Henning +6 Basepad and Spring 140mm for Carry Optics & Limited Optics fits Glock 9mm (17/34/47)
The Henning H141-GS9 is a competition magazine extension kit for Glock 17, 34, 19X, 45, and 47 pistols — CNC-machined from 6061-T6 billet aluminum and paired with a 13-coil stainless steel spring. It extends your factory 17-round Glock magazine to 23 rounds at 141.25mm, keeping you within the USPSA gauge for Carry Optics, Limited, Limited Optics, and 3-Gun divisions. Designed by Henning Wallgren, a veteran USPSA and IPSC champion who has been competing and developing competition gear since 2006.
Important: Factory Glock Magazines Only
This Henning +6 Basepad is designed for factory Glock 9mm magazines. It is not compatible with Glock-pattern magazines manufactured by Mec-Gar or Magpul.
- Factory Glock Magazine: Compatible. View Factory Glock 17-Round Magazine.
- Mec-Gar Glock Magazine: Not compatible with this basepad. If you are using the Mec-Gar 18-Round Steel Glock Magazine, use the Springer Precision 140mm Magazine Extension for Mec-Gar Glock Magazines.
- Magpul PMAG GL9: Not compatible with this basepad. If you are using a Magpul PMAG GL9, use the Arredondo Basepad & Spring for Magpul Glock Magazines.
Not sure which magazine you have? Verify the magazine manufacturer before ordering this basepad.
Specifications
- SKU: H141-GS9
- Capacity gain: +6 rounds (17→23 on factory Glock 17/34 magazine)
- Final magazine length: 141.25mm (5.56") — passes USPSA gauge
- Material: CNC-machined 6061-T6 billet aluminum
- Spring: 13-coil stainless steel extended magazine spring (included)
- Retention: Black nitride finished cap screw
- Fit: Tight-fit to factory Glock magazine body
Compatible Glock Models
Fits factory Glock G17, G34, G19X, G45 and G47 magazines in 9mm. Also installs on factory 31-round and 33-round Glock magazines — use the factory spring on those (the extended spring is only needed on 17-round tubes).
Spring Options
Magazine Spring & Follower Options
This Henning +6 140mm Basepad for Glock 9mm is available with several spring and follower options depending on your intended setup. An extra power magazine spring is recommended when using this extended basepad.
Want to retain slide lock? Select the Henning Extra Power Magazine Spring and reuse your factory Glock follower. This is the recommended setup for customers who want to retain last-round slide lock.
Important: The MBX and CSRG competition spring and follower kits are designed to maximize usable magazine capacity and do not retain last-round slide lock.
- No Spring: Basepad only. This option does not include a replacement magazine spring. An extra power spring is recommended when using this extension.
- Henning Extra Power Spring: Uses your factory Glock follower (factory follower not included). This is the recommended option if you want to retain last-round slide lock. View Henning spring details & compatibility.
- MBX Ultra Max Spring & Follower: Competition spring and follower setup designed to maximize usable magazine capacity. View MBX Ultra Max details & compatibility.
- CSRG Gen 2 Competition Spring & Follower Kit: Competition spring and follower setup designed to maximize usable magazine capacity. View CSRG Gen 2 details & compatibility.
Before selecting an option: Review the linked product page for specific magazine compatibility, capacity information, installation, and other product-specific details.
Division Legality
At 141.25mm installed length, this basepad is USPSA legal for:
- Carry Optics
- Limited
- Limited Optics
- Limited 10
- Open
- 3-Gun
Not legal for Production division, which limits magazines to 10 rounds.
Installation
Remove the factory baseplate, pull the spring and follower, replace with the included Henning spring, compress, and slide the new basepad on. The cap screw secures the pad to the magazine body. No modifications to the magazine tube required.
Installation
- Disassemble the magazine: Remove the existing basepad and floorplate, then carefully remove the factory spring and follower from the magazine tube.
- Install your selected spring and follower:
- Henning Extra Power Spring: Remove the factory spring from the factory Glock follower. Attach the Henning spring to the factory follower, making sure the spring clicks securely into place, then reinstall the spring and follower into the magazine tube.
- MBX or CSRG Spring & Follower Kit: Remove the factory spring and follower completely and install the spring and follower supplied with the selected competition kit.
- Install the Henning basepad: Once the spring and follower are installed, compress the spring until it is flush with the bottom of the magazine tube. While holding the spring in place, slide the Henning basepad fully onto the magazine tube.
- Secure the basepad: Once the basepad is fully installed, use the provided Allen key to tighten the retaining screw on the back of the basepad. Tighten the screw until the basepad is securely retained on the magazine.
- Set the spring (MBX & CSRG kits only): After installation, fully load and unload the magazine 3–5 times to set the new competition spring before use.
DISCLAIMER: This product is not manufactured, authorized, endorsed,
or warranted by GLOCK. GLOCK does not warrant or represent that
this product is compatible with GLOCK pistols.
DISCLAIMER: “GLOCK” is a federally registered trademark of
GLOCK, Inc. and is one of many trademarks registered by GLOCK, Inc.
and GLOCK Ges.m.b.H. Neither Ben Stoeger Pro Shop nor this site are
affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or
GLOCK Ges.m.b.H. The use of “GLOCK” on this page is merely to
advertise the sale of pistols, parts, components or accessories that are
compatible with GLOCK. For additional genuine GLOCK, Inc. and
GLOCK Ges.m.b.H. products and parts visit www.glock.com.
2 Reviews
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Works great!
I bought one to try out and do prefer the over the polymer ones, I had used in a march indoors and dropping them on cement , no issues , stayed in place , will buy more
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Better than TTI
Bought a few of these after buying a number of the TTI extended mags. For starters these are easier to install, but more importantly the screw mechanism doesn't come into contact with the magwell on my Platypus, unlike the TTI pads.
