Glock 34 with Surefire X300 IWB Holster

Inside Waistband Holster for Glock 34 with Surefire X300U-A/B

This Inside Waistband (IWB) taco-style holster is designed for the Glock 34 with the Surefire X300U-A or X300U-B weapon-mounted light. Retention is on the light body—not the pistol—so the holster will not function properly without the light mounted on the firearm.

Firearm & Generation Compatibility

Select the appropriate Glock generation for the best fit. The holster is designed to fit the following pistols, with additional muzzle length extending beyond the slide on shorter models, as long as the Surefire X300U-A/B is mounted correctly:

• Glock 19, 17, 45, 47, and 34 (Gen 5)
• Glock 19, 17, 22, 23, and 34 (Gen 3 or Gen 4)

Not compatible with the Glock 23 Gen 5.

Precision Fit & Construction

Our holsters are vacuum-formed using a precision-machined mold built from a CAD model of the actual firearm and Surefire X300U light. Each holster is formed, trimmed, folded, and finished in-house.

Final fit and function checks are performed using the specific pistol and light combination to ensure secure retention and a consistent draw. Retention is easily adjusted so you can set the holster to your preferred draw resistance.

Surefire X300U-B Light Information & Purchase

Technical details on the Surefire X300U-B weapon light can be found on the official Surefire X300U-B information page .

Our preferred light for this holster is the Surefire X300U-B, which is available directly from us at Surefire X300U-B Weapon Light – Four Brothers Holsters .

Threaded Barrel Compatibility

The holster is built to accommodate threaded barrels and uses an open-muzzle design, allowing extended barrels and certain muzzle devices to protrude from the holster.

Key Features

• Made from durable .093" thermoplastic (Kydex-style) material
• Adjustable retention for personalized draw tension
• High sweat guard standard; medium and low sweat guard heights available on request
• Holster profile cut to allow clearance for most red dot sights on the pistol
• Minimal material and smooth edges for comfort and concealment
• Optional ModWing with two inserts to adjust belt-side leverage and reduce firearm printing under clothing
• Proudly made in the USA

IWB Belt Attachment Guidance

For help choosing between belt and no-belt attachment options for Inside Waistband carry, review our detailed guide: Inside Waistband Belt & No-Belt Attachments Explained .

Magazine Carrier Options

Matching Glock 9/40 magazine pouches are available in both IWB and OWB configurations:

• Glock 34 9mm IWB Magazine Pouch
• Glock 34 9mm OWB Magazine Pouch

Color Options

Not sure which holster color or pattern to choose? View real examples and comparisons in our Holster Color Guide .

Maintenance Recommendation

We strongly recommend applying a removable thread locker to each screw after adjusting your holster. This helps prevent screws from loosening or backing out during daily carry and training.

FAQs

Does this holster require the Surefire X300U-A or X300U-B?

Yes. Retention is based on the Surefire X300U-A/B light body, so the holster will not work correctly without the light attached to the pistol.

Which Glock models will this IWB holster fit?

This holster is designed around the Glock 34 slide length but fits Glock 19, 17, 22, 23, 45, 47, and 34 (Gen 3–5 depending on model) when the X300U-A/B is installed. It is not compatible with the Glock 23 Gen 5.

Is this holster red dot compatible?

Yes. The holster profile is cut to clear most popular red dot sights mounted on the pistol slide.

Will threaded barrels work with this holster?

Yes. The open-muzzle design supports threaded barrels and certain muzzle devices, which may extend slightly beyond the holster.

Can I adjust the retention?

Yes. Retention screws allow you to fine-tune how tightly the holster holds the pistol and light combination to match your preferred draw feel.

How does the ModWing help with concealment?

The optional ModWing uses interchangeable inserts to push the grip of the firearm inward against the body, helping reduce printing and improving concealment for Inside Waistband carry.

Where can I learn more about IWB belt attachments?

For an in-depth overview of belt clips, loops, and no-belt attachments for IWB carry, visit our Inside Waistband Belt Attachment Guide .