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Best Glock 21 Magazines [2025 Buying Guide]
Glock introduced its first pistol chambered in .45 ACP in 1990, serving as a direct competitor for the heavier but well-established 1911, which dominated the .45 ACP market.
Now, 34 years later, the Glock 21 is still at it and as popular as ever. In terms of size, it’s similar to the Glock 17 (chambered in 9mm), so it’ll feel familiar to many.
This pistol packs a punch. Source
Overall, it’s a lightweight .45 that has seen more service than Patton himself and is still serving in many places with law enforcement and military alike. So, if you own one, then you’re in luck. You got yourself a fine pistol.
Now you just need some spare mags to go with it.
Note: Glock 21 mags are interchangeable between Gen 3- 5, so you don’t have to worry about compatibility unless you own a Gen 1 or Gen 2.
Everyday Carry & Home Defense
Factory Replacement:
These factory magazines were tested and approved for use with your Glock 21, so you can rest assured that they are up to par and will work reliably.
They feature a durable polymer construction with full-length steel inserts, so durability will never be a concern. The anti-tilt polymer followers keep them running smoothly, and the rear-facing witness holes help you track how many rounds you have left.
From the range to home defense or any other application you can think of, these genuine magazines should be your go-to.
For Magazine Capacity Restrictions:
I know, living in a state where bureaucrats limit your capacity sucks, but if you live in an area like this, then you’re going to need some spares to keep up with the bad guys (who missed the memo for the capacity restrictions).
These 10-round magazines come straight from the factory like the ones above, so you know they are good to go. They share the same build quality and features; you’ll just need to grab a few more to hang from a capacity perspective.
Range
Now, we’ve entered the realm of extended magazines. They may offer a bit less versatility, but they make up for it in fun. These 26-round KCI magazines resemble your factory magazines, with the polymer body and steel inserts, but have black followers instead of orange.
SALE 
KCI .45 ACP 26 Round Extended Magazine for Glock 21, 30 Pistols
42 reviews
Original price was: $18.99.$15.99Current price is: $15.99.
Out of stock
They even have the rear-facing witness holes, which will come in handy with the additional rounds. Carrying these around would be extremely hard, but they are fun for the range. If you just bought a Glock 21, these can do a great job helping with the break-in period.
The largest stick magazine on the list, these ETS mags offer four more rounds than the previous KCI magazine! Translucent magazines have many purposes, but being able to see the amount of ammo you have left and their aesthetics are among the primary reasons why many people choose them.
ETS .45 ACP 30 Round Extended Magazine for Glock 21, 30 Pistols
46 reviews
Price range: $12.99 through $21.99
I’ve enjoyed using them on multiple occasions, and they just keep going and going. If any of these reasons sound appealing to you, the ETS translucent mag is for you.
ProMag is one of the foremost purveyors of the drum magazine, and I’ve had plenty of time to use them across different pistol platforms.
They work well and are built well. Constructed from an advanced polymer and featuring a steel liner, these drum magazines are meant to last.
Whether you’re breaking in your new pistol at the range or running one of these for home defense, you’ll have maximum capacity for your Glock 21.
Accessories
Everyone always wants more magazine capacity, right? This Pearce Grip extension mates to the bottom of your factory magazine to give you two additional rounds and extra real estate.
With the factory grip texture carried over from the Gen 3/4 Glocks, the extra finger space helps provide an extremely firm grip, which is important for those with big hands.
More control and capacity at such a great price is hard to beat.
One of the worst parts about visiting the range is how much reloading you must do. And how long it takes. And how much stress it puts on the joints of your thumbs.
Arthritis is real; it’s right around the corner for some of us. You can imagine how painful it will be to shoot when your most valuable finger is seized up, in terrible pain, and unusable until the flare-up subsides.
To mitigate this, the best option is to get a mag loader. It will reduce the time you spend loading and maximize the time you spend shooting.
SALE 
maglula UpLULA 9mm - .45 ACP Pistol Magazine Loader
1050 reviews
Original price was: $34.99.$29.99Current price is: $29.99.
And it may save you some pain in the future, too.
Conclusion
The Glock 21 continues to prove its worth. Given the opportunity, as it has over the past 34 years, it’s more than sufficient for anything life may throw at you (that a gun can solve, anyway).
Don’t forget your eyes and ears! Source
Whether you’re in the market for spares or replacements, these on the list are good to go. You’ll always want to ensure you have enough mags to handle any scenario, so don’t forget to add a few to the cart!
Be good and take care.
