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+6/5 Magazine Extensions

SKU: 2834
Extra Rounds / More Style!

We've added some design style to the new Magazine Extensions by GS/Double Diamond. These attractive magazine extensions allow you to add up to 6 extra rounds to your existing magazines. Each comes with an extra power spring to feed the additional rounds consistently every time and is designed with a very innovative system to secure the base plate to the magazine body.

The magazine base plate inserts are also designed for a universal fit allowing for custom color combinations, and increased style and functionality, available separately here.

We encourage you to watch the video for a complete installation demonstration.

Available for the following models:
  • G17/22/31 - +6 9mm / +5 .40cal/.357
  • G19/23/32 - +5 9mm / +4 .40cal/.357
  • G26/27/33 - +5 9mm / +4 .40cal/.357
  • Big Stick 9mm - +5 9mm

Please Note: The Big Stick 9mm Extension is designed to replace the factory extension on the Glock Factory Big Stick 33rd 9mm MagazineThis extension includes an extra power replacement spring and will increase your capacity to 36 rounds.

Customize your look and style with our interchangeable baseplates, available separately here!

Also available in a +2 model for the Glock 43 found here.

Sold separately or pre-installed on the magazine of your choice… go here to save on the combo!

Need the right tool for swapping out your factory base plates?
Click Here
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Ratings & Reviews

6 reviews

3 stars
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+5 All Day Long!!


Love the design and feel of the mag extension! +5 on my Glock 19 Gen 5 just as advertised. Thanks guys, I will certainly purchase a few more from the Glock Store.

Provided Spring Extension Issues


The spring that came in the package for the extended mag for the 19 was to wide. Not fitting correctly inside the magazine. the factory spring is a little shorter but seems to be feeding fine even with the extension.

Quality looks good, packaging says +5/4 though


It says +6/5 on the site but the 2 gold extensions I received in the mail say +5/4. Did I receive the right one? I don't see any +5/4 on your site so I'm assuming it's just mislabeled.

Not meant for 10rnd magazine but will work with stock spring


This magazine extension is meant for non 10rnd magazine due to the 10rnd magazine spring being thinner, but as noted from the other reviewer....it will fit with stock spring and cycle properly.

Top quality, top notch performance!


I really like these extensions! Not only do they work on the MaPul magwell (half the price of these extensions!) but seem to balance my 17 better than it was. Going to by a few more for the 17 and my 23 with the extra Briley .357 and .40 barrels. I have .357 and .40 magazines so this should be a good test all around for them.



I want to start off by saying they look amazing, I order three different colors, red, black and silver. Two out of the three I ordered work flawlessly. Only one the spring gets stuck in the bottom of the mag. Ive tried it in four different mags with the same result. I contacted customer service and they were very helpful, they are sending me a new spring.