One of the super cool things about 300 Blackout is that you only need a 300 Blackout barrel to convert your AR-15 to 300 Blackout. Your receiver set, magazines, and bolt all stay the same.
So many of the best 300 Blackout magazines are also the best 5.56mm/.223 magazines (there’s an outlier or two). That’s actually good news because you can increase your stockpile of 5.56mm magazines while you add 300 Blackout magazines to your collection, for no extra cost.
SPOILER—if you’re here to get 300 Blackout magazines rather than read about magazines, get the Magpul PMAG 30 AR 300BLK Gen M3. It’s pretty much the only AR-15 magazine that’s built specifically for 300 Blackout. So it performs amazingly well.
If you’d like magazines that also work with 300 Blackout and 5.56mm, keep reading. We’ve got all the best 300 Blackout magazines, so you can choose the best one.
Top 300 Blackout Magazines on the Market Today
The Best 300 Blackout Magazines Reviews: Magazines for All Your Rifles
The overall best 300 Blackout magazines are up first. The other best 300 Blackout magazines will be evaluated in order of price.
Budget friendly 300 Blackout magazines are up first.
Budget busting magazines are near the end.
Read the reviews that meet your budget needs.
1. Magpul PMAG 30 AR 300BLK Gen M3 - Overall Best 300 Blackout Magazine
The Magpul PMAG 30 AR 300BLK Gen M3 is one of the only magazines on the market that’s built specifically for 300 Blackout. That comes with quite a few benefits, but at least one drawback, that I can think of.
This is essentially a Magpul PMAG. The exterior dimensions are exactly the same as the 5.56mm model.
Additionally, it’s got the same flared base plate that you get on a standard Magpul PMAG. And the texture is the standard Magpul box texture.
So you won’t even notice the difference between this magazine and the 5.56mm magazines that you’re used to.
As the name suggests, it’s a 30-round magazine.
The only thing that separates this magazine from the 5.56mm variant is the internal geometry. This magazine fills the space around the casing and the bullet that’s left empty when you use a dedicated 5.56mm magazine.
The tighter geometry stabilizes the rounds for more reliable feeding. So you get more reliable operation than you get even from solid 5.56mm magazines.
The only downside to this is that this magazine looks very similar to a Magpul 5.56mm magazine. There is a 300BLK marking. But it’s subtle. You may want to mark these magazines to prevent any confusion.
Also, this is obviously not compatible with 5.56mm ammunition. So you don’t get the multi-caliber benefit of a standard AR-15 magazine.
But, this is a reasonably affordable magazine. And it actually works better than simply using a standard AR-15 magazine.
2. Hera Arms H3T Polymer Magazine - Value 300 Blackout Magazine
The Hera Arms H3T Polymer Magazine is probably the best super affordable magazine on the market. There are other magazines that have similar price points. But many have issues that are associated with budget equipment.
However, these magazines are super affordable. And they run reliably.
They also have a window that enables you to see roughly how many rounds are in your magazine.
Additionally, these magazines are equipped with an anti-tilt follower, which keeps your rounds feeding reliably.
There’s no flared base plate. And the exterior is a bit smooth. Now, you can still easily get a secure grip on these magazines. But the texture could be more aggressive.
Lastly, these are dedicated 5.56mm magazines. This enables you to take advantage of the flexibility of 300 Blackout.
In any case, if you need affordable 300 Blackout magazines, these Hera Arms are your best bet.
3. Hexmag LLC. AR-15 Series 2 30-RD Magazines - Budget 300 Blackout Magazines
The Hexmag LLC. AR-15 Series 2 30-RD Magazines are quite affordable. And they look super cool. But they’re not entirely perfect. There’s a lot to like, though.
First, these magazines are fitted with a high-visibility, anti-tilt follower. This helps keep the rounds aligned for reliable feeding.
On the outside, the Hexmag texture provides excellent grip. It’s one of the best magazine textures on the market.
Additionally, there’s a flared base plate for a more secure grip and faster reloads. Overall, the ergonomics are great.
Where these magazines show their price point is in the quality control. When these magazines work, they work great.
However, there are instances of shooters getting magazines that are out of spec, and therefore they have function issues. But it’s relatively easy to get your magazines replaced under warranty if you have issues with them.
Just check your Hexmags before you put them in your duty kit.
4. Magpul AR-15 30RD PMAG Gen M2 MOE Magazine - Polymer 300 Blackout Magazine
I know, I know. Most 300 Blackout magazines are polymer these days. But the Magpul AR-15 30RD PMAG Gen M2 MOE Magazine is one of the original polymer magazines. And, since this is the older generation of PMAG, it’s quite affordable.
But it’s got most of the same features that you get from the newer PMAGs.
The texture is the same as the newer PMAGs. The box style texture gives you secure grip for rifle manipulations.
However, it doesn’t have the pronounced magazine well tabs that the newer PMAGs have. It’s not a huge issue, though. Your magazine catch keeps the magazine from overseating, anyway.
It’s also got Magpul anti-tilt followers for reliable feeding.
And it’s got the flared base plate that makes it easy to hold onto during reloads and other manipulations.
The only downside is that these magazines have no window. You can get these magazines with the sight window: Magpul AR-15 30RD PMAG Gen M2 MOE Window Magazine. But they cost a few dollars more. So they’re not quite as good of a deal.
In any case, these Magpul mags are excellent polymer magazines. And you can get them for reasonable prices because there’s a newer model available.
5. Lancer Systems AR-15 L5AWM 30RD Mag - Hybrid 300 Blackout Magazine
The Lancer Systems AR-15 L5AWM 30RD Mag are one of the few magazines on the market that use both polymer and steel to maximize the lifespan and promote smooth feeding. It might be the only hybrid magazine on the market. But don’t quote me on that.
Anyway, this magazine uses a steel sleeve around the top of the magazine to give you steel feed lips. The steel feed lips are coated to reduce corrosion, that way they’re almost as weather resistant as the polymer body.
Additionally, the base plate is a slide-on plate that makes it super easy to disassemble your magazines for maintenance. The base plate is also flared and rubber coated to give you the best grip for rifle manipulations.
The texturing also helps a lot with grip during rifle manipulations. It’s even a bit better than the Magpul texturing. It works very well.
The main downside to these magazines is actually the steel sleeve. It’s durable. And the polymer body reinforces the steel feed lips to prevent warping. However, they are still prone to warping over time.
But, the steel feed lips feed super smoothly. And the polymer body is durable and super easy to handle. These might have a bit of the Achilles Heel that steel mags have. But these Lancer Systems models are still great 300 Blackout magazines.
6. Magpul AR-15 30RD PMAG Gen M3 Window Magazine - 300 Blackout Window Magazine
The Magpul AR-15 30RD PMAG Gen M3 Window Magazine is just the most up-to-date PMAG with a window. If you’re familiar with PMAGs, much of this review will be redundant.
The body is textured polymer. It’s the same box texture that you get on any other PMAG. It works great and gives you a secure grip.
The window enables you to see just about how many rounds you have in the magazine. And the window has venting holes. So your magazine drains if you’re operating in wet environments.
Additionally, this magazine has the M3 body, which has magazine stops to prevent over seating if your magazine catch doesn’t snap into place fast enough.
Lastly, the base plate is flared to give you better grip and control over your magazines during rifle manipulations.
Now, magazines aren’t super expensive, objectively speaking. However, these magazines are not budget magazines.
But, they’re definitely the best option if you want polymer window magazines.
300 Blackout rifles and pistols are super cool. They suppress really well. The 300BLK round is excellent for short and medium range applications. There’s a lot to love about the 300 Blackout.
And, if you have a really cool rifle, why not feed it with the best 300 Blackout Magazines you can get?
If you want great 300 Blackout magazines without much fuss, get the Magpul PMAG 30 AR 300BLK Gen M3. It’s built specifically for shooting 300 Blackout. And this magazine is essentially just a Magpul PMAG. So the ergonomics are the same as you’re used to.
It wasn’t any secret before. But, now that you know even more, ditch those USGI magazines. And upgrade your 300 Blackout setup.