TFB Review: SureFire M640DFT-PRO Weapon Light - Part 2

Patrik O
by Patrik O
TFB Review: SureFire M640DFT-PRO Weapon Light – Part 2

This is the second part of the SureFire M640DFT-PRO weapon light review so if you have not read part 1 click here.

SureFire @ TFB:

Construction/Durability – M640DFT-PRO

The M640DFT-PRO has a hard anodized aluminum body with a tempered window making it very rugged. I’m sure by now if you’ve looked at any of the pictures from this review, you’ve noticed that I’ve painted this particular light. In the six months that I have on this light, I have certainly not been nice to it. Recently, I took it to the tactical games where it incurred quite a bit of where on the body. The front lens of the flashlight does have a few scuffs on it but overall it’s in remarkably good shape.

Yes, SureFire does offer this light in tan but the model I was sent was in black and I wanted to change the color. If there’s one thing people can agree on it’s that SureFire lights are built to last. To this day, the M640DFT-PRO still performs flawlessly, and I have nothing negative to say about its durability.

Mounts – M640DFT-PRO

I’m really happy to see that SureFire put their own mount on this light. The mount is simple and allows you to adjust where the light sets on your rail. It’s a very low-profile mount and does not add a lot of weight to the light which is also nice. I also really appreciate that SureFire includes both an M-LOK and 1913 Picatinny rail mount adapter for this light. It’s nice that you can get the same mounts for the same lights from the same manufacturer and not have to go with a third-party mount. It’s also very easy to mount your light forward on your rail as the mount is located near the back of the light body.

Tailcaps / Switches – M640DFT-PRO

The M640DFT-PRO does come with the Z68 tail cap out of the box, and it performs as expected. The clicker has a positive sound and tactile feedback, so you’ll always know when the light is being turned off or on and this will help you figure out if your battery is dead. SureFire also sent out the DSE cap and the SR07 tape switch for me to use with this light. The DSE includes a system disable feature meaning that if your pressure pad or tape switch fails you, you can quickly engage the button on the back of the DSE to get your light up and running. The DSE also has a port on the back for your tape switch.

The SR07 tape also has a constant on button on the front of it. While I like having the light as low profile as possible, I do think if you were going to run this light on a rifle having these two additional components is pretty mandatory. Of course, this will inflate the price and weight of the overall package. While many companies are now making their own tail caps and switch ports for SureFire-style bodies, SureFire is still the industry standard so it’s nice to have a light that you know you can plug pretty much anyone else’s tape, switches, or tail caps into.

Battery / Runtime – M640DFT-PRO

I touched on this a little bit in part one of the review so I won’t go into full detail here, but the run time and output on the light is pretty exceptional, in my opinion. I know that the light does fall off on its lumen output pretty quickly, but how realistic is it to have your weapon light turned on for more than 20 seconds at a time? I think even being able to sustain over 400 lumens for close to 1:15:00 minutes is pretty impressive. The really impressive feature of this light to me was the overall reach it had with his Candela output. It was pretty easy to see well over 200 yards at night with the M640DFT-PRO.

Image Via

The battery for this weapon light uses SureFire’s dual fuel technology and runs on a proprietary SureFire 18650 battery. Costing only $22 a pop I think these batteries are not too expensive given their performance. The way you charge these batteries is a little bit weird as you use an older style, micro USB cable and plug it into the side of the battery to charge it. I know people say all the time that they hate rechargeable batteries but you can run both rechargeable’s and nonrechargeable’s in this flashlight. Of course, you should expect a slight reduction in performance with the rechargeable batteries.

The Beam – M640DFT-PRO

In part one of this review, there are lots of pictures that can visually demonstrate what this beam does when used at a distance. In my experience, the turbo feature of this flashlight is really impressive and allows you to see whatever you’re aiming at within 200 yards. I liked the beam pattern on this light because it has a super hot, hot spot in the middle with a little bit of spill on the edges of the beam. While using this light to run one of the indoor events at the tactical games, I did not feel like I needed a light with more of a flood-style head.


  • Great beam pattern with serious reach
  • Long Burn time
  • Lightweight


  • Very expensive
  • Requires additional components for true rifle use

Wrap Up – M640DFT-PRO

Check Prices on SureFire M640DFT-PRO Weapon Lights

Coming in at around $400, the M640DFT-PRO is certainly not cheap, and that’s before you add on all of the accessories to help make this light even more usable. Yes, there are certainly more cost-effective options on the market and some that will come with all of your accessories included with the light, but with SureFire you are getting an incredibly tough light with a great warranty and team behind their products. While I don’t like the fact that SureFire did embellish some of the specs of this light, it’s difficult to give them more than a slap on the wrist for this, because all light manufacturers do this. I’m not saying it’s right but it’s unfortunately not out of the norm. In the end, if you’re looking for an incredibly rugged and tough weapon light with some serious reach that already has the industry standard tail cap and switch inputs, then I think this is the light to go with. I have been nothing but pleased with my copy since I received it, and I plan to keep using it for years to come.

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Patrik O
Patrik O

-Former Army Photographer / Videographer -Current Aviation Student -Future in debt due to Firearm collection

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2 of 6 comments
  • Uri Predrag Uri Predrag on Oct 25, 2023

    An interesting flashlight.

  • Ahab Ahab on Oct 25, 2023

    I personally don't care for cells with integrated charging ports. You often lose some capacity for a higher cost and a more convenient, although much slower, charging method.