Best .300 Blackout Bolt Carrier Groups (BCG) – 2022 Review

| Last Updated:
August 24, 2023

Finding the best BCG for a .300 Blackout is no easy task. The reason being is that there are a ton of them flooding the market. Most are cheap and low-quality, making it difficult to find a good one that fits a rifle perfectly.

However, to reduce the number of headaches and wasted time, we've taken the liberty of tracking down five of the best BCGs for a .300 Blackout. These are what we believe to be the best on the market as of this writing.

Before we unveil the list, we're going to discuss what a BCG is and the purpose of it. On top of that, we'll quickly give you a few tips on how to choose a good quality BCG over a poor quality model.

Comparison of the Best .300 Blackout Bolt Carrier Groups (BCG)

  • Staked Gas Key
  • Stained in Matte Black
  • Best .300 Blackout BCG for the Money
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  • Staked Gas Key
  • Chrome-Lined Interior
  • Bolt and Carrier Made From Steel
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  • Easy to Install
  • Constructed From High-Quality Steel
  • All Parts are Heat-Treated and Shot-Peened for Extra Durability and Strength
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  • Chrome-Lined Interior
  • Made From Durable Steel
  • Shot-Peened and Pressure Tested
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  • Coated in Bronze
  • Chrome-Lined Interior
  • Crafted From High-Quality Aircraft Grade Steel and Heat-Treated for Extra Durability
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What is a BCG and How Does it Work?

First off, BCG stands for Bolt Carrier Group. This is considered to be the heart of your .300 Blackout rifle. Without it, it’s pretty much useless. This is the engine to your car, so to speak. And of course, the car won’t run if it doesn’t have a functioning engine.

So what exactly does the BCG do for your rifle? This is designed to ensure that your firing patterns are smooth and less likely to glitch and jam on you. The same can also be said for the reloading process of your rifle.

BCG (Source)

That’s what you should expect from a good quality BCG. If one frequently jams or gives you grief during the reloading process, it’s useless. The bolt in this accessory is designed to guide the next round into the chamber that emerges via the magazine. This will also ensure that the round is placed correctly and is fully aligned so it won’t jam while ejecting.

Aspects to Consider Before Buying a BCG

Before you even consider purchasing a BCG, the important thing is to know what factors will go into your decision making. Picking out a product on a whim is not only unwise but can also be a dangerous decision.

A constantly malfunctioning accessory will not only cause problems for your rifle but may also pose a safety risk. This should be worth keeping in mind while choosing a good quality BCG. With that in mind, here are some aspects to consider before making a purchase:


If you’re a .300 Blackout rifle owner on a budget, you’ll obviously consider price as one of your major factors in your buying decision. That is completely understandable.

One thing that you need to keep in mind is that price should not be the only factor in your decision. The goal here is to find a BCG that is good in quality and sold at a price that will fit most budgets.

The main reason is to ensure that you avoid buying low-quality and cheap product and won’t break the bank purchasing one.


As mentioned, quality should always be a top priority before anything else. That's why it is important to pay attention to which materials are used to manufacture these BCGs. Nine times out of ten, they will usually be made from either high-quality steel or aluminum.

One thing to pay close attention to is the chrome lining found on the inside of the BCG itself. This is designed to prevent it from rusting or corroding from the inside. If you see a BCG that does not have this chrome lining, in particular, avoid it at all cost. The longevity may not be as long-lasting without the proper lining.


Of course, the BCG is what makes a rifle function. So obviously, installation is required. The important thing to look for in a BCG is how easy is it to install. The keywords you want to look for when finding something that's easy to install is "drop in". Drop-in means they are easy to install without the use of tools or the professional services of a gunsmith.

Review of the Best .300 Blackout BCGs

Below are the five best BCGs for a .300 Blackout, in our opinion. These are currently the top products on the market so far. While the list may be subject to change at any point between now and next year, we believe that one of these has the potential to be yours.

Remember to read through each of these carefully, as they may have a feature or two that may check off a box on what you’re looking for in a BCG. With that in mind, let’s begin by taking a look at the best overall BCG on the market:

Best Overall: 
Brownells - M16 Mil-spec MP/HPT BCG


  • Super Durable
  • Can Handle Just About Any Kind of Abuse
  • Functions Extremely Well for a Budget BCG


  • Ejector Spring May Weaken After a Couple of Thousand Rounds
  • Some Have Complained About Some of the Pins Not Being Secure
  • One Reviewer Complained About Having Difficulty With Moving the Bolt

This is perfect for those who are looking for an excellent BCG that also fits their budget. Lucky for them, we’ve found one in the Brownells’ M16 Mil-Spec BCG. This fully-assembled unit comes with the bolt itself, the bolt carrier, and your necessary pins (cam, firing, and fire retaining).

Obviously, we can’t forget the gas key that comes with this. The bolt is machined from high-quality carpenter steel. In plain English, that’s a pretty tough piece of steel. After it’s machined, the Brownells’ product will undergo a series of tests.

More specifically, they’re all heat-treated and shot-peened to ensure the best in durability. If it passes with flying colors, it will withstand a good amount of abuse or anything else that may try to damage it.

The bolt and the BCG are stained in matte black and are designed to give it that mil-spec look. On top of that, you have a gas key that is staked and has an extractor that includes red O-rings with springs.

If you’re looking for a high-quality BCG at a price that you can afford, then you might consider the Brownells’ as the best possible choice for a BCG.

You deserve a BCG that will help your .300 Blackout rifle function properly. At the same time, you want one that won’t suck the life out of your bank account. This Brownells' brand BCG may be the best for a variety of users.

Bottom Line

As expected, we found this to be one of the best, most affordable BCGs for .300 Blackout owners. This is not a “you get what you pay for” kind of BCG. You’re getting more than what you pay for.  

Even if you’re on a budget, this might be a good BCG for you and might surprise you in terms of quality and performance. Super durable and smooth in overall performance is what you’ll get out of the Brownells brand BCG.

 2A Armament - AR-15 BGG


  • Very Easy to Install
  • Helps Rifles Shoot Very Well
  • Super Easy to Adjust When Accessing it Via the Port Door


  • None

The next BCG we’ll be taking a look at is the 2A Armament AR-15 BCG. Right off the bat, you’ll notice that this is a lightweight BCG that won’t add any unnecessary weight to your gun once you have it installed.

Since you have a rugged, fully-loaded .300 Blackout rifle at your disposal, you have enough weight to carry around as it is. This BCG has passed pretty much every manufacturing test known to man and proves itself to be a super tough and super reliable unit for your rifle.

Every single piece of this BCG is heat-treated, shot-peened, and machined from highly durable steel. Inside and out, this is one tough puppy. On top of all this, this is a drop-in BCG that is easy to install and ready to go the second it’s set up.

If you think you need a gas block for your rifle, you don’t need to worry about that. That’s because the 2A Armament BCG will be in tune with your .300 Blackout rifle’s gas system. The big surprise, this also fits perfectly with all kinds of parts like springs, barrel lengths, and suppressors.

You can adjust this BCG via the port door. That means you don’t have to disassemble the entire rifle just for the sake of adjustments.

Bottom Line

The 2A Armament BCG sticks out as one of the best on the market for a few good reasons. Inside and out, this is designed to handle a serious beating. At the same time, this will help your .300 Blackout rifle function like a well-oiled machine.

What impressed us the most is that it does away with the idea of using a gas block and doing away with disassembling a rifle just to make some minor adjustments. With that in mind, the 2A Armament is worth the extra look if you’re looking for a BCG that is easy to install, easy to adjust, and allows your gun to easily fire without jamming or other functioning issues.

Best for the Money:
PSA 5.56 Premium Full Auto BCG


  • Can Tolerate a Lot of Abuse
  • Functions Without Any Issues of Jamming
  • A Very Good BCG for Those Who Appreciate Mil-Spec Accessories


  • Fit and Finish Could Be Better
  • One Reviewer Complained About This Being a Basic BCG.
  • Some Have Claimed That the Gas Key isn’t as Staked as it’s Supposed to.

Next, we'll be taking a look another great choice of BCG. The PSA 5.56 Premium Full Auto BCG deserves a place on this list. If you're looking for something that is going to be excellent in quality and performance, you're looking at it right now.

This is made right here in the U.S.A., so obviously, it is guaranteed to be the best in quality and performance. Most gun manufacturers often follow strict guidelines for making this happen. So if you see that any gun accessory is made in the U.S.A., you know that the quality will be the best period.

This is a shot-peened bolt, which means that it’s been shot during its course of tests. This is designed for overall durability. Plus, it has also passed the pressure test with flying colors, meaning this will have the ability to handle high-pressure cartridges.

To ensure a long life, the BCG has a chrome lining in the interior, which means it will be resistant to rust or corrosion. Inside and out, this is a tough customer that will make sure your .300 Blackout rifle functions properly.

Bottom Line

PSA is considered one of the more reliable brands of all kinds of guns and accessories. On top of that, they offer them at affordable prices. 

So if you’re on a budget and want a product that’s considered one of the best, you might want to consider the PSA brand.

4. Cryptic Coatings Mystic Bronze Complete BCG


  • The Finish is Beyond Perfect
  • Will Last You Years, if Not Decades
  • Works Perfectly With Binary Triggers


  • None

Next on the agenda, we have the Cryptic Coatings Mystic Bronze Complete BCG. This is one of six BCGs available in all kinds of high luster coatings. The purpose of these coatings is to regulate the temperature all while the BCG gives your .300 Blackout rifle stellar performance.

Not only will you get a stellar performance, but you can also expect this to reduce a good deal of recoil on your rifle and provide reliable, consistent cycling. In plain English, you're dealing with a BCG that will give you smooth, non-jammed shots every time you pull the trigger.

No matter what your intended purpose for your .300 Blackout, the CC BCG will prove itself to be a great alternative to any of the other good quality BCGs you'll find on the market.

The interior is chrome-lined so it won’t be damaged and will be resistant to corrosion and rust. If longevity is something you consider a top priority, there might be nothing better than the CC BCG.

On top of that, this is wear-resistant, so you may consider this BCG the last one you’ll need to buy for years or even decades. If that’s exactly what you’re looking for, consider the Cryptic Coatings BCG as a finalist on your shortlist of possible buys.

Bottom Line

This is probably one of the best on the market in terms of BCGs for the .300 Blackout. At this rate, we won’t be surprised if this topples the top product on the list in the not so distant future. This not only plays a role in temperature control, but is also top-notch in overall performance and quality.

If you choose this for your BCG, don’t be surprised if this puppy lasts you a long period of time. If you’re planning on using your rifle for a long period of time, you’ll need a product that is built to last, and the CC BCG is just that.

5. Anderson Manufacturing - M16 5.56 BCG


  • Stakes Are Quite Strong
  • Great Shot Groups at 100 Yards Out
  • Performs Flawlessly for Most .300 Blackout Rifles


  • Gas Key May Need to be Restaked if Such a Situation Were Warranted

Next up, we’re going to be looking at the Anderson Manufacturing M16 5.56 BCG. Both the bolt and the carrier are crafted from high-quality steel, which means that these are going to be tough as nails and impervious to any kind of abuse you can think of.

Shot-peened? Check. Heat-treated? You got it. Chrome-lined interior? Yep. Inside and out, you can expect this to be resistant to corrosion or rust. In other words, this is going to work hand in hand with your .300 Blackout rifle for many years to come.

All the parts and components are stained in a black matte finish, making it blend in perfectly with most .300 Blackout rifles.

Bottom Line

The Anderson Manufacturing BCG is a battle-tested, tough-as-nails kind of accessory that does its job in delivering reliable, non-jamming shots for your rifle. Once installed, you can expect your rifle to shoot well and be able to cycle properly without any issues to speak of.

This BCG is easy to install and very simple to put to good use. If that’s what you’re looking for in an accessory like this, get the Anderson Manufacturing BCG.

Full-Auto vs. Semi-Auto Bolt Carrier Groups

So, what’s the difference between fully automatic and semi-automatic bolt carrier groups? And are they legal to own? The short answer to the legality question is yes.

However, it is important to double check your local and state laws prior to purchasing, just to make sure. Other than that, a fully automatic BCG has a rear lug that can push the sear release in a downward direction, allowing the gun to fire in full auto mode (or burst fire mode).

Semi-automatic BCGs are extra cut so won’t take up a lot of mass. The lesser amount of mass is also a plus if you want the best in reliability. Semi-Auto BCGs are more affordable compared to their fully auto counterparts.


Finding the best BCG for a .300 Blackout doesn't have to be a challenge. But it is a must-have if you want your .300 Blackout rifle to function properly. Your search may take some time, but it's important to find the best one that will fit your rifle properly and last you years or even decades. Be sure to do more in-depth research if you come across a BCG that you like prior to purchase.

We hate buyer's remorse and don't want you to go through it. So be sure to listen to what people are saying about it and use your best judgment when the time comes to choose a BCG of your own. 

Michael Lutes

Michael Lutes is the managing editor and owner at Gun Mann. He is a veteran, gun enthusiast, 3 gun competitor, and 2a advocate. Mike has a passion for innovation and education across the industry to create great content, training, and insights from the best and brightest.

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