SureFire M640DFT Pro Rifle Light, 550 Lumens, White LED, Picatinny Rail Mount, Tan Aluminum

The SureFire M640DFT Pro rifle light is a versatile mounted light designed for shooters who need serious reach on their long gun. Built around SureFire's Scout Light Pro platform, the M640DFT delivers 550 lumens and a peak beam intensity of 71,000 candela — the farthest-reaching beam in SureFire's long-gun weapon light lineup. Whether you're running precision target identification at extended range, navigating low-light hunting scenarios, or setting up for tactical work, this light balances focused throw with enough spill light to maintain situational awareness without compromising performance.

The M640DFT runs on dual-fuel power: the included SF18650B rechargeable lithium-ion battery or two 123A primary batteries, both delivering full output. That flexibility means you can top up at home or rely on common primaries in the field. The light mounts securely to any Picatinny or M-LOK rail via SureFire's Low-Profile Mount (LPM), which lets you dial in the exact position relative to your optics and other accessories—a real advantage on crowded handguards. Tan aluminum construction with Mil-Spec hard-anodize and an O-ring seal keeps everything weatherproof to IPX7 standards, and the tempered window is built to take abuse. Activation is smooth via the ZE68 pushbutton, which gives you momentary or constant-on modes with a protective shroud to prevent accidental activation. Remote tape-switch options are available if you want to move the control point.

This is a serious tool for hunters and shooters who refuse to compromise on long-range beam performance or durability. The M640DFT doesn't chase gimmicks or settle for short-range spilllight sacrifice—it's engineered for the job at hand.

Key Features

• 550 lumens and 71,000 candela peak beam intensity for extreme long-range target identification
• Dual-fuel capability: SF18650B rechargeable or two 123A primary batteries
• Low-Profile Mount (LPM) enables flexible positioning on Picatinny and M-LOK rails
• Lightweight tan aluminum, Mil-Spec hard-anodized finish, O-ring sealed for weather protection
• IPX7 waterproof rating to 1 meter for 30 minutes
• ZE68 momentary/constant-on pushbutton with protective shroud
• Compatible with remote tape-switch accessories for alternative activation

Specifications

Frequently Asked Questions

Will the M640DFT Pro work on my rifle's Picatinny rail?

Yes. The included Low-Profile Mount (LPM) attaches securely to any MIL-STD-1913 (Picatinny) or M-LOK rail. The LPM design also allows you to adjust the light's position to work around your optics and other accessories without interference.

What batteries are included, and how long does it run?

The SF18650B rechargeable lithium-ion battery is included. With the SF18650B, the light delivers 2 hours of runtime at full 550-lumen output. You can also use two 123A primary batteries if you prefer, which also deliver full output and are easy to source in the field.

Is this light waterproof?

The M640DFT meets IPX7 waterproof standards, meaning it's sealed to 1 meter depth for 30 minutes. The O-ring seal and tempered window are built to handle wet conditions, rain, and splashing—not rated for submersion.

Can I add a remote switch to control this light?

Yes. The M640DFT is compatible with a range of SureFire remote tape switches (sold separately) that let you move the activation point away from the light itself for more tactical positioning.