SureFire X300U-B Ultra 1000 Lumen Weapon Light

The SureFire X300U-B Ultra 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.

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

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.