Will a Glock Gen 6 Fit a Glock Gen 5 Holster? Complete Holster Compatibility Guide

Important differences between Glock Gen 5 and Gen 6 pistols can affect holster fit and retention.

The release of the Glock Gen 6 has left many current Glock owners asking an important question: Will a Glock Gen 6 fit a Glock Gen 5 holster?

The most accurate answer is: Many Glock Gen 6 pistols may fit holsters originally designed for the equivalent Gen 5 model, but compatibility is not guaranteed.

The overall dimensions of several Gen 6 models remain extremely close to their Gen 5 counterparts. However, Glock changed portions of the frame, trigger guard, grip, muzzle area and optic-mounting system. Those seemingly small changes can affect how a precision-molded holster fits, retains and releases the firearm.

A Gen 6 Glock should therefore be tested in the exact holster before the combination is used for concealed carry, duty use or everyday carry.

The Quick Answer

A Glock Gen 6 may fit a Gen 5 holster when all of the following are true:

• The holster was made for the same Glock model.

• The firearm seats completely inside the holster.

• The trigger guard remains fully protected.

• The holster provides secure and predictable retention.

• The firearm can be drawn without binding.

• The optic, sights and accessories have adequate clearance.

• Any active-retention mechanism engages properly.

• The firearm does not contact the holster in a way that could affect the trigger or controls.

However, simply being able to push the Gen 6 pistol into a Gen 5 holster does not prove that the holster is compatible.

A correct holster fit should be secure, repeatable and safe.

What Changed With Glock Gen 6?

Glock officially launched its Gen 6 line in the United States on January 20, 2026. The initial lineup included the Glock 17 Gen 6, Glock 19 Gen 6 and Glock 45 Gen 6. Glock identified updated grip geometry, revised frame ergonomics, a flat-faced trigger and a new optic-ready system among the generation’s principal changes.

Some of the most noticeable external changes include:

• A more pronounced palm swell

• Revised grip contours

• A longer integrated beavertail

• An undercut trigger guard

• Textured thumb-rest areas

• Updated frame texture

• Deeper front slide serrations

• Revised muzzle and recoil-system geometry

• A new optic-ready mounting arrangement

Several of these changes improve the way the pistol feels in the hand. They can also influence holster compatibility because many molded holsters use the trigger guard, dust cover, frame and slide as retention or indexing points. Safariland’s early testing specifically identified the revised trigger guard and muzzle area as important fit considerations.

Glock 19 Gen 6 vs. Glock 19 Gen 5 Dimensions

The Glock 19 provides a useful example of why the answer is not a simple yes or no.

Measurement	Glock 19 Gen 5	Glock 19 Gen 6
Overall length	7.28 inches	7.28 inches
Slide length	6.85 inches	6.85 inches
Overall width	1.34 inches	1.35 inches
Slide width	1.00 inch	1.00 inch
Height with magazine	5.04 inches	5.04 inches
Trigger distance	2.76 inches	2.68 inches

On paper, these pistols appear nearly identical in size. Glock lists the same overall length, slide length, slide width and height for both generations. The listed overall width differs by only 0.01 inch.

That does not mean every Gen 5 holster will fit the Gen 6 correctly.

Holsters are not shaped around only the pistol’s overall length and width. A molded holster may depend on very specific contours around the trigger guard, accessory rail, ejection port, slide, dust cover or muzzle.

Even a minor contour change can alter:

• How deeply the firearm seats

• Where the holster produces retention

• How much force is needed during the draw

• Whether the holster releases the firearm smoothly

• Whether an active-retention device aligns correctly

This is why dimensional similarity should be treated as a good sign—not as final proof of compatibility.

Will a Glock 19 Gen 6 Fit a Glock 19 Gen 5 Holster?

A Glock 19 Gen 6 will likely fit many Glock 19 Gen 5 holsters, particularly open-bottom friction-retention designs, but every holster must be checked individually.

The G19 Gen 5 and G19 Gen 6 share the same listed overall length, slide length, slide width and height. This gives many existing holster designs a strong chance of working.

The areas most likely to create a fit difference are:

• The reshaped trigger guard

• The undercut beneath the trigger guard

• The thumb-rest areas on the frame

• The muzzle and recoil-spring area

• The holster’s exact retention point

• The optic and sight configuration

• Any attached weapon light or laser

A holster that retains primarily around the slide may respond differently than one that creates a pronounced retention point around the trigger guard.

Therefore, one manufacturer’s Glock 19 Gen 5 holster may fit the Gen 6 perfectly while another company’s holster may be too tight, too loose or unable to seat completely.

Will a Glock 17 Gen 6 Fit a Glock 17 Gen 5 Holster?

The Glock 17 Gen 5 and Glock 17 Gen 6 have the same published overall length, slide length, overall width, slide width and height. Both are listed at 7.95 inches long, with a 7.32-inch slide and a 1-inch slide width.

That dimensional similarity suggests that many Glock 17 Gen 5 holsters may accept the Gen 6 model.

However, the Gen 6 Glock 17 uses revised geometry near the muzzle and recoil system. Safariland found that changes in the muzzle area could affect how certain holsters interact with an internal muzzle plug. The company reported that some designs worked while other configurations required additional fit evaluation or revised components.

The Glock 17 Gen 6 should not automatically be assumed compatible with every Glock 17 Gen 5 duty or light-bearing holster, even when it appears to fit.

Will a Glock 45 Gen 6 Fit a Glock 45 Gen 5 Holster?

The Glock 45 combines a compact-length slide with a full-size frame. Glock retained that general configuration for the Gen 6 model while adding the new generation’s grip, trigger, texture and optic-ready updates.

Many existing Glock 45 Gen 5 holsters may work with the Gen 6 pistol, especially those with straightforward friction retention. Nevertheless, the frame and muzzle changes should still be checked.

Do not assume that a holster fits simply because it was previously marketed for both the Glock 19 and Glock 45. The full firearm, retention system, muzzle design and accessory configuration must all be considered.

Why Trigger-Guard Changes Matter

The trigger guard is one of the most important areas in a molded concealment holster.

Many IWB and OWB holsters produce their familiar retention “click” by placing controlled pressure around the trigger guard. Glock Gen 6 incorporates an undercut trigger guard and revised surrounding frame geometry.

Depending on the holster design, the changes may cause the firearm to:

• Seat normally

• Fit more tightly than expected

• Lose some of its previous retention

• Stop before it is fully seated

• Rub against an unintended area

• Draw less smoothly

A holster’s retention screws may allow minor tension adjustment, but they cannot correct every compatibility problem. Adjustment should not be used to force an incompatible pistol and holster to work together.

Light-Bearing Holsters Require Extra Attention

A light-bearing holster is usually built around a specific firearm and weapon-light combination.

In many light-bearing designs, the weapon light becomes one of the holster’s primary retention or indexing points. This means compatibility depends on more than whether the pistol itself is a Glock Gen 5 or Gen 6.

You must verify:

• The exact Glock model

• The firearm generation

• The exact weapon-light model

• The optic configuration

• The holster’s listed fit

• The retention system

• Muzzle and sight clearance

For example, a holster made for a Glock 19 with a Streamlight TLR-7 SUB should not automatically be treated as compatible with a TLR-7 X, TLR-7 HL-X or another similarly named light.

Safariland’s Gen 6 testing found that revised muzzle geometry could make certain light-bearing holsters feel unusually tight, even when the pistol could technically be inserted. The company emphasized the difference between a firearm merely entering a holster and the complete setup passing proper retention and fit testing.

Does the Gen 6 Optic System Affect Holster Fit?

Glock Gen 6 pistols use a new optic-ready arrangement. Glock states that standard-frame Gen 6 pistols include three optic plates that allow supported optics to attach directly to the slide through the plate system. This differs from the traditional Gen 5 MOS arrangement.

The mounting system itself may not prevent the pistol from fitting a properly cut holster. However, the installed optic can affect compatibility.

Check the following:

• Optic length

• Optic width

• Optic height

• Position of the optic on the slide

• Height of the front and rear sights

• Width and depth of the holster’s optic cut

• Clearance around enclosed-emitter optics

An optic-ready holster is not automatically compatible with every red dot.

Large optics, enclosed-emitter designs and unusually tall sights may require additional clearance.

Active-Retention Holsters vs. Friction-Retention Holsters

Different holster types respond differently to generational changes.

Friction-retention holsters

Many concealed-carry holsters hold the firearm through molded friction around the slide, trigger guard or both. Because they usually contain fewer mechanical components, some friction-retention Gen 5 holsters may accommodate the Gen 6 with little or no noticeable difference.

Fit still needs to be verified.

Active-retention holsters

Duty and security holsters may use levers, locks, hoods, internal blocks or muzzle plugs. These parts must align and operate exactly as intended.

A pistol that enters an active-retention holster but does not fully engage its locking system is not properly compatible.

Safariland reported that many of its existing Gen 5-compatible designs worked with Gen 6 pistols, but it also identified model-specific concerns involving muzzle plugs and light-bearing configurations.

This demonstrates why the holster manufacturer’s current fit chart should be consulted whenever an active-retention system is involved.

How to Check Glock Gen 6 Holster Compatibility

Before testing, completely unload the firearm in a safe location. Remove the magazine, clear the chamber and keep live ammunition away from the work area.

Test the holster off the body.

1. Verify the exact model

A Glock 19 Gen 6 should be tested in a holster specifically intended for the Glock 19—not simply a holster labeled for “compact Glocks.”

2. Insert the unloaded firearm slowly

Do not force the pistol into the holster. Stop if excessive resistance appears before the firearm reaches its normal seated position.

3. Confirm complete seating

The firearm should sit at the proper depth. The trigger guard, slide and muzzle should align as intended.

4. Inspect trigger protection

The holster should protect the trigger from unintended access. No holster material, hardware or accessory should contact the trigger.

5. Check retention

The pistol should remain secure during normal movement while still drawing smoothly and consistently.

A fit that is excessively loose is not acceptable. A fit that requires excessive force is also a problem.

6. Check the controls

Verify that the holster does not unintentionally press against:

• The trigger

• Magazine release

• Slide stop

• Takedown controls

• Weapon-light switches

7. Check optic and sight clearance

The optic and sights should not scrape, catch or prevent the firearm from seating.

8. Test the retention mechanism

When using active retention, confirm that every lock or hood engages and releases correctly.

9. Repeat the test

Insert and draw the unloaded firearm multiple times. The result should remain smooth, predictable and consistent.

Do not carry the combination when there is uncertainty about fit.

Can You Modify a Gen 5 Holster to Fit a Gen 6 Glock?

We do not recommend forcing, cutting, grinding or heating a holster unless the work is performed or specifically approved by the holster manufacturer.

An incorrect modification could:

• Reduce trigger coverage

• Weaken retention

• Create a sharp edge

• Damage an active-retention system

• Affect the draw

• Cause the firearm to sit at the wrong depth

• Void the manufacturer’s warranty

Adjustable retention hardware can make minor tension changes. It cannot make every incompatible holster safe or reliable.

When the fit is questionable, the better option is to purchase a holster verified for the exact Glock model, generation, optic and weapon light.

The Bottom Line

Will a Glock Gen 6 fit a Glock Gen 5 holster? In many cases, it may—but there is no universal answer.

The Glock Gen 6 pistols remain very close in overall size to their Gen 5 equivalents. That similarity allows many existing holsters to work, and some holster manufacturers have already verified compatibility across multiple generations.

However, Glock changed important areas of the frame and muzzle. Those changes can affect molded retention, trigger-guard engagement, muzzle plugs and active-retention mechanisms.

Never base compatibility solely on the fact that the firearm can be pushed into the holster.

A compatible holster should:

• Be made for the correct firearm and accessories

• Allow the pistol to seat completely

• Protect the trigger

• Provide secure retention

• Permit a smooth and predictable draw

• Clear the optic and sights

• Operate every retention mechanism correctly

When purchasing a holster for a Glock Gen 6, select an option that specifically lists your exact model and configuration. When your setup is not listed, contact the holster manufacturer before ordering.

Browse the Glock holster options available from Indy Concealment, or contact us when you need help identifying the correct holster for your firearm, optic and weapon-light combination.

Disclaimer

Firearm and holster compatibility can vary by model, generation, accessories and manufacturer. Always verify that the firearm is unloaded before checking fit. This article is provided for general informational purposes and is not a substitute for the firearm or holster manufacturer’s instructions.

Will a Glock 19 Gen 6 fit a Glock 19 Gen 5 holster?

Many Glock 19 Gen 5 holsters may fit the Glock 19 Gen 6 because the two pistols have nearly identical published overall dimensions. However, changes to the trigger guard, frame and muzzle mean that each holster must be tested or verified by its manufacturer.

Are all Glock Gen 6 pistols the same size as Gen 5 pistols?

The equivalent Gen 5 and Gen 6 models have very similar published dimensions, but Glock made external contour and component changes that can affect holster fit.

Can I use a Gen 5 light-bearing holster with a Gen 6 Glock?

Possibly, but the exact pistol and weapon-light combination must be verified. Light-bearing holsters frequently use the light as a retention or indexing point, and revised muzzle geometry can also affect fit.

Will a red dot prevent a Gen 6 Glock from fitting a Gen 5 holster?

The optic can prevent proper fit when the holster’s optic cut does not provide enough clearance. Verify the specific red dot, sight height and holster cut.

Is a retention click proof that the holster fits?

No. A click may indicate that one retention point engaged, but it does not prove that the firearm seated completely, that the trigger is protected or that an active-retention system works correctly.

Can I loosen the retention screws to make the Gen 6 fit?

Retention screws can provide minor tension adjustment. They should not be used to force an otherwise incompatible firearm into a holster.

Should I carry a Gen 6 Glock in an unverified Gen 5 holster?

No. Verify compatibility with the holster manufacturer or carefully evaluate the exact unloaded firearm-and-holster combination before carrying it.

Trademark and Affiliation Disclaimer

GLOCK, Streamlight, Safariland, and all other product names, trademarks, service marks, and registered trademarks mentioned in this article are the property of their respective owners. They are used only for identification, compatibility discussion, and informational purposes.

Indy Concealment is an independent holster manufacturer and is not affiliated with, sponsored by, endorsed by, or otherwise associated with GLOCK, Inc., Streamlight, Inc., Safariland, LLC, or any other manufacturer mentioned in this article unless expressly stated otherwise.