4 Glock 21 Problems You Should Be Aware of

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Glock 21 is a robust gun known for its reliability and power, but it’s not without challenges. 

Throughout my time using it in various conditions, I’ve stumbled upon a few recurring issues that seem to pop up more often than we’d like.

I know it might sound daunting, especially if you’re new to this model or firearms in general. But fret not! I’ve tackled these Glock 21 Problems head-on and have come up with some practical solutions that have worked for me and might just do the trick for you, too.

Trigger ResetReplace the trigger spring and connector for a more responsive reset.
Brass to FaceSwap out the ejector with a compatible part to ensure consistent ejection patterns.
Cycling IssueUse high-quality ammunition and ensure the firearm is clean and well-lubricated.
Feeding IssueCheck ammunition compatibility using the barrel as a gauge; replace defective rounds.

Top 4 Problems & Their Solutions

1. Trigger Reset Issue

The trigger reset issue in the Glock 21 is something that caught my attention during my sessions. 

After pulling the trigger, it’s supposed to spring back into its original position quickly, readying the gun for the next shot.

However, I noticed a lag or sometimes a complete failure in this mechanism. This issue means the trigger doesn’t quite ‘reset’ as it should, leading to delays in firing or requiring additional force to get the next shot ready. 

This problem can be a hassle, especially when quick successive shots are necessary. It seemed to stem from either a mechanical glitch in the trigger assembly or perhaps wear and tear affecting its components.


Addressing the trigger reset issue involved a bit of troubleshooting. 

I examined the trigger assembly for any visible signs of damage or excessive wear. Finding none, I proceeded with a detailed cleaning, thinking debris might be hampering the mechanism. 

When this didn’t solve the issue, I consulted with a professional who suggested replacing the trigger spring and connector. 

These are relatively inexpensive parts and are known to wear down over time, affecting the reset. After swapping these components, the improvement was noticeable. 

The trigger reset became crisp and responsive, significantly enhancing the shooting experience. 

This fix is something I’d recommend to anyone facing similar issues, as it’s both effective and doesn’t break the bank.

2. Brass to Face

Brass to face (BTF) is an issue where spent casings are ejected unpredictably, sometimes hitting the shooter in the face or head. 

While using the Glock 21, I encountered this problem more often than I’d liked. 

It’s not just a nuisance; it can be a safety concern, especially for new shooters or those wearing glasses. 

The inconsistency in ejection patterns led me to investigate, suspecting it could be related to the gun’s ejector or perhaps even the ammunition I was using.


After some research and talking to other Glock 21 users, I learned that replacing the ejector might be the solution. 

The ejector is a small yet crucial component that guides the spent casing out of the gun. Given its price of around $12, I decided it was worth a shot. 

The replacement process was straightforward, and the parts are indeed compatible across different Glock generations. 

Post-replacement, the difference was clear. Ejections became more consistent, with casings clearing away from my line of sight, never coming close to my face. 

3. Cycling Issue

During my time with the Glock 21, I encountered a cycling issue that was both puzzling and frustrating. 

The problem manifested as the firearm failing to cycle through rounds smoothly, leading to jams and less reliable shooting experience. 

This was particularly surprising given Glock’s reputation for reliability. I noticed that the issue was more pronounced with certain types of ammunition, suggesting that the problem might not solely reside within the gun’s mechanics but also involve the ammo used. 

Cycling issues can stem from a variety of factors, including the ammunition’s power, the cleanliness of the firearm, and even the condition of internal components like the recoil spring.


To tackle the cycling issue, I first made sure the gun was thoroughly cleaned and properly lubricated, as dirt or grime in the mechanism can impede functionality. 

However, the breakthrough came when I focused on the ammunition. I discovered that using different brands and types of ammo had a significant impact. 

By switching to higher quality ammunition, such as Federal and Fiocchi 230 grain, the cycling problems vanished. 

This experience underscored the importance of using good quality ammo that is compatible with your firearm’s specifications. 

4. Feeding Issue

A feeding issue arose the second time I took my brand new Glock 21 out for a spin. I was using PMC FMJ ammunition, and unexpectedly, the gun refused to feed one of the rounds. 

This incident was particularly alarming because I’ve used various Glock models without encountering such problems. 

The gun was clean and well-lubricated, which made the feeding issue even more baffling. It’s worth noting that feeding problems can severely affect a firearm’s reliability and performance, potentially making it unsafe in critical situations.


The solution to the feeding issue involved a simple yet effective method to determine the root cause: checking the ammunition’s compatibility with the gun. 

Without a chamber gauge, I field-stripped the pistol, removed the barrel, and manually checked whether the rounds were fully seated. 

This test revealed that some rounds did not fit properly, indicating a defect, likely in the ammunition’s crimp. 

By isolating and discarding these defective rounds, the feeding issue was resolved.

Alternatives to the Glock 21

1. Sig Sauer P320

Known for its modular design allowing for easy caliber and grip size changes, the Sig Sauer P320 is a versatile option. It’s highly accurate and has become a favorite among law enforcement and civilians alike.

2. Springfield Armory XD(M)

The springfield XDM series stands out with its exceptional ergonomics, high-capacity magazines, and match-grade accuracy. Its safety features and reliability make it a top choice for both competitive shooting and self-defense.

3. FNX-45 Tactical

Designed with tactical applications in mind, the FNX-45 Tactical comes equipped with a threaded barrel for suppressors, high-capacity magazines, and optics-ready slide. Its durability and precision make it ideal for both service and civilian defensive use.

4.Beretta PX4 Storm Full Size

The beretta PX4 Storm offers a unique rotary barrel system that reduces recoil and improves accuracy. It’s a versatile handgun with interchangeable backstraps and a 10 or 17-round magazine capacity, suitable for a variety of shooting needs.

Final Verdict

Having spent considerable time with the Glock 21, I’ve come to appreciate its robustness and reliability despite encountering some issues. 

The trigger reset, brass to face, cycling, and feeding problems initially posed significant challenges. 

However, these issues were resolved through practical troubleshooting and fixes, such as replacing parts like the ejector and using high-quality ammunition, enhancing the firearm’s performance. 

This journey has reinforced my confidence in the Glock 21 as a reliable firearm when properly maintained and used with compatible ammunition. 


What is the Glock 21 known for?

The Glock 21 is known for its accuracy, light recoil, and delivering the power of the .45 Auto round with high magazine capacity.

How many rounds can a Glock 21 shoot?

A Glock 21 has a standard capacity of 13 rounds in .45ACP.

What’s better Glock 19 or Glock 21?

The choice between Glock 19 and Glock 21 depends on preference; the G19 has higher capacity options and versatility, while the G21 offers .45 ACP power.

How heavy is a Glock 21?

A Glock 21 weighs 29.30 oz when unloaded.

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I'm Micheal, an avid shooter and hunting enthusiast from Texas. I'm a recreational shooter who loves to spend time at the range and enjoy learning about new firearms and gears. I love to write about guns and share my passion for shooting with others.

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