Magazine Extension for Glock G17, G34, G19X, G45

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Part Number: H141-GS9

Availability: In Stock.

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Customer Reviews

USPSA Carry Optics/Limited Division Magazine Extension for Glock G17, G34, G19X, G45

The Henning Group Magazine Extension Kit for Glock 17/34/19X/45 increases magazine capacity from 17 to 23 rounds! Our design has been thoroughly tested and used extensively by Law Enforcement and Competitive Shooters. The design of our extension is a true extension of the internal shape of the factory magazine tube. Combined with stainless steel, 13-coil magazine spring it is a proven and reliable solution. Our Glock 17/34/19X/45 magazine extension is CNC machined from 6061-T6 billet aluminum. Fit to magazine body is tight and secured using a black nitride-finished cap screw. The Henning Group Plus 6 magazine extension can be installed on any Glock G17 or G34 magazines, including the 31/33 round magazines.

If installed on a 17-round magazine, use the included spring to ensure proper function. If installed on a 31/33 round factory magazine, use the factory spring!

For USPSA competition shooters, these extended base pads are legal for USPSA Limited and Open competitions as well as 3-Gun. Attached to the factory Glock magazine, they extend the magazine to 141.25mm length (5.56"). Whether you want to be competitive or not, these pads will extend the capacity of your Glock 17/34 magazines.

Again, note:

- Extends the capacity on factory 9mm Glock 17/34 magazines from 17 rounds to 23 rounds. (extended spring included)

- Extends the capacity of factory 9mm Glock 31 round and 33 round magazines to 37 rounds (use with factory spring)

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5.0

A++++++

Works great, solid construction. 10/10 get yo self one to try.

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Reviewed by: (Verified Buyer) Austin Charlesworth from Kansas on 2/4/2026

Henning Perfection.

I have 6 of these, 6,000 rounds between them. Have not removed to clean the inside of the magazine once. Zero issues. Dirt, sand, muddy puddles, it feeds and goes bang every time.

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Reviewed by: (Verified Buyer) Etz from KC on 9/3/2025

Magazine Extension for Glock G17, G34, G19X, G45

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