*New* Surefire X300U-B 1,000 Lumens LED Weapons Mounted Light X300 Ultra

*New* Surefire X300U-B 1,000 Lumens LED Weapons Mounted Light X300 Ultra


(20 customer reviews)

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Big Tex Outdoors



Checkout our X300U A vs B COMPARISON ARTICLE

Read more about this light on RECOIL MAGAZINE

Surefire X300U-B Ultra LED 1,000 Lumen Weapon Light Product Info

Both the black & Tan models are in stock and ready to ship!

This brand new and updated powerful and versatile X300 Ultra LED 1,000 Lumen Weapon Light features a high-performance LED that generates 1,000 lumens of stunning white light focused by a Total Internal Reflection (TIR) lens to produce a tight beam with extended reach and significant surround light for peripheral vision.
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.

The virtually indestructible and highly efficient LED on this Tactical Weapon Light from Sure Fire generates tactical-level light-more than enough to overwhelm an aggressor’s dark-adapted vision-for 1.5 hours per set of batteries. The high-strength aerospace aluminum body on the Sure-Fire 1,000 Lumens X300U-B Weapon Light is Mil-Spec hard anodized for superior toughness and is O-ring and gasket sealed to make it weatherproof. 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.
Activating the X300U-B 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.

Optional DG grip switches are available for use with a pistol, and an XT07 tape switch permits the SureFire X300 Ultra Gun Light to be activated when attached to a long gun without altering your grip on your weapon.

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.

Specifications for Sure Fire LED X300 Ultra Light – 1,000 Lumens:

Max Output White Light: 1,000 lumens
Length: 3.60 inches
Bezel Diameter: 1.13 inches
Candela: 11,300
Batteries: 2 123A (included)
FITS: Handguns and long guns with Picatinny or Universal rails.

Features of Sure Fire High Output 1,000 Lumen X300 Ultra LED Weapon-Mounted Flashlight:

  • Virtually indestructible LED regulated to maximize output and runtime
  • Tactical-level output with TIR lens 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
  • Accepts optional pistol grip and long gun forend switches
  • Weatherproof-O-ring and gasket sealed
  • Construction-High-strength aerospace aluminum with Mil-Spec anodizing; impact-resistant polymer; coated tempered window
  • Includes high-energy 123A batteries with 10-year shelf life

Package Contents:

  • SureFire X300U-B LED 1,000 Lumen Weapon Light
  • (2) Surefire CR123A batteries




Additional information

Weight 6.3845871185043 oz
Dimensions 8 × 4 × 2 in


Add PHLster ARC Switches

No, Add PHLster ARC Switches

20 reviews for *New* Surefire X300U-B 1,000 Lumens LED Weapons Mounted Light X300 Ultra

  1. Ryan

    It’s perfect for my carry gun. I carry a sig p226 tacops in appendix. I originally thought that it would be to long but is barely longer then the gun it’s mounted on. 10/10 would recommend also it’s bright AF

  2. illloominated (verified owner)

    Awesome pistol light for my Glock 17, and Big Tex Outdoors has THE BEST PRICE hands down. i actually ordered the wrong version of this light on accident, i emailed them and had a response and my mistake was fixed all within 5 minutes! it was shipped fast and needless to say im very happy with my light and the service at Big Tex Outdoors. i definitely recommend!

  3. David (verified owner)

    I’ve been carrying daily with a 1000lm x300 for a little under a year now and have 2 others on training guns. Multiple classes, ~4k rounds on my main EDC light, ~2k rounds on each of the other lights, a few hits taken to the light body from UTM rounds, and a handful of impacts later (both from drops and from using the light as a barrier support) and the x300’s are still going strong. Battery life is what you’d expect from a Surefire WML, great hot spot, great flood, really rugged electronics, and best of all – same holster fit & switching as the previous 600lm models. And as with anything ordered from Big Tex – shipping was extremely fast, pricing was great, and customer service (should you need it) is top notch.

  4. Justin (verified owner)

    I’ve got 2 of these from Big Tex now, I run one on my G19 and the other on my G34. Best lights out there. Shipping was fast as usual.

  5. chrisj4040 (verified owner)

    So I tried the Surefire X300u-a first and thought it was great! Super bright, lightweight, and good battery life! The downside is the fit. Fits fine on my G19, rattles on my Kimber Warrior SOC and STI Stacatto-C, and won’t fit on my Stacatto-P at all! Cue the X300u-b! Not as fast to mount but fits all of my railed handguns perfectly with just a twist of the thumb screw. I’m way happier with the “b” than the “a”!
    P.S. Not knocking the X300u-a in any way as it really is a great light I just wanted more flexibility across my platforms.

  6. Dan w (verified owner)

    Extraordinary customer service and fast shipping. Light fits my handgun perfectly and is SureFire dependable. Price was hard to beat with the 1k lumen model as well.

  7. Rufus Fields (verified owner)

    Perfect light perfect fit for my Glock 17 both models fit great just hand tighten the B version if using on a polymer frame great price and great shipping from bigtrxoutdoors.

  8. thedizzle27t (verified owner)

    one of the best weapon lights on the market today, this thing is bright if you can’t see with this thing you need to take your behind to the eye doctor! don’t waste your hard earned money on o light junk that a lot of these youtube/instagram “influencers” advertise to their audiences, plus ordering from bigtex is a bonus in this whole thing they have great shipping and it’s quick

  9. jicvideo7 (verified owner)

    This is my second x300u. I have one on my carry. gun and a second on my Stribog SP9A1. Solid WML, built like a tank.
    Altough I’ve got to admit that for certain applications I prefer Streamlight because of the switches.
    AWESOME service and price by Big Tex. My order was processed and shipped on the same day.
    Super happy.

  10. roots4757 (verified owner)

    Awesome light!! Really bright and built solid. I purchased the x300u-b model for both my sig p226 mk25 and p226r. No problems with fitment on both models. Thank you Bigtext Outdoors for the awesome customer service, best price and very fast shipping. Looking forward to doing business with you folks again.

  11. scott.a.armstrong8 (verified owner)

    This light is awesome, it simply is fantastic. It throws an extremely smooth cone of light that will illuminate enough of your surroundings so that you can have great situational awareness of what is going on in the periphery of the beam. Construction is bombproof and function is intuitive and dummy-proof. Truly nothing to complain about, its an X300U-b after all, they just work. Plus, I’m using mine on a polymer-framed handgun and am have no issues at all with the reliability of the weapon or the light. A Surefire is a surefire though, I’m posting this review in the hopes of helping someone else to decide to give Big Tex Outdoors their business. These guys process and ship orders so fast its wild, even in the middle of COVID-19 they are mailing orders same-day, or next-day. Better prices, far better deals/rewards program, better shipping, better customer service. I’m looking forward to shopping here again!

  12. julien.gutierrez (verified owner)

    Upgraded over my Olight and its a night and day difference (no pun intended). Great price and really quick shipping as always from Big Tex!

  13. T (verified owner)

    Great performing light, no battery drain when stored, very tough. Sits flush with a G34. Farther reach than an M600DF. Fast and accurate shipping as always.

  14. Jonathan Rice (verified owner)

    Been using this light on my duty weapon. Have had no issues. Only change I would make is the sensitivity turning the light on. After wearing it in you get used to it, but it’s alittle stiff out of the box.

  15. ironville16 (verified owner)

    Awesome light, I’ve had this on my Glock for over 8 months and I wouldn’t use anything else, the Lumen/Candela output are both amazing and the X300U is the gold standard in handgun WMLs. a little on the speedy side but you get what you pay for and I want the best when it comes to a tool that might save my or a loved ones life. also the turn around time and shipping was really fast!

  16. brian.windsor91 (verified owner)

    Simply put, The X300 is the best light on the market.
    I have been switching all my pistol lights from inforce to sure fire.

  17. leeclinton.stjohn (verified owner)

    These are really great lights. I have this and the TLR-1 HL and the clarify in the glass of the Surefire is very noticeable. The switches are a little stiff and I hope they will loosen up with use.

  18. mac.mosher (verified owner)

    Big Tex coming through with the goods! X300u’s the best on the market… For now…

  19. paul.nouhan (verified owner)

    Outstanding light! Quality that you expect from Surefire. Has great throw and enough power to PID at all pistol ranges. BigTex has great customer service and fast shipping.

  20. jicvideo7 (verified owner)

    Awesome light and unbeatable price at big tex. I currently have it setup on a g45 as an edc after switching around other brand wml’s and no other brand compares to this. big tex part request sevice for the x300 is also a huge plus. will probably buy a few more.

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