Cross Armory +5 Magazine Extension for Gen 1-5 Glock 17/22/31

(1 customer review)


  • Lightest Weight +5 for Glock 17/22/31 on the market – 1.35oz aircraft grade CNC aluminum
  • Lowest Profile +5 on the market – compact shape fits all magwells and holsters
  • Strongest and most reliable feeding spring – the first and last round feed crisp and clean
  • True Grip – most secure grip in the industry – engineered for wet or bloody hands or gloves
  • Easiest and most reliable Installation – clean simple and secure
  • Adds 5 additional rounds – increases a standard capacity Glock Brand or Glock clone magazine
  • PLEASE NOTE: This item cannot be shipped to the District of Columbia, California, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, Oregon, Vermont and Washington
  • We recommend using Red LocTite to secure the screw permanently after installation
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The Cross Armory +5 Magazine Extension is designed to have the lightest weight, slimmest profile, strongest feeding spring, best grip and easiest installation in the industry.


We spent months purchasing every magazine extension on the market. The first thing we noticed was that there were a lot of bulky, overweight magazine extensions. We focused on a form factor that reduced the weight of the extension as much as possible, while keeping all the strength. We chose to make our extensions from scratch, out of a solid block of aircraft grade aluminum, which saved weight and kept all the needed strength. This made our Cross Armory +5 Magazine Extension the lightest weight and slimmest profile, all aluminum, magazine extension in the industry coming in at 1.35 ounces.

Next, we read all the reviews online and noticed that a lot of people noted that the competitor’s magazine extensions were not feeding well. We fixed this by engineering a new spring from scratch. The Cross Armory engineered spring, present in every Cross Armory +5 Magazine Extension, has an additional loop in the spring, as well as reinforced corrosion coated spring steel, PLUS a flat base that matches the angle of the extensions base (this is a feature that the others have overlooked). These specific engineering features ensure that the first-round feeds just as crisp and clean as the last round.

Then we evaluated the grip. Most, if not all of the other mag extensions on the market had a weak grip or no true grip at all. We define true grip, as the ability to hold something with wet or bloody hands and/or gloves and pull on it. Noting this, we designed slots in the Cross Armory +5 Magazine Extension that were clean looking, but had a strong 90-degree angled ledge, at the front and at each side with engineered bite to hold your grip without snagging. The extra thought and engineering provided a true grip, for when your life depends on it.

Finally, we evaluated the installation and retention of the magazine. It appeared that everyone in the industry was trying to do something different or unique to attach their mag extension to the magazine. With that, they stuck us with wild complexity and over complication in the installation process that baffled even our own engineers (and one is an actual rocket scientist). We chose a new path; we believe that oftentimes the simple solution is the best and most reliable solution. We discarded over complications and went with a simple screw with lock-tight. Clean, easy, reliable installation.

We are confident that the Cross Armory +5 Magazine Extension is the best in the industry. We are willing to back it up, with a 100% no questions asked money back guarantee. If you don’t love it, we will give you your $ back.

*Magazine not included

PLEASE NOTE: This item cannot be shipped to the District of Columbia, California, Colorado, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, Vermont and Washington due to limited ammunition capacity laws.

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.








GLOCK 19/23/32 +5 MAG EXTENSION – ALL GEN – Adds 5 rounds of capacity

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Black, Blue, Gold, Purple, Red, Silver

1 review for Cross Armory +5 Magazine Extension for Gen 1-5 Glock 17/22/31

  1. Christian Coddington

    These are great baseplate extensions and super easy to install. I’ve run these baseplates on Gen 3 through Gen 5 Glock mags and they feed and function flawlessly. They aren’t overly bulky and aren’t over engineered. They lock in to place with a pre-thread locked set screw and washer. You can check out install videos as well as a range review on my YouTube channel!

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