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SureFire X300U-B WeaponLight

SureFire X300U-B WeaponLight

Manufacturer: SureFire
Category: Weapon Lights & Flashlights
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High Output 1,000 lumens
High Runtime 1.25 hours
Batteries Two 123A lithium (incl.)
Switching Ambidextrous push/toggle

Full Specifications

1. General Information

Name	SureFire X300U-B WeaponLight
Manufacturer	SureFire
Country of Origin	United States
Type / Role	Handgun / Long Gun Weapon-Mounted Light
Introduced / Service Entry	Mid-2010s (current generation)
Status	Active / In Production
Unit Cost	$379–$399

2. Performance

Maximum Output (Recharge)	N/A (Primary CR123A)
Maximum Output (Lithium)	1,000 lumens
Peak Beam Intensity	11,300 candela
Operational Range (Throw)	213 meters
Endurance (SF18650B)	N/A
Endurance (2x CR123A)	1.25 hours
Photonic Barrier Pen	High (effective for close-medium tactical use)

3. Dimensions

Length	3.76 in (9.55 cm)
Bezel Diameter	1.125 in (2.9 cm)
Height	~1.3 in (approx., rail mounted)
Maximum Operational Weight	4.1 oz (116 g) with batteries

4. Payload & Armament

Illumination Type	High-Performance White LED
Mounting Footprint	Universal & Picatinny Rails
Rail Hardware Included	T-slot thumbscrew clamp
Primary Lens	Precision TIR Lens
Switches Supported	Ambidextrous / Optional remote (DG/XT)

5. Propulsion (Power Subsystem)

Primary Source	2x CR123A Lithium Batteries
Secondary Source (Dual)	N/A
Thermal Regulation	Yes (integrated)

6. Communication & Control (Activation)

Control Type	Momentary / Constant-On
Circuit Protection	Integrated
Ingress Protection Rating	IPX7 (1m / 30 min)

7. Operational Use

Primary Users	U.S. Law Enforcement, Military, Tactical Operators
Combat Proven	Yes
Notable Deployment	Widespread adoption by federal, state, and local agencies

Our Rating

The overall rating is based on review by our experts

7.3

Accuracy 7 / 10
Performance 8 / 10
Technology 7 / 10
Reliability 7 / 10

PROS

Exceptional 1,000-lumen output with effective 213m throw for threat identification
Extremely durable aerospace aluminum construction with Mil-Spec finish
Secure T-slot thumbscrew mounting system for reliable rail lockup
Ambidextrous switching for intuitive one-finger operation
IPX7 waterproof rating and proven performance in law enforcement/military use

CONS

Higher price point compared to consumer-grade weapon lights
Runtime of 1.25 hours may require battery management in prolonged operations
Fixed high-output mode only (no variable brightness settings)
Battery cost over time with CR123A cells
Slightly heavier than some compact alternatives when mounted on subcompacts

SureFire X300U-B WeaponLight: 1000 Lumen Tactical Illumination

The SureFire X300U-B stands as one of the most widely adopted weapon-mounted lights in the U.S. defense and law enforcement communities. Designed for handguns but versatile enough for long guns, this ultra-high-output LED WeaponLight delivers powerful illumination in high-stakes tactical environments where positive threat identification is critical.

Manufacturer

SureFire, a U.S.-based company headquartered in California, has long been a leader in tactical lighting solutions. The X300U-B continues SureFire’s tradition of producing Mil-Spec durable equipment for demanding operational use.

Overview and Capabilities

The X300U-B produces 1,000 lumens of bright white light, focused through a precision Total Internal Reflection (TIR) lens. This creates a balanced beam with a strong central hotspot for distance and ample spill for peripheral awareness, making it effective for close- to medium-range engagements. Peak beam intensity reaches 11,300 candela, providing a functional throw of approximately 213 meters.

It attaches securely via a T-slot thumbscrew clamp to both Universal and Picatinny rails, ensuring a solid lockup on a wide variety of handguns. Ambidextrous momentary and constant-on switching allows instant activation without altering the shooter’s grip. Optional remote switches (DG and XT series) are available for long-gun configurations. The light is constructed from high-strength aerospace aluminum with a Mil-Spec hard anodized finish, offering excellent resistance to corrosion and impact. It is IPX7 waterproof to 1 meter for 30 minutes.

Performance and Runtime

Powered by two CR123A lithium batteries (included), the X300U-B delivers 1.25 hours of runtime at full output. Its robust thermal regulation and efficient LED maintain performance under sustained use.

Cost/Price

Retail pricing typically ranges from $379 to $399, reflecting its premium build quality and proven reliability in professional applications.

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