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SureFire
Overview
The SureFire M640DF Scout Light Pro is a powerful weapon light designed to deliver an impressive 1500 lumens of illumination, making it ideal for low-light conditions. It can be powered by either two CR123A 3V Lithium batteries or a single 18650 3.6V Li-Ion rechargeable battery, providing flexibility depending on your needs. This light mounts securely to M-LOK or Picatinny rail systems, ensuring stability on your firearm. This product is commonly found on builds featuring a mid-length gas system and chambered in 5.56 NATO, making it a popular choice for tactical setups.
SureFire M640DF Scout Light PRO Dual Fuel Weapon Light - 1500 Lumens - Black
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SureFire M640DF Scout Light PRO Dual Fuel Weapon Light - 1500 Lumens - Black is the ninth most added weapon light on GunPartPicker so far in September 2026, behind the Streamlight TLR 9 FLEX Rail Mount Weapon Light With HIgh/Low Switch - 1000 Lumens, with about 2% of all weapon lights added to builds. Up from #12 in July and August. Builds with this weapon light are mostly chambered in 5.56 NATO (91%), mostly on mid-length gas (82%, then carbine-length 12%), and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 8 of the 10 retailers we track have it in stock. It dipped to $264.49 at Ammunition Depot for a stretch in August 2026, well under its usual $332, so sales do come around. Buying today, the lowest price is $319.99 at Optics Planet, above August's low of $264.49, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every light by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Weapon Light Guide →The part most often added in each category by the 70 builds that include this one
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Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
BCM GUNFIGHTER Picatinny Vertical Grip Mod 3 - Black
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
EOTECH 3x30.5mm X 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN
Aggregated and anonymized data showing how builders use this product
Builds in the community that include the SureFire M640DF Scout Light Pro Dual Fuel Weapon Light - 1500 Lumens - Black
| Build | Parts | Total |
|---|---|---|
 | 11 | $4304.24 |
 | 17 | $1477.40 |
 | 24 | $6480.66 |
 | 26 | $4008.87 |
 | 27 | $5284.31 |
 | 21 | $2996.92 |
 | 17 | $4151.96 |
2 global ratings
Top reviews
Surefire M640DF Scout Light Pro dual fuel at 1500 lumens runs on CR123 or rechargeable cells. The dual fuel flexibility is great for varied deployments. T-slot mount keeps it stable. 1500 lumens lights up a 100 yard target easily.
Surefire M640DF Scout Light Pro at 1500 lumens has solid battery life on rechargeable 18650 cells. Dual fuel means CR123A backup is always an option. Mount holds zero through firing. Bright enough for any application I throw at it.
