A Step-by-Step Tutorial: How to Install and Maintain a GLOCK 42 Magazine Extension

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Written By hazel Loper

The GLOCK 42 has emerged as a powerful, lightweight, and compact pistol that is suitable for concealed carry and self-defense purposes. This handgun or pistol offers numerous benefits, but has some limitations. A GLOCK 42 pistol has limited magazine capacity which is a major drawback of this gun. To increase its firing capabilities without frequent reloading, GLOCK 42 magazine extensions come into play. Want to install a magazine extension to your GLOCK 42 handgun? This blog will help you install and maintain a GLOCK 42 magazine extension to maximize its ammunition capacity as well as enhance its concealability.

The GLOCK 42 holds an immense popularity among gun enthusiasts due to its reliability, versatility, and sleek, compact design.  However, gun owners can add a magazine extension to enhance its capacity without sacrificing concealment.  This guide will walk you through the installation process, and maintenance tips.

Reason To Upgrade a GLOCK 42 with Magazine Extension

GLOCK 42 Magazine Extensions are used for several compelling reasons. Before diving into the installation process, it’s essential to understand the top reasons to upgrade a GLOCK 42 with magazine extension:

  1. Increased Magazine Capacity

One of the significant advantages of adding a magazine extension to a GLOCK 42 is to increase magazine capacity. The standard GLOCK 42 magazine has the potential of only six rounds. With an extension, gun owners can typically add one or more rounds that can be a game-changer in emergencies.

  1. Improved Grip and Control

The magazine extension not only increases your capacity but also improves your grip and control over your GLOCK 42. This additional control can make a critical difference, allowing for better handling and accuracy, ensuring that your shots hit their mark.

  1. Maintained Concealability

While the GLOCK 42 is already a compact handgun, the magazine extension does not compromise concealability. It maintains a slim profile to ensure that your concealed carry remains hidden under clothing while providing additional rounds of firepower for your defense.

How to Install a GLOCK 42 Magazine Extension

Step 1: Gather Your Tools

Before starting the installation process, make sure you have the necessary tools and components to install the magazine to your concealed carry gun. Here’s what you’ll need:

  • GLOCK 42 handgun
  • GLOCK 42 magazine extension kit
  • A punch or GLOCK tool
  • A screwdriver
  • A cleaning kit for maintenance

Step 2: Safety First

Before installing the GLOCK 42 magazine extension, ensure that your firearm is not loaded. Remove the magazine from your GLOCK 42 and visually inspect the chamber to check that it’s empty. Safety is of the utmost importance when working with firearms.

Step 3: Disassembly

Now, it’s time to disassemble the GLOCK 42 for the installation. Follow these steps:

  • Pull down the takedown lever tabs on either side of the frame to release the slide.
  • Slide the upper assembly forward and off the frame.
  • Remove the recoil spring assembly and barrel from the slide.
  • After the slide is removed, carefully remove the magazine spring and follower from the magazine.

Step 4: Installing the Magazine Extension

Here’s how you can install the magazine extension:

  • Take the baseplate off your GLOCK 42 magazine by using a punch or GLOCK tool.
  • Replace the standard magazine spring and follower with the extended versions included in the extension kit.
  • Slide the GLOCK 42 magazine extension onto the magazine tube.
  • Reattach the baseplate securely, ensuring that it clicks into place.

Step 5: Reassembly

Now that you have the magazine extension in place, it’s time to reassemble your GLOCK 42 magazine extension:

  • Insert the extended magazine into your GLOCK 42’s grip.
  • Slide the upper assembly back onto the frame.
  • Push the slide rearward until it locks into place.
  • Perform a function test to ensure your GLOCK 42 cycles properly.

Maintenance Tips

Proper maintenance ensures the longevity and reliability of your GLOCK 42 magazine extension. Follow the below tips to keep it in good condition:

  • Regularly clean and lubricate the magazine extension to prevent malfunctions.
  • Check for any signs of wear or damage, such as cracked baseplates or weakened springs.
  • Change worn-out or damaged parts immediately to maintain the extension’s performance.


Maximizing concealed carry with GLOCK 42 extended mags is a smart choice for gun enthusiasts. Adding extended magazines to your handguns can offer many benefits, including increased ammunition capacity, better grip and control, and maintain concealability. By following the step-by-step process outlined here, you can easily install your GLOCK 42 magazine extension. Also, it is important to regularly maintain the magazine extension to ensure its durability and reliability.

Are you considering purchasing a GLOCK 42 magazine extension? Look for a reliable manufacturer, explore their wide selection of high-quality extensions and take your shooting experience to the next level. It is recommended to explore the wide array of GLOCK 42 magazine extensions available from reputable brands and select the one that aligns with your specific needs.


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