Surefire X300® B Ultra 600 Lumen LED Handgun or Long Gun WeaponLight X300U-B


(10 customer reviews)

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Big Tex Outdoors


Checkout our X300U A vs B COMPARISON ARTICLE

BRAND NEW 600 Lumen edition

The powerful, virtually indestructible X300 Ultra WeaponLight was primarily designed for handguns but is also excellent for long guns and mounts securely to MIL-STD 1913 rail-equipped rifles via its newly enhanced T-slot mounting system. This top-selling WeaponLight features a high-performance LED that generates 600 lumens of stunning white light that’s focused by a Total Internal Reflection (TIR) lens to produce a high-intensity beam with extended range yet it provides significant surround light for peripheral vision in close quarters. The highly efficient virtually failure-proof LED generates tactical-level light—ideal for close- to long-range target identification—for 1.5 hours per set of batteries. Activating the X300 Ultra is done via intuitive, ambidextrous switches—now wider and shorter for improved ergonomics—at the rear of the body. Simply press the switch on either side for momentary-on activation or flip up or down for constant-on activation.The X300 Ultra can be securely attached to a handgun or a long gun via its new and improved T-slot mounting system. Universal and Picatinny crossbar wedges are included for simple, foolproof installation. Its high-strength aerospace aluminum body—including the mounting system—is Mil-Spec hard anodized for superior toughness and it is O-ring sealed, making it weatherproof.

Max Output — White Light

Tactical Runtime**


Bezel Diameter

Weight w/Batteries


123A  (included)

*Runtime until output drops below 10% of maximum output

FITS: The new T-slot mounting system fits most railed handguns (and rail-equipped long guns) but adapter mounts are available for some non-railed handguns—click here to view them.


High-performance LED is regulated to maximize tactical-level output and runtime per set of batteries
TIR lens creates focused high-intensity beam for close- to longer-range applications
Integral aluminum T-slot mounting system offers rock-solid attachment to railed hand guns and long guns equipped with MIL-STD 1913 rails
Weatherproof—O-ring and gasket sealed
Construction—High-strength aerospace aluminum with Mil-Spec anodizing; coated, tempered window
Accepts optional DG pistol grip and XT remote long gun tape switches
Includes high-energy 123A batteries with 10-year shelf life

Additional information

Weight 6.3845871185043 oz
Dimensions 8 × 6 × 1 in

10 reviews for Surefire X300® B Ultra 600 Lumen LED Handgun or Long Gun WeaponLight X300U-B

  1. Joshua

    I had the best customer service experience with these guys. They took care of me 100% and the product I got was amazing and at the best price.

  2. Nick

    Fast shipping, great price!

  3. JACOB

    I researched the crap out of pistol lights as I’ve not been happy with the Inforce APL, or the Streamlight TLR. This light easily beats them, hands down. It is more expensive, but it’s worth it. Bonus: Big Tex sells this light about $20 cheaper than anywhere else I was able to find!

  4. Joseph

    The light came quickly, and I threw it right on my gun. I love it! Definitely reduces muzzle flip!

  5. Kanin

    Have ordered 2 Surefire X300 UB weapon lights from Big Tex. They have the best price and quick shipping. Will def be shopping here again

  6. Zach

    Awesome shipping times. Super easy shopping. Fantastic prices. What more do you need?

  7. Kassie

    Great experience! Easy and quick shipping and great customer service!

  8. Josh

  9. Ernest

    I was looking for the Surefire X300U to replace my old Inforce APL Gen 1 light with, and happened upon Big Tex Outdoors’ sale for the X300U. I entered the code in and boom, got a sweet deal out of it. Hindsight being 20/20, I guess the sale was to move some inventory to make way for the new 1000 lumen X300U units, which came out only like two weeks or so after I got my 600 lumen version. A few other retailers also jumped in on the deep discount for the 600 lumen version in lieu of the new 1000 lumen versions coming out, but at this point I’ve already had my light for a week or so. Other than that, shipping was quick, packaging was good enough that the light’s packaging did not get damaged in transit.

  10. Scott

    First time shopping with Big Tex Outdoors and was very satisfied. Their notification system for order updates is frequent and informative every step of the way. They certainly do not leave you in the dark. Additionally, shipping cost was by far incredibly reasonable especially considering where the product was coming from. The discount on the light was also very appreciative let alone when I had some questions about how long that would last….I received a prompt reply and all. Would definitely order from these dudes again. Also, received some swag in the package as well. Very nice! In terms of the light, SureFire as a brand speaks for itself. Their products receive hard use from the military and police and are notorious for continuing to work without compromise. I switched from another garbage plastic brand light and have no idea why I never bought once….cried once. And even at that, SureFire is not all that much pricier from the competition. The light itself is very robust, solid, and functions flawlessly. Incredibly bright and for a pistol light, it will serve very very well. In terms of actual light quality, well it has a very bright center mass with little splash. More then enough room to illuminate a back yard area or house hold room. I cannot recommend this light enough.

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