The SureFire X300U-B Ultra Weapon Light delivers a 1000-lumen, 11,300-candela beam from a compact, bombproof aerospace-aluminium body. The difference from the X300U-A is the mount: the B uses a screw-clamp system for an extra-secure, stable fit on Picatinny rails.
Ambidextrous toggle switches give intuitive momentary and constant-on activation, and the O-ring-sealed body is rated IPX7 for all-weather use.
Finish: Black — also available in Tan.
How It Compares
Prefer SureFire's rapid Rail-Lock attachment? See the X300U-A. For long-throw high candela, look at the X300T Turbo models. Browse all weapon lights and the wider SureFire range, and read our best weapon lights guide.
Ideal For
- Duty and home-defence pistols
- Rifles with a Picatinny rail
- Tactical and professional use
Key Features
- 1000-lumen high-output LED
- Balanced beam — 11,300 candela, ~213m throw
- Screw-clamp mount for a rock-solid Picatinny fit
- Ambidextrous momentary/constant switching
- Aerospace aluminium, O-ring sealed (IPX7)
Technical Specifications
| Output |
1000 lumens |
| Peak Beam Intensity |
11,300 candela |
| Beam Distance |
~213 m |
| Battery |
2 x CR123A lithium |
| Runtime |
~1.25 hours |
| Material |
Aerospace aluminium |
| Finish |
Black |
| Mount |
Screw clamp (Picatinny) |
| Length / Weight |
~3.76 in / ~4.0 oz |
| Water Resistance |
IPX7 |
| MPN / UPC |
X300U-B / 084871324939 |
What's Included
- X300U-B Ultra weapon light
- Mounting hardware
- 2 x CR123A batteries
- User manual
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and SureFire's warranty.
Frequently Asked Questions
X300U-A or X300U-B?
Identical output; the B uses a screw-clamp mount for a very secure fit, while the A uses SureFire's faster Rail-Lock lever. Choose by mounting preference.
Will it fit my pistol or rifle?
It clamps to standard Picatinny/universal accessory rails on most full-size pistols and rifles.
How is it switched?
Ambidextrous toggle levers for momentary and constant-on from either side.
