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GMCG Arms Glock Magazine Extension (v2): Adds 2 rounds to 9mm mags

(1 customer review)




NOTE: Image is of V1 extension, new pics coming soon.

Lightweight, colorful, and affordable. The Gunny McGunsmith +2 Glock magazine extension is everything you need and nothing you don’t.

Thanks to the durable, but lightweight polymer construction, you can add extra rounds to your magazine for use in competition and self defense without worrying about upsetting your gun’s balance.

Over a dozen variations brought us to v1, resulting in a fit that’s perfectly tailored to a wide range of magazines and 9mm Glocks. And now, after further research and development we’re releasing v2. The v2 model is even sleeker with a rear locking pin and cutouts along the side which aid in removal from mag pouches and the like. Pictures of v2 are coming soon!

Affordable? Yes. Cheap? No. With countless hours of print time under our belt, we know how to make 3D printed gun parts that last.

Don’t see the color you want, feel free to contact me at and let me know which color you’d like. I’ll do my best to get it for you.

As with all other parts, our Glock magazine extensions come with our 60-day money back guarantee and 30% of proceeds go towards charities and causes including the National Alliance on Mental Illness, Deterrence Dispensed, and the Natural Resources Defense Council.


  • Adds 2 rounds to your Glock 9mm magazine
  • Simple installation – see the video below
  • Rear locking pin to ensure your mag extension won’t come loose.
  • Cutouts to aid in gripping magazines
  • 1.7″ (42mm) x 1.16″ (29.5mm) x 0.70″ (18mm)
  • Printed in PETG: no warping and great chemical resistance!
  • Designed in house
  • Tested on both official 9mm Glock magazines and 3D printed Menedez mags

Shipping times will vary based on color chosen. If I have the color in stock, I?ll be able to print and ship in 1-2 business days. If I don?t have a color in stock, it will take a bit longer, but should be no more than 1-2 weeks in most cases. Feel free to email and ask what I have on hand at any given moment. ?

Installation Instructions

Note: Does not include extra power magazine spring. You will need to supply your own spring. Feel free to email me at if you’re having trouble finding a spring that will work with our Glock magazine extension.

Additional information


Black, Carmine Red, Space Gray, Semi-transparent Green, Blue, Orange (Limited Quantity)

1 review for GMCG Arms Glock Magazine Extension (v2): Adds 2 rounds to 9mm mags

  1. Cody A.

    Man, these mag extensions are great. This my first experience with 3D printed parts for my firearm, and I couldn’t be more impressed. You can definitely tell the quality of these parts as soon as you have them in your hand.

    The installation was a breeze, too. Even had that satisfying “click” of the 3D printed base onto the Glock magazine. No wiggle, nothing loose.

    As a CCL instructor, I will definitely be recommending this to all of my friends and students.

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