Top 34 How Many 300 Blackout Rounds Fit In A 5.56 Magazine The 192 Latest Answer

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Will 300 Blackout rounds fit in a 5.56 Magazine?

You can use your 5.56 AR-15 magazines with 300 Blackout ammunition in a rifle chambered in 300 BLK, but magazines designed specifically for 300 Blackout can improve performance and cut down on common reliability issues.

Does 300 Blackout use the same magazine as 223?

300 Blackout uses a . 223 case cut down to accept the . 30-caliber bullet, meaning the bolt and magazine for a . 223 or 5.56 firearm would work for a .

What magazine do I use for 300 Blackout?

300 AAC is technically compatible with 5.56 magazines. You can run the . 300 Blackout through 5.56 magazines without issues. However, it’s always a good idea to use magazines specifically made for the caliber you’re loading on your rifle.

Can I put a 300 Blackout Upper on my 556 lower?

Standard 5.56 magazines will work with the 300 Blackout without issue, or even a loss of a round or two. The simple fact is, nearly every standard AR 15 part will work with 300 Blackout and that is the reason building 300 blackout is growing in popularity.

Is 5.56 and 300 Blackout the same?

In some cases, the 5.56mm bullet can pierce through armor, but that needs some extra amplification. The . 300 BLK, on the other hand, is a larger diameter round that is often slower but hits with more ft-lbs on target. The 300 blackout is also a much better round when it comes to suppressing.

Is a 300 Blackout an AR 15?

What is 300 Blackout? Officially called 300 AAC Blackout (designated 300 BLK by SAAMI standards), this round is a 7.62x35mm intermediate rifle cartridge. It was developed by Advanced Armament Corp (AAC) in 2009 to 2010 for the military’s M4 rifle. Today, many shooters and gun owners build AR-15s chambered in 300 .

Is there a drum mag for 300 Blackout?

223, 5.56, and . 300 AAC blackout, look no further. F5 MFG presents one of its finest and robust drum mags, the skeletonized 50 round drum magazine for your AR 15. This magazine also works with M16, an adapted rifle from AR15 with the same caliber. .

Does 300 Blackout work Pmags?

The PMAG 30 AR 300 B GEN M3 is a purpose-designed magazine for rifles chambered in 300 Blackout® (300 BLK).

Are all 5.56 magazines interchangeable?

223 and 5.56 Magazines the Same? Yes, the magazines for . 223 and 5.56 ammunition are identical. Since the rounds are identical on the outside, the magazines are completely interchangeable.


Quick Tip: Using .300 Blackout Mags in a 5.56 / .223 Rifle
Quick Tip: Using .300 Blackout Mags in a 5.56 / .223 Rifle


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5 Best Magazines for 300 Blackout [2021 Review]

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Can’t I Just Use My 556 Magazine with 300 Blackout

Best 300 Blackout Magazine Options

Conclusion

5 Best Magazines for 300 Blackout [2021 Review]
5 Best Magazines for 300 Blackout [2021 Review]

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NRA Blog | Avoiding the .300BLK AR-15 ‘ka-boom!’

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NRA Blog | Avoiding the .300BLK AR-15 ‘ka-boom!’
NRA Blog | Avoiding the .300BLK AR-15 ‘ka-boom!’

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Best .300 Blackout Magazines – Sniper Country

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Build Material

Build Quality

Ease of Ejection

Texturing

Review Your State Laws

D&H Industries AR-15 300 Blackout Magazine w Red Follower

Lancer Systems AR-15 L5AWM 300BLK Translucent Smoke Magazine

Brownells AR-15 Magazine 556

Special Consideration Surefire 60-Round High-Capacity Magazine

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Best .300 Blackout Magazines - Sniper Country
Best .300 Blackout Magazines – Sniper Country

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How Many 300 Blackout Rounds Fit in a Magazine

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How Many 300 Blackout Rounds Fit in a Magazine
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Capacity of .300 Blackout in 5.56/2.23 Mags – AR15.COM

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Capacity of .300 Blackout in 5.56/2.23 Mags - AR15.COM
Capacity of .300 Blackout in 5.56/2.23 Mags – AR15.COM

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5 Best Magazines for 300 Blackout [2021 Review]

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Can’t I Just Use My 556 Magazine with 300 Blackout

Best 300 Blackout Magazine Options

Conclusion

5 Best Magazines for 300 Blackout [2021 Review]
5 Best Magazines for 300 Blackout [2021 Review]

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300 Blackout Magazine Buyer’s Guide [2022] | Gun Made

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300 Blackout Magazine Buyer’s Guide [2022] | Gun Made
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NRA Blog | Avoiding the .300BLK AR-15 ‘ka-boom!’

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5 Best Magazines for 300 Blackout [2021 Review]

Can’t I Just Use My 556 Magazine with 300 Blackout?

You can use your 5.56 AR-15 magazines with 300 Blackout ammunition in a rifle chambered in 300 BLK, but magazines designed specifically for 300 Blackout can improve performance and cut down on common reliability issues. This is particularly true when using subsonic ammunition that is slightly longer and heavier, as these rounds tend to have more problems in 5.56 mags.

It should go without saying, but to be clear, never use 300 BLK in a rifle chambered in another caliber like 5.56 as this can lead to catastrophic failure. While you probably already know this, a great gun safety rule is to always designate and mark magazines specifically for 300 BLK to avoid accidentally loading them into the wrong rifle.

Best 300 Blackout Magazine Options

Here are our choices for the best 300 Blackout magazine options, specially designed for this cartridge:

1) Lancer L5AWM 300 BLK Magazines

Lancer’s L5AWM has been our choice for the best 5.56 AR-15 magazine in recent years, so we were thrilled when they launched a 300 Blackout line at 2018 shot show.

Avoiding the .300BLK AR-15 ‘ka-boom!’

by Jason J. Brown – Thursday, September 1, 2016

Spend any amount of time scouring gun boards and blogs and you’ll undoubtedly come across pictures, accounts and horror stories of the dreaded AR-15 “ka-boom!” caused by chambering the wrong ammunition in a rifle, resulting in shattered rifle receivers and shaken-up shooters.

Most frequently as of late, those ruined rifles are due to accidentally loading a magazine full of .300 Blackout into a .223/5.56-chambered AR-15, an easy-to-make but dangerous mistake that can have dangerous consequences. Take a look:

(Photo courtesy/Badger175 via Photobucket)

Or this…

(Photo courtesy/300BLKtalk.com)

This too…

(Photo courtesy/BearingArms.com)

Yikes.

It doesn’t need to be that way, however. Using the correct ammo for the firearm you’re shooting is an absolute must. By taking extra steps and attention to detail when loading your magazines and your firearm, you’ll be able to avoid damaging or destroying your gun due to chambering the wrong ammo.

A little background on the .300 Blackout round: With its earliest roots in gun designer J.D. Jones’ .300 Whisper wildcat cartridge, the 300 .AAC Blackout was created by Advanced Armament Corporation in cooperation with Remington Defense to provide a specialized .30-caliber round to meet the needs of special operators who wanted the performance of the .30-caliber projectile while using the equipment they already had, namely the M16 rifles and M4 carbine.

(Photo courtesy/40CG.com)

The .300 Blackout allowed users to simply retrofit a .30-caliber barrel to their rifle without making any other changes, as the .300 Blackout uses a .223 case cut down to accept the .30-caliber bullet, meaning the bolt and magazine for a .223 or 5.56 firearm would work for a .300 BLK round.

Therein lies the potential for misuse.

Always – ALWAYS! – visually inspect your rounds

If you’re anything like me, loading your magazines at the range can be a relaxing exercise in repetition, especially knowing you’re about to partake in some usually much-needed range time (we could all use more practice!). However, without ammo discipline, it’s way too easy to accidentally load a 300BLK round into an AR-15 .223 magazine – they’re DESIGNED to fit, after all.

If you even as much as own any .300BLK ammo and plan to load and shoot .223 or 5.56, it’s a prudent practice to visually observe the rounds you load into your magazines. Even though the parent case is the same and the rounds are the same length and diameter, you should be able to instantly distinguish the two rounds due to the difference in the size of the projectile.

Carefully observing each round you insert into your magazines will help you avoid mistakenly loading the wrong round into the firearm, in turn preventing a catastrophic failure and likely destruction of your rifle. This is particularly important, as you cannot rely on your firearm to tell you you’ve loaded the wrong ammo — the .300BLK cartridge will chamber in a 5.56 rifle, but in no way, shape or form should you ever try to fire it. The .22-caliber bore simply isn’t big enough to handle the .30-caliber projectile of the .300BLK round, and all that pressure from the round needs to go somewhere once the primer is struck.

As you can see, a .300BLK round will chamber in a .223 gun but under no circumstances will fire correctly. (Photo courtesy/OA2.org)

Labeling, coloring and separation

While you should always inspect the rounds you’re loading into your magazines, but another way to practice good ammunition discipline is to keep different calibers in separate containers that are clearly marked to describe what’s inside.

It may be bit cumbersome to drag multiple ammo cans or boxes to the range, but doing so could serve you well when it comes to staying safe on the firing line. Consider using different colored ammo boxes for different calibers, using paint, markers or stickers to label each with the caliber they contain, and maintain physical separation of the containers as much as possible.

(Photo courtesy/J & J Products)

Another good tactic is using different magazines dedicated to a specific caliber. For example, I used solely Magpul magazines for my 5.56 ammo, while opting for traditional metal magazines for my .300BLK rounds. The difference in appearance and texture can serve as a tactile reminder of what round you’re about to chamber.

Other shooters have used different colored magazines to differentiate between calibers, like loading standard black magazines with .223 and reserving flat dark earth mags for their .300BLK ammo. More subtly, some shooters adorn their magazines with colored tape to make the designation clear.

Some companies create labels or decals you can apply to your magazines that specify what caliber it’s used for, and even Ruger took the smart step of labeling its .300BLK magazines bundled with their .300 Blackout barrel kit for their SR-556 Takedown rifle.

(Photo courtesy/GunsAmerica)

Whatever method you choose is great as long as it helps you and fellow shooters recognize the differences and practice good ammo discipline.

One at a time

Perhaps the most drastic but effective way of avoiding catastrophe is to simply shoot one caliber per range trip. Sure, it may be overboard to limit yourself, especially if you can’t get to the range that often and want to take advantage of all your guns when you do, but only bringing one of the two calibers to the range – with the correctly chambered rifle, of course – seems a great way to prevent accidents from switching back and forth between calibers.

If you must take both calibers shooting and want a little extra peace of mind in addition to the above steps, consider securing your alternate calibers and firearms in a locker or storage area away from the firing line until you’re ready to use them. Doing so creates further delineation between 5.56 and .300BLK.

Observe and intervene

Even if you have all your ducks in a row and practice fail-proof ammunition discipline, that doesn’t mean everyone around you is as educated or dedicated. If you head to the range with family or friends and plan to bring both .223 and .300BLK, make sure they know the difference between to two, the dangers of accidentally mixing them up in the wrong rifle, and understand your system of differentiating between the two calibers.

Short of loading everyone’s magazines for them, it’s a good idea to observe others as they interact with the firearms, particularly inexperienced and younger shooters. Some might be annoyed or nervous by your attention, but it’s much better than the alternative of someone making a mistake that could lead to a broken rifle or worse.

(Photo courtesy/StuntGunner)

The .300 Blackout is an innovative cartridge that bridges the gap between intermediate calibers and full-power .30-caliber rounds, providing flexibility and performance in a familiar and lightweight package. Safety should always be your foremost concern on the range, and that definitely applies when using .300BLK and .223 together. A little discipline can go a long way in preventing a dreaded AR “ka-boom.”

Best .300 Blackout Magazines

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Having the best rifle and ammo won’t matter if you have a terrible magazine. A good magazine will significantly improve the reliability of your weapon. A well-built, properly packed magazine will consistently load rounds into your chamber even in the most unfavorable conditions.

For those who aren’t sure what they’re looking for, it might be difficult to find the best .300 blackout magazines. The normal 5.56 magazines are so widely used that many people forget they’re not the best option if you’re looking to get maximum performance.

If you’re looking to buy a magazine compatible .300 AAC blackout or finally decided on buying a magazine made just for the .300 AAC Blackout we’ve got everything you need to help you narrow down your choices and hopefully, even help you find the right magazine for you.

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The .300 AAC Blackout Round

Image source: Gallery for Great Guns

Before we talk about magazines, let’s talk about why you should even go with the .300 Blackout in the first place.

Since it’s inception in 2011, the .300 Blackout has become one of the most popular AR-15 calibers. Originally created as a specialized close-combat round for spec-ops, the .300 AAC Blackout cartridge for the AR-15 platform has grown in popularity on the civilian market in recent years with good reason.

The heavier gain .300 AAC Blackout offers better ballistic performance and stopping power than the more popular 5.56 round in subsonic AR setups. Since the case dimensions of the 5.56 and .300 AAC Blackout are almost the same, you can load the .300 AAC Blackout into most standard 5.56 rifle configurations without running into issues.

Can’t I Use My 5.56 Magazine?

Image source: Primary Arms

Since the case and cartridge dimensions of the 5.56 and the .300 AAC Blackout magazines are almost the same, the .300 AAC is technically compatible with 5.56 magazines. You can run the .300 Blackout through 5.56 magazines without issues. However, it’s always a good idea to use magazines specifically made for the caliber you’re loading on your rifle.

There’s a good chance you’re buying new magazines anyway so your rifle can chamber the .300 Blackout. Even if you might have multiple 5.56 magazines at your disposal, the key thing to remember is that while most 5.56 magazines won’t have issues with the .300 Blackout, you don’t want to have to find out problems during a self-defense situation.

For instance, your 5.56 magazine won’t feed the .300 properly onto your receiver. Also, if you can get the proper magazine for your round, why wouldn’t you?

If you do insist on using 5.56 magazines for the .300 Blackout round, just remember that as a general rule the .300 AAC blackout magazines are more likely to work well in a metal USGI-style 5.56 magazine, and less likely to work in a polymer 5.56 magazine.

Also, there’s a good chance you won’t be able to fit the full number of rounds intended to fit your magazine due to suboptimal magazine geometry. For example, a 20 round 5.56 magazine might only find 18- or 19- rounds, maybe a full 20 with a little more push, but a 20 round .300 Blackout magazine is guaranteed to stack the entire 20 rounds.

How Many Magazines is Too Many?

Image source: Coupon XOO

The answer to this question is simple: you can never have enough magazines, but you can have too few.

Is 10 too much? 15, 20? I can’t really give you a number of magazines to stop at since each person uses their firearm differently. However, I can tell you right now that .300 Blackout magazines are limited. And with the ongoing gun and part shortages, it’s best to just stock up on enough magazines that you’re comfortable owning for each caliber you plan on using.

Also, don’t worry about having extra magazines. Even if you only end up using two or three magazines at a time, it’s always good to have extra magazines in storage for you to fall back on incase of a malfunction, if you’re trying different rounds or even if you just want to spend a long time at the range without having to repack you magazines.

Buyer’s Guide for the Best .300 Blackout Magazines

Build Material

Almost all AR-15 magazines are built out of either steel or alumiinum alloy bodies. Manufacturers often use 6061-T6 aluminum, a durable polymer, or a hybrid of both. However, most of the time, polymer seems to outdo steel and aluminum bodies outright. It’s a lightweight and versatile material that can withstand a lot of wear and tear for a fraction of the cost.

Build Quality

An ideal magazine will come with a high quality metal spring and metal followers. This ensures that the rounds will feed reliably from the magazine into the firing chamber. Some of the more premium options will have a stainless steel spring with a polymer or aluminum anti-tilt follower. These are on the pricier end of the spectrum but you’re sure to come out with a magazine that’s durable and will work great for a long time.

Ease of Ejection

Although often overlooked, your magazine should eject smoothly out of your AR. The last thing you want in a shootout is having trouble replacing your magazine. A magazine that ejects properly should release itself immediately after triggering the mag-release button. It should also drop out of your AR without snagging or needing assistance.

Texturing

Although modern magazines are designed to withstand tough falls, dropping a magazine might misalign one of your cartridges. Or you might get large debris inside the magazine that can lead to feeding problems while shooting.

A good magazine will have a flared base, non-slip texture or non-slip grooves on the body. These features make it easy to grab in any weather condition. If you tend to wear gloves when shooting, try finding a magazine with deeper grooves to give you more surface area to grab on when replacing your magazine.

Review Your State Laws

Remember to abide by all applicable federal, state, and local laws. When in doubt, err on the side of caution. As you’re probably well aware, there are certain states, including Illinois, New York, and California, that have very tight gun laws and heavily regulate AR style weapons.

Additionally, these gun restrictions can regulate magazine capacity for your AR-15. For example, in California since the year 2000 it’s been illegal to purchase or import large capacity magazines. Unfortunately, California decided that anything over 10 rounds is large capacity for an AR. So if you live in there or other states with similar gun restrictions, make sure to get a state compliant .300 blackout magazine.

Best .300 AAC Blackout Magazines for 2022

Image source: Brownells

If you’re looking for an affordable .300 Blackout magazine, consider the AR-15 .300 Blackout Magazine from D&H industries. The D&H Industries .300 Blackout magazine is available in 30, 20, and 10 round configurations. It also comes in standard USGI dimensions. It’s built out of 6061-T6 aluminum with a Teflon finish for excellent rust and corrosion resistance.

As a pioneer in the .300 Blackout magazine market, way before Magpul or lancer ever came out with their own versions, these .300 magazines have withstood the test of time. Although not exactly the most durable in the market, they don’t actually break at all. Instead, they tend to bend and dent which doesn’t sound too bad but can also cause feeding problems later on. So if you do end up going with this magazine, make sure to always inspect the feed lips to ensure they’re still in good shape, especially if they’ve been roughed up or dropped during use.

However, don’t let that little detail discourage you. If you go through ammo like crazy, these are relatively inexpensive magazines for you to use. The built in red tilt spring follower also does a great job at preventing bullet pinching and cartridge jams within the magazine. You might need to get used to the cartridge orientation since this one ends on the left side while the majority of magazines end on the right, which is honestly really weird.

Pros Very affordable

Proper internal geometry

Pre-compressed, passivated stainless steel springs for consistent performance

No pinching issues Cons The opposite follower orientation

Won’t work well with heavier grain .300 Blackout ammo

Image source: Brownells

If you’re looking for a reliable magazine that will last you a long time, the L5AWM 300BLK is one of the most dependable magazines for the AR-15 platform. It has a transparent smoke finish that’s visually stunning. It also gives you an approximate view of the cartridges in the magazine. The company is also well known for its AR-15 5.56 magazine, whose initial design heavily influenced the outcome of the .300 blackout mags.

The L5AWM .300BLK from lancer systems is made from the same ultra-durable polymer construction and steel feed lips as the 5.56 L5AWM. The internal geometry is designed specifically to help heavier grain .300 blackout subsonic ammo to stack properly, improving the reliability of the magazine feed even on full-auto.

I think one of the best things about this magazine might be depression molded 300 Blackout label on the side of the magazine. It’s a nice touch to help you distinguish cartridges for different magazines, especially if you own both the 5.56 lancer L5AWM and the .300 Blackout version.

If you don’t like the look of translucent smoke mags for your system, the Lancer Systems AR-15 L5AWM 300BLK also comes in an opaque black and available in 10,20 and 30 round configurations.

Pros Hardened steel feedlips

Super durable polymer body

Perfect geometry for feeding the .300 Blackout cartridge

Great grip texture Cons Feedlip can warp during extended use

Image source: Brownells

The Brownells AR-15 magazine is one of the best AR-15 magazines thanks to its high quality aluminum construction and durable stainless steel spring. These ensure reliability and proper feeding. Remember that this magazine is technically chambered for 5.56, but it will still work for .300 Blackout even though it is technically not optimized for the round.

When Brownells built this magazine, they wanted to create a battle ready magazine that can withstand a lot of abuse. The result is a magazine built to ISO standards with a hard coat anodized finish for superior rust and corrosion resistance. It also comes in gray and desert tan colors to help you match the aesthetic of your firearm.

Pros High quality aluminum construction

Superb surface wear and weather resistance

Built to ISO quality control standards Cons Not optimized for the .300 Blackout

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If you’re looking for a high capacity magazine for your rifle, consider getting the SureFire 60 round magazine. Although coffin rounds are not as reliable as drum magazines like those made by Magpul, the traditional magazine shape is what sets it apart from other high-capacity rounds on the market. And since it loads the 5.56 and 2.23, you should be able to load the .300 Blackout rounds as well.

Not only is it aesthetically a better fit to standard AR rifles, it also doesn’t take up as much space as other high-capacity mag configurations. As a result, it is easy to maneuver with and lug around if you plan to attach using some kind of body holster.

Image source: SureFire

Unfortunately, if you are running on a budget, this might not be for you. The Surefire 60-round is an expensive magazine considering it only carries as many rounds as two $20 mags at five times the price. There’s a 100 round capacity version that’s a little more bang for your back but that’s gonna set you back almost $200 post tax. So it is an expensive commodity. But you get the convenience of reloading less, bringing less magazines with you and being able to out shoot your opponent should the need come.

Pros Durable polymer material

Traditional magazine shape

Easy to store and carry Cons Expensive

Our Pick

The Lancer Systems .300 Blackout Translucent Smoke Magazine is our top pick-up at a reasonable price. This magazine is extremely durable thanks to a mix of high quality polymer and steel construction.

Also, the 300BLK magazine’s geometry is specifically designed to enhance reliability of feeding the heavier .300 Blackout subsonic cartridge into your rifle allowing you to get off consecutive shots without issue. It also comes in an opaque black color in case the translucent design isn’t really your style.

Wrapping Up

Any one of the.300 Blackout Magazines that we’ve covered here today will make a solid choice for your collection. If you do end up going a different route, you can always follow our buyer’s guide section that we went over earlier to help you find a .300 AAC Blackout magazine that works better for you.

Keep in mind when choosing a .300 Blackout Magazines that you need to be aware of the exact type you’re buying. Although most 5.56 magazines will work with the .300 Blackout, it’s always better to find a magazine that’s configured specifically to the .300 Blackout round to prevent feeding issues later on. If you do insist on a 5.56 Magazine, find one with steel feed lips or an aluminum body since these tend to work better for the heavier .300 Blackout rounds.

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