SureFire X300 Series B-Mount User Manual

Product Overview

The SureFire X300 Series B-Mount is a high-performance handgun light designed for tactical applications. It features a thumbscrew mount for secure attachment to weapon accessory rails.

Available Models:

• X300T-B
• X300T-B-TN
• X300U-B
• X300U-B-TN

An illustration of the SureFire X300 Series B-Mount handgun light shows its compact form factor and the thumbscrew mount mechanism.

Specifications

All performance claims tested to ANSI/NEMA FL1-2019 Standard.

Battery Information & Warning

⚠️ WARNING

Before replacing batteries, read the enclosed BATTERY INFORMATION/WARNING insert in your original packaging. For additional battery safety, handling, and product information, visit www.surefire.com/batteries.

Use of substandard batteries can cause injury or property damage. Visit www.surefire.com/batterysafety.

Maintenance

Use a clean, dry cloth to wipe off the body and window. Periodically clean and lubricate threads.

Accessories

SureFire offers accessories for most of its illumination tools. For a complete listing, visit www.surefire.com/partsaccessories.

The SureFire No-Hassle Guarantee

SureFire warrants that if a customer purchases one of its products, and it is determined to be defective in material and/or workmanship during the customer's lifetime, SureFire will repair or replace it without hassle.

The warranty does not cover consumables or normal wear-and-tear, such as batteries draining, headbands wearing out, ink cartridges running out, switches wearing out, or damage resulting from abuse, alterations, unauthorized repairs, or use contrary to SureFire's user manuals.

Should a replacement product be needed, SureFire reserves the right to replace an obsolete product with a current production, like model. In cases where an issue with a SureFire product is not covered under this warranty, SureFire can arrange for the product to be repaired for a reasonable fee.

Standard Disclaimer

Except as specified above or prohibited by applicable law, all express or implied conditions and warranties, including, without limitation, any implied warranty or condition of merchantability or fitness for a particular purpose, or accuracy of any informational content, are hereby excluded and disclaimed by SureFire. In no event will SureFire be liable for any special, direct, indirect, consequential, incidental, or punitive damages howsoever arising and regardless of the theory of liability, even if advised of the possibility of such damages. Products, prices, availability, specifications, and offers are subject to change or cancellation at any time without notice.

Warranty Claims

For claims, contact Customer Service at 714-545-9444 to obtain a Return Merchandise Authorization number (RMA#). Then, package the unit carefully and send to (no CODs):

SureFire, LLC.
Repairs Department, RMA# ____
17680 Newhope Street, Suite B
Fountain Valley, CA 92708

SureFire will pay any reasonable shipping costs to return the unit to you.

Installation & Operation

Kit Contents

The X300 kit typically includes:

• X300 WeaponLight
• Battery Cover
• Battery Cover Retaining Pin
• Two 123A Batteries
• Picatinny Crossmember

An illustration depicts the contents of the X300 kit: the weapon light itself, a battery cover, a battery cover retaining pin, two 123A batteries, and a Picatinny crossmember.

Battery Installation / Replacement

⚠️ WARNING

Use of substandard batteries can cause injury or property damage. Visit www.surefire.com/batterysafety.

1. Attach Battery Cover. (Refer to Figure 1: Diagram showing the attachment of the battery cover to the weapon light body.)
2. Insert 123A batteries with terminals oriented as shown in the engraved schematic on the X300 body. (Refer to Figure 2: Schematic illustrating the correct orientation for inserting two 123A lithium batteries into the weapon light, noting the positive and negative terminals. It also shows the hinge cover release latch and the optional retaining pin for securing the battery cover.)
3. Close Battery Cover until the compartment latch clicks and locks the cover in place.
4. To replace batteries, depress the latch to open the Battery Cover.
5. Install fresh batteries and re-secure the Battery Cover per the Installation directions above.
6. (OPTIONAL) Using pliers, insert the battery cover Retaining Pin through both holes in the latch bracket, until the pin locks in place and the latch cannot be released. (Refer to Figure 2.)

? CAUTION: Mixing a depleted battery with a new battery can cause damage to the weaponlight. Always use two fresh batteries when replacing old ones.

Mounting X300 to Weapon

⚠️ WARNING

ALWAYS confirm the weapon is unloaded and on SAFE before attempting installation.

The X300 ships with the Universal (marked "U") Crossmember installed. To attach the X300 to a Universal accessory rail, skip ahead to the "Attaching to Host Weapon Rail" instructions. To attach the X300 to a Picatinny rail, the Universal Crossmember must be replaced with the included Picatinny Crossmember (marked "P"). Proceed to the "Installing / Replacing the Crossmember" section above.

Installing / Replacing the Crossmember

1. Loosen the Rail-Adjustment Bolt by turning counterclockwise until the Crossmember is fully exposed. (Refer to Figure 3: Illustration demonstrating the process of loosening the Rail-Adjustment Bolt to expose the crossmember for removal or adjustment.)
2. Remove the Crossmember by lifting it out; store it for future use.
3. Place the Crossmember into the slot, ensuring that the Crossmember's front edge is facing forward (toward the bezel) and the "wedge" is facing rearward.
4. Push the Crossmember all the way forward and, while holding the Crossmember in place, tighten the Rail-Adjustment Bolt by turning clockwise until the movable Rail Guide overlaps the Crossmember "wedge," locking it securely in place. (Refer to Figure 4: Diagram showing the crossmember positioned correctly and the Rail-Adjustment Bolt being tightened clockwise to secure it, with the movable rail guide overlapping the crossmember's 'wedge'.)

Attaching to Host Weapon Rail

Note: The appropriate Crossmember MUST be installed ("U" for Universal rails; "P" for Picatinny rails) to attach the X300 to a weapon's accessory rail. Some pistols with a MIL-STD-1913 rail may require the "U" crossmember to properly interface with the location of the front trigger guard surface.

1. Adjust the gap between the stationary and movable Rail Guides by turning the Rail-Adjustment Bolt clockwise or counterclockwise until the gap is sufficiently wide to fit over the weapon accessory rail. (Refer to Figure 5: Diagram illustrating the adjustment of the gap between the stationary and movable rail guides using the Rail-Adjustment Bolt, preparing the light to fit onto a weapon's accessory rail.)
2. Align the Fixed Rail with the weapon's accessory rail and hinge the X300 over the cross slot of the host weapon.
3. Mate the Crossmember with the corresponding slot in the weapon's accessory rail.
4. Using a torque wrench and a flat head bit, tighten to 8 in-lb onto a polymer pistol rail and to 8-9 in-lb on a metal pistol rail. If a torque wrench is not available, tighten until snug and then apply an additional 1/4 turn. Do NOT overtighten! The Rail Adjustment Bolt will break if excessive force is applied with a tool. (Refer to Figure 6: Diagram showing the SureFire X300 being aligned with and attached to a weapon's accessory rail, hinging over the cross slot and mating the crossmember.)

Light Operation

For momentary-on light operation, press and hold either the right or left side of the tailcap toggle switch; release to turn the light off. (Refer to Figure 6.)

For constant-on operation, rotate the tailcap toggle switch up or down; rotate in the opposite direction to turn the light off. (Refer to Figure 6.)

Note: Remote switches are available for SureFire X-Series WeaponLights. Visit www.surefire.com/parts-accessories/switches.html.