Inside Glock 20 Gen 4 Problems: Facts & Fixes

The GLOCK 20 Gen 4 emerges as a stalwart firearm. It promises exceptional accuracy, even at considerable distances. Renowned for its rugged design, it boasts advanced polymer construction that minimizes kickback and manages recoil.

The 10mm auto pistol finds its niche with the GLOCK 20 Gen 4. It offers the precision needed for that crucial finishing shot in diverse hunting experiences.

But like other firearms, it faces many problems.

But don’t worry; I have found practical solutions for you.

Let’s explore!

8 ProblemsWith Their Quick Solutions
Recoil Spring ProblemsCleaning and lubrication.
Extractor Blow-UpEnsure that the plunger pin is properly seated when reinstalling the extractor.
Failure to FeedConsider using some Wolf Springs.
Trigger ProblemYou can adjust the spring without disassembling the pistol if it has shifted off to the side.
Ejector IssueThoroughly clean the ejector and the surrounding area.
StovepipingInspect the recoil spring and replace it if necessary.
Jamming IssueLubricate all moving parts with appropriate gun oil.
Heavier Trigger PullEnsure your firing pin is straight and properly aligned to prevent primer bulges.
Glock 20 Gen 4 Problems

GLOCK 20 Gen 4 Problems with Practical Solutions

1. Recoil Spring Problems:

Recoil spring problems can significantly impact the performance of the Glock 20 Gen 4. The recoil spring assembly (RSA) experiences wear and tear over time, especially with the use of heavy loads.

In the Gen 4 model, issues with the stock recoil spring assembly can arise due to the stack-up of forces. It leads to malfunctions and reduced reliability.

This can affect the firearm’s proper operation, especially under high loads.


Let’s delve into a solution. When considering the area where the frame and slide make contact, minimizing recoil impact is vital to prevent damage and imprints.

Upgrading to a quality IMSI recoil spring assembly paired with a KKM barrel offers a viable solution.

Opting for a 22lb flat recoil spring ensures precise fit and exceptional machining. It reduces the risk of plastic deformation and promotes consistent operation.

This upgrade addresses the significant wear associated with heavy loads. It ensures a smoother shooting experience.

2. Extractor Blow-Up Problem:

One prevalent issue that some Glock 20 Gen 4 owners encounter is the extractor blow-up problem.

After firing approximately 15 to 30 rounds, the extractor may fail to properly extract the spent casing from the chamber.

Instead, the casing might get stuck halfway, impeding the firearm from cycling correctly.

This malfunction can lead to damage to the extractor itself. It makes it unable to perform its intended function of extracting spent casings reliably.

When this happens, it can disrupt the firing process.


Start by carefully tearing down the slide to access its internal components. Once inside, deeply inspect the extractor to identify any signs of wear or damage.

Often, the root cause lies in the extractor’s tension.

To rectify this, consider replacing the plunger pin and ensuring it is properly seated during reassembly.

By taking these measures, you can significantly reduce the occurrence of blow-up problems and enhance the overall reliability of your firearm.

3. Failure to Feed Problem:

One common challenge encountered by Glock 20 Gen 4 owners is the failure to feed issue. It is particularly true when using powerful ammunition such as the Underwoods 180gr TMJ.

The gun may struggle to properly feed rounds, resulting in interruptions during firing.

This problem is often attributed to the combination of high slide speeds and heavier RSAs, especially in Gen 3 weapons.

Grip pressure can still influence the function of the firearm.

Some users have reported that using less potent ammunition can exacerbate the problem. This makes it crucial to find a balance between firepower and reliability.


One solution is to consider upgrading to Wolf Springs and installing updated followers in your magazines.

These enhancements can help regulate the feeding process, especially when using powerful ammunition.

Additionally, lightening your grip on the firearm can mitigate the problem by allowing for smoother operation.

Another crucial step is to replace worn-out components and consider polishing the feed ramp to ensure smooth cartridge transitions.

These measures can significantly improve the firearm’s feeding reliability.

4. Trigger Problem:

In some instances, the trigger of the Glock 20 Gen 4 may encounter issues that affect its functionality.

While the gun generally functions well with regular loads, it may face challenges with resetting when using hotter loads.

This can occur due to a spring shift or a misalignment in the trigger assembly, causing the trigger to fail to reset properly.

When the spring shifts to the side, it can rub against the housing and impede the trigger bar’s movement. It results in an unreliable reset.


To address the trigger issue, it’s essential to make adjustments to the spring.

  • Begin by disassembling the pistol carefully to access the trigger mechanism.
  • If the spring has shifted to the side, reposition it to the center using a thin tool like a small paring knife.
  • Gently push the spring towards the center from the rear edge, allowing it to reset properly.

This realignment ensures that the trigger functions correctly, enhancing the overall performance of the firearm.

5. Ejector Issue:

The ejector in Glock 20 Gen 4 serves a crucial role in extracting spent casings from the chamber during firing. However, users have reported instances where the ejector fails to perform its duty. It causes spent casings to become stuck inside the chamber.

This malfunction can render the firearm temporarily inoperable and pose a significant inconvenience. This is especially true in critical situations. The common causes of this issue are wear and a lack of maintenance. They impede the ejector from functioning correctly and prevent proper firing.


For a solution, it’s essential to approach the problem systematically.

Begin by disassembling the firearm carefully, paying close attention to the ejector mechanism.

Inspect it for any signs of being bent, corroded, or worn out, as these issues can hinder its performance.

If the ejector shows signs of damage, it’s crucial to replace it with a new one.

Afterward, thoroughly clean the surrounding area to remove any accumulated dirt or debris that might be causing the issues.

Apply a small amount of lubricant to ensure smooth operation of the ejector mechanism.

Once the maintenance is complete, reassemble the firearm and test its functions to verify that the ejector is operating correctly.

6. Stovepiping Issue:

Stovepiping is a frustrating occurrence, where spent casings fail to eject properly. It potentially causes misfires or jams.

Several factors contribute to this issue, including a weak recoil spring, dirty or unlubricated weapons, and damaged extractor or ejector components. Owners of the Glock 17 may also encounter similar glock 17 problems.

A weak recoil spring may lack the necessary force to eject spent casings properly. It led to stovepiping. Regular maintenance, such as replacing worn recoil springs, is essential.

Furthermore, keeping the weapon clean and properly lubricated prevents issues with slide operation.

Lastly, inspecting and replacing damaged extractor or ejector parts helps maintain reliable firearm function. This reduces the occurrence of stovepiping.


Addressing the stovepiping issue requires a systematic approach. Begin by inspecting the recoil spring to ensure it provides the necessary force for proper ejection.

If it appears worn or weakened, replace it promptly to restore reliable firearm function.

Additionally, thoroughly clean and lubricate the firearm to facilitate smooth ejection. It reduces the likelihood of spent casings becoming lodged in the chamber.

Another crucial step is to examine the extractor and ejector components for any signs of damage or wear.

These parts play a pivotal role in guiding spent casings out of the chamber.

If any components are found to be damaged or compromised, replace them to maintain optimal firearm performance.

7. Jamming Issue:

Jamming is a frustrating problem that can disrupt the function of your Glock 20 Gen 4. When your firearm fails to fire properly, it can be attributed to various factors. These include dirty components, damaged magazines, or poor maintenance practices.

One common cause of jamming is the use of weak or unreliable ammunition. It can lead to malfunctions during operation.


Begin by disassembling your firearm and cleaning it meticulously.

Ensure all components are free from dirt and obstructions, especially paying attention to the magazine. It can often be a source of the issue.

Check for any damage and make sure it is fully seated during assembly.

Lubricate all moving parts with appropriate gun oil to facilitate smooth operation. This step is crucial in preventing friction that might contribute to jamming.

Additionally, consider experimenting with different ammunition brands to find the ones that best fit.

8. Heavier Trigger Pull:

One of the issues that Glock 20 owners may encounter is a heavier trigger pull. This can be a concern for those accustomed to smoother triggers.

The trigger mechanism in high-caliber firearms like the GLOCK 20 may develop a heavier pull over time. It can impact the overall user experience and accuracy.

A heavier trigger pull might require additional effort from the shooter and could potentially impact the consistency of their shots.

Therefore, owners need to be aware of this aspect of the Glock 20 and take appropriate measures to maintain and possibly improve the trigger mechanism’s performance.


For a solution, it’s imperative to ensure that the firing pin is straight and properly aligned to prevent primer bulges.

Opting for high-quality ammunition helps avoid rounds prone to bulging or deforming.

Moreover, regular maintenance is essential. By cleaning the trigger mechanism after disassembling the firearm and using a suitable gun cleaner and oil, you can effectively remove dirt and grime.

It ensures a smooth trigger action. By this, you can ensure a smooth shooting experience.

Tested Alternatives To Glock 20 Gen 4:

1. Glock 40:

Among the tested alternatives to the Glock 20 Gen 4, the Glock 40 stands out for its unique features and capabilities.

With its long barrel and oversized magazine, the Glock 40 offers excellent accuracy and impressive power. This makes it an ideal choice for hunting and long-range target shooting.

However, users have reported certain issues with the glock 48 problems.

The grip ergonomics ensure a secure hold and enhance the overall shooting experience.

Moreover, the Glock 40 is renowned for its reliability and performance. This makes it a reliable alternative to the Glock 20 Gen 4 for those seeking enhanced capabilities and versatility.

2. Springfield XDM 10mm:

Another compelling option among the tested alternatives to the Glock 20 Gen 4 is the Springfield XDM 10mm.

This powerful handgun offers impressive kinetic energy, making it suitable for both self-defense and range-shooting scenarios.

One of the standout features of the Springfield XDM 10mm is its comfortable and hand-fitting grip contour. It ensures a secure hold and an enhanced shooting experience.

Also, it boasts ambidextrous features and robust rails. It caters to the needs of serious gun enthusiasts who prioritize versatility and adaptability.

3. Magnum Research Desert Eagle:

For those seeking an alternative to the Glock 20 Gen 4, the Magnum Research Desert Eagle 10mm presents a compelling option.

Boasting a striking chrome finish, this firearm features a powerful gas-operated mechanism that ensures a smooth shooting experience with each round fired.

Its rugged design not only enhances durability but also offers versatility in various shooting conditions.

Moreover, the Magnum Research Desert Eagle 10mm is compatible with a wide range of accessories.

It allows users to customize and optimize their shooting experience to suit their preferences and needs.

My Final Conclusion:

When considering the Glock 20 Gen 4, several factors come into play.

Despite its gentle recoil and remarkable durability, the heavy weight of the firearm poses challenges. The extended barrel contributes to its exceptional ballistic performance, but it also adds to the overall bulkiness of the weapon.

However, it’s essential to acknowledge that the Glock 20 Gen 4 is a meticulously crafted firearm hailing from Austria.

In conclusion, the Glock 20 Gen 4 offers a unique blend of strengths and weaknesses. While its gentle recoil and remarkable durability make it a reliable choice for many shooters.

Ultimately, the decision to invest in this firearm depends on individual preferences and intended use cases.

My Friends Feedback:

The Glock 20 Gen 4 is a popular firearm with a sturdy build and high magazine capacity. Users love its 15-round magazine plus one in the chamber for ample firepower, textured grip, and a larger magazine release button for an enhanced shooting experience.

The G20SF variant is preferred for improved recoil handling. Friends report that reloading ammunition for the Glock 20 Gen 4 can be expensive.

While OEM barrels work fine, friends are advised against pushing ammunition beyond the recommended maximum loads. It can cause bulges or creases in the feed ramp area of the barrel.

The Glock 20 Gen 4 has occasional reliability issues, but it is still popular among gun enthusiasts.

Discussions often compare generations and delve into practical modifications like installing a pyramid trigger.

Common Questions Asked About Glock 20 Gen 4

Is the Glock 20 reliable?

The Glock G20 Gen 5 MOS is simple, reliable, and shootable. The Gen 5 improvements have made it even better

Does the Glock 20 jam?

It does not jam all the time, maybe once every mag or every 2 mags.

Can you fire .40 from a Glock 20?

Technically, yes, as the 40 S&W is just a short casing 10mm however you should never do that.

What is the difference between a GLOCK 20 and a Gen 4 GLOCK SF?

The primary differences between the GLOCK 20 and the Gen 4 GLOCK 20 SF lie in grip size and customization.

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