30+ capacity mags looking for a forever home

What’s not to love about higher-capacity magazines—more is better, right? Who doesn’t want an extendo clip…or ten?

Especially when you’re out there on the range having a blasting good time. You can shoot longer between reloads, and heck, they look cool too.

Does Glock make extended magazines?

In short, yes.

“Glock offers factory extended magazines for their 40 S&W and 9mm magazines. Glock OEM magazines also offer the most customization overall. You can add a vast amount of different baseplates and followers to an OEM mag, something you can’t do with lots of aftermarket mags.”  -Travis Pike.

So, if you’re looking for a “high capacity Glock magazine” (say, 30 rounds or more), we have several higher capacity Glock magazines, aka Extendos at GunMag Warehouse and they’re looking for forever homes!

Below, you’ll find information and videos about the extendo clip options that we have available at the warehouse.

To assist you in your choices, we’ve compiled information about these mags into this guide. Our boy Daniel even made some videos to show them to you from 33-round OEM mags to 40-round ETS after-market extendos.

ETS colored Glock extended magazines.
ETS extendo clips come in different sizes, colors, and of course calibers (though the most popular are of course for Glock 9mm models.)

OEM Mags

These first two videos are about the Original Equipment Manufacturer (OEM) Glock Gen 4/5 33-round factory 9mm magazines. OEM means that they were made by another company for Glock to meet Glock’s quality and standards.

Of all the 33-rounders out there, Daniel says this is the most reliable for your handguns or pistol caliber carbines.

Combining impact-resistant polymer with tough steel inserts and steel springs, it’s an all-around great magazine with the sturdy construction that you expect from Glock.

This high capacity Glock magazine fits Glock 9mm pistols from Gen 3 to Gen 5. You can even use it to feed a Glock 26, but it’s going to stick out just a little bit (you think?) But hey, this probably isn’t something you’re going to conceal.

Custom Full Auto @Glockinc 19 done up by @boresightsolutions with 33-round extended magazine.
Custom Full Auto @Glockinc 19 done up by @boresightsolutions with 33-round Glock OEM extended magazine.

It has witness ports on the back to tell you how many rounds you still have in the magazine.

High Capacity Glock Magazine Gen 4/5 33-round 9mm OEM, witness ports on the back.
Be aware that even though this mag says 31 at the bottom, the +2 extension brings the capacity to 33 rounds.

This Glock extended magazine fits all double-stack 9mm models including  17, 18, 19, 26, 34, 19x, and 45 pistols.

This extendo clip is available in three color options. Take a look at the black one:

If you prefer Olive Drab Green (OD) or Flat Dark Earth (FDE) GunMag’s got you covered. Daniel prefers OD, saying, “OD is life to me!”

Glock 33 round magazine, OEM, 9mm in FDE and OD with High Visibility Orange Followers
The OD and FDE colored models come with a high visibility orange follower to help you gauge how many rounds are left in the mag with a quick glance.

Again, these are 31-round capacity Glock OEM factory magazines with a +2 extension, which takes them to 33 rounds. Check them out in the video below:

They run great and feed the gun the way it’s supposed to be fed.  All around great construction, great quality you expect from Glock.

Glock 9mm Luger magazines are duty-tested and combat-ready—trusted by law enforcement and military professionals from all around the globe. They are designed to drop free and provide ultra-reliable performance in any situation and they come with a very strong spring right from the factory to ensure reliability in the toughest of conditions.

Sometimes, magazines are found to be a little bit difficult to load at first. We recommend using a magazine loader to ease the loading process. However, after a few times loading and unloading, the springs break in nicely and it becomes much easier to load.

After Market High Capacity Glock Magazine Options

Besides the OEM mags, GunMag Warehouse also offers several aftermarket high capacity Glock magazines.

Generally speaking, aftermarket magazines have a polymer construction, which makes them more affordable than OEM magazines. But that doesn’t mean they aren’t worthy of consideration. Today’s polymers are pretty darn tough, and on the off chance that something does happen to your after-market magazine, these mags come with some incredible warranties.

Elite Tactical Systems 22-Round 9mm Glock Magazines

This magazine fits the Glock 26, 17, 19, and 34, and is compatible with Gen 1 through Gen 4 Glocks. You can also use it with a Glock 45 but a little bit of the magazine is going to stick out the bottom. Hey, some people are into that!

And, beyond the extra capacity that these mags offer, they’re made in the USA, with an amazing warranty. If this magazine gets destroyed somehow, the folks at ETS don’t care how it happened. Just send the pieces back to them, and they’ll send you a new magazine. You just can’t beat it out there in the magazine game.

Not a Glock 30 round magazine but still higher capacity. Elite Tactical Systems 22-Round 9mm Glock Magazines
This 22-round 9mm Glock magazine by Elite Tactical Systems is a 22-round capacity magazine for 9mm Glocks.  It’s drop-free as always because it’s an Elite Tactical Systems magazine.


  • Competition Legal 140mm (141.75mm)
  • Compatible with Glock and aftermarket floorplates
  • Easy disassembly with our specially designed baseplate
  • Ergonomically designed floorplate makes it easy to grab from mag pouches

Works great. All-around great magazine. Can’t beat it out there on the range practicing, training. Awesome warranty.

Magpul PMAG Glock 27 GL9 9mm 27-Round Magazine

These PMAG GL9 magazines offer enhanced capacity for double-stack 9mm Glock pistols and compatible carbines—Glock 17, 19, 26, and 45 (that’s Glock 45, not the caliber).

Magpul Glock Extendo clips
These extendos are designed to meet the same strict standards as factory Glock magazines for superior quality and reliability.

Regarded as the gold standard for polymer combat magazines, Magpul PMAGs combine rugged, lightweight construction with solid all-weather performance.

Magpul Twenty-One and Twenty-Seven Round 9mm Extendos
There are a lot of magazine options on the market, but Magpul is one of the top-quality selections out there.

These mags have a high-visibility follower and a marking matrix on the bottom. Witness ports let you see how many rounds you’ve got left in the mag and allow dirt and debris to escape.

Like most extended Glock magazines, they’re made with especially stiff springs, which might make them difficult to load the first few times. If you run in to this, consider using a speed loader or leaving them half-loaded for a few days to “break in” the springs.

Magpul stands behind each of their products to ensure they perform as promised for the duration of their service life.

Elite Tactical Systems Glock 18 9mm 31-round Extended Magazine

These magazines fit pretty much all of your 9mm Glocks out there. Made with advanced, ultra-robust polymer, these iconic translucent mags offer you instant at-a-glance ammo checks.

We’ve got them in three color options: clear, blue, and in our exclusive GunMag Red for Glock 17, 18, 19, 34, and 26 pistols in 9mm. Complete with ergonomic baseplates, they’re designed for easier handling and lightning-fast reloads.

Blue, clear, or GunMag Red, these 31-round 9mm Glock magazines Elite Tactical Systems magazines are one of our top sellers at GunMag Warehouse, and for good reason.

They’re 31-round capacity!

That’s a lot of bullets in your gun and a lot of fun to be had. If you destroy this high capacity Glock magazine in some way, ETS really doesn’t care. They’re either going to fix it for you or send you a brand new magazine.

Now, they’re going to ask questions. When Daniel asked them about the warranty, they said, “Yeah these magazines don’t break often so we’re going to figure out what happened. But we’re going to take care of it no matter what.”

Let’s take a closer look a the color options.

Translucent Blue

This Glock 18 magazine from Elite Tactical Systems, you may notice, is not your normal Glock 18 magazine. It’s a 31-round extendo clip for feeding hungry double-stack 9mm Glocks, and it’s blue.

Glock 30 round magazine? No, better than that. 31-round 9mm Glock magazines Elite Tactical Systems blue magazine
Daniel personally digs this color, “But it may not be the color for some of the baby bluemers out there.” See what he did there?

We’re guessing that plenty of other people will probably dig this color in their gun. It’ll look great for Instagram and all that good stuff.

Daniel says he’s “…tried a lot of magazines out there, some of them were good some of them were not so great. Some of them just straight up blew, but the ETS does not. They are blue but it does not blow. I’ve been shooting ETS magazines for quite a while. The Glock 18 kinda blue me away.”

They’re great magazines with the same great ETS warranty mentioned above. You can feed your double-stack 9mm Glock until you are blue in the face.

All puns aside, if you break this magazine for whatever reason ETS is going to take care of it for you and you’re going to have a great time shooting this thing.

Pick it up, take pictures, put it on Instagram, and tag GunMag Warehouse because it is a blue high capacity extendo clip and we know how much you like those colored magazines.

Don’t Like Blue? How About Clear or Our Exclusive GunMag Red?

These are better than a Glock 30 round magazine. Elite Tactical Systems 18 9mm 31 round extended magazine in GunMag red and clear.
These are better than a Glock 30 round magazine.

Whichever color you choose, these 31-round mags are made with Elite Tactical Systems’ revolutionary advanced polymer. So, they’re resistant to cracking & breaking and they have radical new features like an integrated coupling system.

ETS Glock magazines are designed to function with ALL generations of double-stack Glock pistols (Gen 1-5), they’re made in the USA, and don’t forget….they’ve got an incredible worry-free Lifetime Guarantee.

So double down on your firepower today with a few of these extended Glock magazines from ETS!

ETS 32 round mags, one empty and one loaded.
Update Oct. 2021: ETS announced a new high capacity Glock magazine that’ll give you another round with the new ETS 32rd GEN 2 mag. It is compatible with Glock 17, 18, 19, 19x, 26, 34, and 45.

KCI Glock 17, 19, 26, 34 9mm 33-Round Polymer Magazine

The KCI Glock 17, 19, 26, 34 9mm 33-round polymer magazine is designed for use with the Glock Gen 3 or later. It won’t work with your single stacks, obviously.

They’re awesome to have out there in your range bag for training and practicing with your pistol caliber carbine or Glock handgun.

Built with the same polymer and steel design as factory Glock magazines, these offer a high-value alternative to expensive OEM Glock magazines. They’re perfect for rough use, tactical drills, and any other application that might put aggressive wear on magazines and equipment.

KCI Glock 17, 19, 26, 34 9mm 33-round polymer magazine
These KCI mags are one of the least expensive ways to have fun out there, and you’re going to save a lot of money with them.

Like many new extendos, these might be difficult to load at first, and it’s possible they’ll need to be loaded and reloaded a few times before accepting full capacity. Consider using a magazine loader to make it easier and faster and remember that they’ll get easier to reload after multiple loadings.

What a great time for a little amount of money. You should go buy ’em all right now at GunMag Warehouse.

Elite Tactical Systems Glock 18 9mm 40-Round Extended Magazine

This transparent 40-rounder is a big magazine for having fun out there plinking on the range. It’ll work in your double-stack 9mm’s, and would also be a great extendo clip to run with your Glock magazine-fed pistol caliber carbines.

And, the ETS Glock 18 9mm 40-round extended magazine is constructed with the same advanced polymer as the 31-round ETS magazines above.

Elite Tactical Systems 9mm 40-Rd Extendo clip
It’s going to print just a little bit if you try to carry this thing concealed.

Ammo checks are simple, since the mag is translucent, and the ergonomic baseplates help make for lightning-fast reloads.

Remember, ETS has one of the best warranties out there in the game. If this extendo clip gets destroyed for whatever reason, they’re going to take care of it for you.

Awesome choice, 40 rounds of 9mm feeding that gun. Good times all day long. Buy… like… ten of them!

GunMag Warehouse ETS 18 9mm 40-round extendo clip
Everyone needs some transparency in their life.

What is an extendo clip?

An “extendo clip” is an extended magazine. It’s a slang term that often refers to a magazine of 30-round capacity or greater.

We define it as any magazine that now holds a significantly greater larger amount of ready ammunition than the weapon it’s intended for could originally hold.

An extendo clip is the an extended magazine. It is a slang term.

"Extendo clip" is slang for an extended magazine.

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Author: Joey Webster

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