Henning Group H141-GS9 • Glock 17 / 34 / 19X / 45
Henning Glock 17/34/19X/45 Magazine Extension
The Henning Glock 17/34/19X/45 Magazine Extension is a CNC-machined aluminum base pad designed for factory 9mm Glock magazines used in duty, carry, range training, practical shooting, and USPSA-style competition setups.
Quick answer: this is the Henning H141-GS9 Glock magazine extension for factory Glock 17, Glock 34, Glock 19X, and Glock 45 9mm magazines. With the included extended spring and factory follower, a standard 17-round Glock magazine can be configured for approximately 22–23 rounds. Available options may also include an MBX spring and follower setup for a 24-round practical shooting and USPSA-style configuration where slide lock-back is not needed.
Fits
Factory 9mm Glock G17, G34, G19X, and G45 magazines
Part Number
H141-GS9
Material
CNC machined 6061-T6 billet aluminum
Factory Follower Setup
Approximately 22–23 rounds with included extended spring
MBX Setup
Approximately 24 rounds for practical shooting use
Competition Length
Approximately 141.25mm / 5.56"
Fitment and Capacity Guide
This Henning Glock magazine extension is commonly chosen by shooters building a higher-capacity Glock 17, Glock 34, Glock 19X, or Glock 45 setup while keeping factory Glock magazine bodies.
| Magazine Type |
Spring / Follower Setup |
Approximate Capacity |
Best Use |
| Factory Glock 17-round 9mm magazine |
Included Henning extended spring with factory follower |
Approximately 22–23 rounds |
Duty, carry, training, and general range use where reliable lock-back is preferred |
| Factory Glock 17-round 9mm magazine |
Optional MBX spring and follower, when available |
Approximately 24 rounds |
Practical shooting and USPSA-style competition use where maximum capacity is preferred and slide lock-back is not needed |
| Factory Glock 31/33-round 9mm magazine |
Factory spring |
Approximately 37 rounds |
Range use and extended-capacity applications where legal |
Magazine body is not included unless specifically stated in the selected product option. Always test your magazine, spring, follower, ammo, and pistol combination before relying on it for duty, carry, competition, training, or defensive use. Confirm all magazine-capacity restrictions for your location before ordering or using this product.
Why Choose the Henning Glock Magazine Extension?
The Henning Glock 17/34/19X/45 extension is designed as a true continuation of the internal shape of the factory Glock magazine tube. That design goal matters because the spring, follower, magazine body, and extension all work together to support reliable feeding.
- Factory magazine body compatibility: Built around factory Glock 9mm magazine bodies for Glock 17, Glock 34, Glock 19X, and Glock 45 platforms.
- Factory follower option: Provides an approximately 22–23 round setup with the included Henning extended spring and factory follower.
- MBX follower option: Provides an approximately 24-round setup for practical shooting and USPSA-style competition where slide lock-back is not needed.
- Competition-focused length: Extends the factory magazine to approximately 141.25mm / 5.56", making it a popular choice for practical shooting builds.
- Machined aluminum construction: CNC machined from 6061-T6 billet aluminum for a solid, durable base pad.
- Secure retention: Uses a tight magazine-body fit and black nitride-finished cap screw to secure the extension.
Spring and Follower Selection
Choose the spring and follower setup based on how the magazine will be used. The factory follower setup is the better choice when lock-back and general-purpose reliability are preferred. The MBX follower option is intended for practical shooting and USPSA-style use where maximum capacity matters more than slide lock-back.
Extended Spring with Factory Follower
Select this option for a standard factory Glock 17-round 9mm magazine when you want a duty, carry, training, or general range-use setup. This configuration provides approximately 22–23 rounds while keeping the factory follower.
MBX Spring and Follower Option
Select this option when available for practical shooting and USPSA-style competition use. This setup is intended for a 24-round magazine configuration where slide lock-back is not needed.
Factory 31/33-Round Magazines
When using this extension on a compatible factory Glock 31-round or 33-round 9mm magazine, use the factory spring rather than the included extended spring.
Complete the Glock Practical Shooting Setup
A magazine extension is usually one part of a complete Glock build. If you are setting up a Glock 17, Glock 34, Glock 19X, or Glock 45 for red dot use, range training, or practical shooting, these related Stonebridge Gunworks products and services pair well with this Henning extension.
Glock Direct Optic Cut
Build the pistol around a lower, stronger direct-mounted optic setup. Our Glock optic cut service supports popular footprints including RMR, SRO, Holosun C-Series, Holosun Comp, EPS, ACRO, 509T, and Vortex Defender options.
View Glock Optic Cut Service
Glock Extended Magazine Catch
A factory Glock reversible extended magazine catch can make reloads easier to access, especially when paired with extended magazine base pads and repeat reload practice.
Shop Glock Extended Magazine Catch
Glock Performance Trigger
The Glock Performance Trigger is a strong supporting upgrade for shooters building a Glock 17, Glock 34, Glock 45, or Glock 19X around optics, reload consistency, and practical shooting use.
Shop Glock Performance Trigger
More Glock Parts and Services
Shop Glock optic cuts, parts, accessories, and related Stonebridge Gunworks support items from the full Glock category.
View Glock Category
Fitment Checklist Before Ordering
- Confirm you are using a factory 9mm Glock magazine body for a compatible Glock 17, Glock 34, Glock 19X, or Glock 45 setup.
- Use the included Henning extended spring when installing on a standard 17-round factory magazine with the factory follower.
- Select the factory follower setup when reliable lock-back is preferred for duty, carry, training, or general range use.
- Select the MBX spring and follower option when building a practical shooting or USPSA-style magazine where 24-round capacity is preferred and slide lock-back is not needed.
- Use the factory spring when installing on a compatible factory 31-round or 33-round Glock 9mm magazine.
- Test each completed magazine with your chosen ammo before duty, carry, match, training, or defensive use.
- Verify local magazine-capacity laws and match rules before ordering or using any extended magazine setup.
Frequently Asked Questions
Which Glock magazines does this Henning extension fit?
This extension is intended for factory 9mm Glock magazine bodies commonly used with the Glock 17, Glock 34, Glock 19X, and Glock 45.
How many rounds does it add to a Glock 17 magazine?
With the included extended spring and factory follower, a standard 17-round factory Glock 9mm magazine can be configured for approximately 22–23 rounds.
What is the best setup for duty, carry, and general range use?
The included Henning extended spring with the factory follower is the better choice for duty, carry, training, and general range use where reliable slide lock-back is preferred.
What is the MBX spring and follower option?
The MBX spring and follower option is a practical shooting and USPSA-style competition setup that can provide approximately 24 rounds. This option is intended for shooters who do not need slide lock-back and want maximum usable magazine capacity.
Does this product include the magazine body?
No. This is a magazine extension kit. The factory Glock magazine body is not included unless a separate product option specifically states otherwise.
Can this extension be used on Glock 31-round or 33-round magazines?
Yes, it can be used on compatible factory Glock 31-round or 33-round 9mm magazines. When used on those magazines, use the factory spring.
Is this a good upgrade for a Glock red dot build?
Yes. For a Glock 17, Glock 34, Glock 19X, or Glock 45 with a direct-mounted red dot, this extension pairs well with a clean reload setup, extended magazine catch, Glock Performance Trigger, and practical shooting-focused training.
Is this extension legal everywhere?
Magazine-capacity rules vary by location and use case. Confirm your state, local, and match rules before ordering, possessing, or using any extended magazine setup.
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