1.9"

SureFire M640 Reviews

One of the best

By Matthew
Rated 5 out of 5
Date: 2025-06-22

Very well made, it’s a Surefire.  Endless accessories.  Wide spill. For close work, out to 50, 60 yards. Works well indoors. If you need more throw, go with the turbo version. Will accept other heads like HRT, Modlite, Malkoff. Very good mount for either picatinny or m-lock rails. Can use 18650 or cr123s

Great light but not "new"

By Michael
Rated 3 out of 5
Date: 2022-01-30

Light is awesome and at an excellent price but was clearly previously opened/owned as the box was destroyed when I got it

See any errors on this page?

Can Surefire tape switch be used with this light ...

Can Surefire tape switch be used with this light without an adapter??
Asked by: George
The SureFire Dual Fuel Scout Light Pro Weapon Light (Black) will need this SureFire DS00 Waterproof Switch Assembly for Scout Light Weapon Lights (Tan) in order to be used with the tape switch: https://bhpho.to/2F1Qw4m
Answered by: Dan W
Date published: 2023-11-10
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