Glock 40 Problems You Must Know

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Hey folks, Welcome To My Glock 40 Problems Blog

I’m here to talk about my firsthand experience with the Glock 40. I’ve taken it out for quite a few spins, and while it’s an impressive piece of hardware, it’s not without its issues. 

I noticed a few recurring Glock 40 Problems that need some attention. We’re talking about feeding issues, aiming inconsistencies, magazine hiccups, MOS complications, and even rapid wear and tear. Yeah, it’s a bit of a mixed bag.

But don’t worry, I’ve got you covered. I’m going to dive deep into each of these issues, unpack what’s going on, and give you practical solutions to get your Glock 40 running smoothly as silk. 

here’s a quick reference table summarizing the top 5 Glock 40 problems and their respective solutions:

Feeding ProblemClean and polish the feed ramp; consider replacing the gun if the problem persists.
Aiming ProblemAdjust sights to the right, consider replacing the barrel with something like a KKM barrel, or consider a new gun.
Magazine IssueRotate magazines to find the best fit, avoid pressing against the exposed tube, consider replacing springs.
MOS ProblemSwitch to a scope with crosshairs for better long-range accuracy.
Fast Wear & TearSwitch to a more durable 9mm model or replace the barrel after a certain period; regular maintenance is crucial.

Top 5 Glock 40 Problems & Solutions

1. Feeding Problem

So, let’s talk about this pesky “failure to feed” issue. It’s something I’ve come across, and let me tell you, it can throw you off. I’d call it a “soft jam,” meaning you can get the round to feed by pulling and releasing the slide. 

The slide locks back on empty without fail, which is good. Also, the fired brass looks clean; no drag marks or pressure issues. But what gives, right? You’re out there, you’re ready, but then, uh-oh, a misfeed.


Look, I’ve tried swapping out ammo, messing with different magazines, and even checking the springs. Sometimes, that clears up issues with other guns, but not with this one. It might actually be the gun itself; who knows? 

Here’s what worked for me: Give the gun a thorough cleaning, polish up the feed ramp, and try it again. I found out that small imperfections on the feed ramp could be the culprit. So a little polish job, and we’re back in business. 

If that doesn’t fix it, you might be looking at a lemon, and it might be time to consider a replacement. Trust me, I’ve been there, and it’s frustrating, but sometimes that’s the last resort.

2. Aiming Problem

Alright, let’s get into another issue I’ve bumped into: aiming. I’ve noticed something off, especially when I’m trying to keep my groups tight. 

It’s not just the MOS causing inaccuracies; the gun itself is sort of biased against all types of ammo. The shots drift, either to the left or right, messing up the whole alignment. 

And I get it; it’s got a long barrel, but I’ve seen other long-barreled guns outperform this one. The large frame only makes the issue more glaring.


Here’s what you can do, and yes, I’ve tried this. Start by adjusting the sights. Move them all the way to the right to center the point of impact. If you’re not thrilled about that, you can also replace the barrel with something like a KKM barrel. 

That did make a noticeable difference for me. Worst case, if drifting the rear sight just doesn’t sit well with you, you might want to look into buying a new gun altogether. 

I hate to say it, but sometimes you hit a wall, and the manufacturer might only offer to adjust the rear sight for you.

3. Magazine Issue

Okay, let’s get down to yet another annoyance: magazine issues. Man, I’ve had all sorts of malfunctions, ranging from failure to feed to the magazine not going into battery and even extracting and ejecting issues. 

Talk about a disappointing day at the range. It seems the 22-round magazine is particularly finicky, adding another layer of complexity.

I even noticed the issue can be exacerbated if you press your hand against the exposed tube portion while firing.


Here’s the thing: I experimented a bit and found some solutions that made a difference. First off, if you’ve got issues with the 22-round magazine, try switching it out for a new one. Keep rotating until you find the perfect fit; that’s what I did. 

Another tip? Stop pressing your hand against the exposed part of the tube while shooting; it actually makes a difference. And don’t overlook the spring; a weak spring can mess things up, too. I swapped mine out, and the issue was almost gone. 

If you’re still on the stock magazine, maybe get a new spring for it. It’s an easy fix that can make your shooting experience way better.

4. MOS Problem

When I tried taking shots at 50 yards, the lock-up felt inconsistent, making the target seem more like a gamble than a sure thing. 

You’d think a barrel this long would mean good accuracy, but think again. Because of the leverage against the locking surfaces at the front, it’s just not happening. 

Honestly, the Glock 40 falls short in its potential for long-range accuracy due to that unsupported front.


So, how to get around this mess? From my experience, if you’re aiming for really small groups, your best bet is to switch to a scope with crosshairs. 

I tried both dot optics and crosshairs, and let me tell you, crosshairs made all the difference for those longer shots. If you’re using a 3 mil dot, you might still manage some good groupings. But go beyond 5 mil, and it’s like shooting at the side of a barn. 

Switching to crosshairs for those 50-yard shots did wonders for me. It could be the game-changer you’re looking for, too.

5. Fast Wear & Tear

So, let’s get to one of the most concerning issues: the Glock 40’s fast wear and tear. No joke, this bad boy shows signs of degradation quicker than its 9mm counterpart. 

The S&W frames simply can’t handle the high-pressure rounds for long; they’re just not up to the task. Add to that the weak barrels, and you have a recipe for disappointment. 

Trust me, I’ve seen the signs, and it’s a bit unsettling how quickly the wear shows up.


Alright, here’s the scoop on how to keep your Glock 40 from wearing out too fast. For starters, you could think about switching to a 9mm model; they’re more durable in the long run. 

I tried that, and I can say it’s a relief on the maintenance front. Another option is simply replacing the barrel after a certain period. 

That’s what I did after noticing the wear, and it did help. Now, if you’re in law enforcement, getting a new gun isn’t usually a big deal. But either way, remember, proper maintenance is key. 

A well-kept Glock will serve you longer, no matter the caliber.

Find: Best Red Dot Glock 40 MOS

Alternatives to Glock 40

1. Smith & Wesson M&P40

If you’re facing ergonomics-related problems with the Glock 40, take a gander at the Smith & Wesson M&P40. Known for its comfortable grip and easy handling, this could be the fit you’re looking for.

2. SIG Sauer P320

Struggling with aiming issues? Check out the SIG Sauer P320. Its modular design lets you customize the gun, and many users rave about its accuracy and smooth trigger pull.

3. Walther PPQ M2

If you’re concerned about rapid wear and tear, the Walther PPQ M2 might be your go-to. Not only is it known for its durability, but it also offers a smooth trigger system that could be just what you’re missing.

4. CZ 75 SP-01

For those leaning towards a more classic design, the CZ 75 SP-01 has a lot to offer. Its all-metal construction means it’s heavy but durable, and that extra weight might help you manage recoil better.

5. Heckler & Koch VP40

This one’s a winner if you’re looking for a balance of durability and ergonomics. The Heckler & Koch VP40 has a customizable grip, and its accuracy gets high marks from many users.

Final Verdict

There you have it, folks. I’ve dived into some of the more noticeable problems I’ve encountered with the Glock 40, like feeding issues, aiming inconsistencies, MOS problems, and even rapid wear. 

Now, don’t get me wrong; despite these shortcomings, the Glock 40 has its merits, notably its power and adaptability. If you’re willing to put in a little elbow grease, you can turn this pistol into a reliable piece of hardware. 

Whether it’s polishing the feed ramp, adjusting your sights, or swapping out barrels, these are workable solutions. 

Proper maintenance is a big part of this; take care of your gun, and it’ll take care of you. Even with its issues, a well-maintained Glock 40 can offer a robust and dependable shooting experience.


What is the effective range of a Glock 40?

I’ve found the effective range of the Glock 40 to be primarily up to 50 yards, although it can be used in specific situations up to 100 yards.

What’s better Glock 40 or 45?

When considering magazine capacity, the Glock 40 is superior, holding 15 rounds of .40 S&W compared to the Glock 21’s 13 rounds of .45 ACP.

Can a Glock 40 stop a bear?

Yes, a Glock 40 with a minimum 200-grain solid deformable bullet and a minimum velocity of 1,000 fps can potentially stop a bear.

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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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