Best .300 Blackout Barrels [June 2023]

The barrel is probably to most intricately designed part of your 300 Blackout rifle. When it comes to having great accuracy, the barrel plays an essential role in a .300 Blk rifle. From this article, you will find out more about the importance of a barrel’s length and how does it affect your overall shooting experience with your rifle.

Also, you should take a look at what factors you should consider when choosing the best barrel for your 300 Blk rifle.

BarrelsNameEditor’s CommentRatingGet The Best Deal
BSF 16″ 300 Blackout Pistol Gas 1:8 Twist

Most Recommended Option

1. 5R button rifling
2. Optimal twist rate
3. Carbon fiber sleeve

Faxon Firearms – AR-15 BARRELS 300 Blackout Gunner Profile1. Gunner profile
2. Quick and easy to maneuver
3. Can withstand heavy rate of fire
9.5/10SHOP NOW
10.5″ 300 Blackout 1-8 Med Pistol Gas System Barrel1. Nitride finish
2. Works with many guns
3. Easy to install
9.0/10SHOP NOW
PSA 10.5″ CHF 300 AAC Blackout 1:8 Pistol Gas Barrel1. HPT and MPI
2. Mil-Spec phosphate-coated
3. Heavy profile short-length barrel
8.5/10Currently unavailable

Crucial Elements for A 300 Blk Barrel

There are many underlying factors to consider when it comes to picking your next upgrades, in this case it will be your rifle’s barrel. Let us walk you through the important factors you need to consider.

Barrel length

This is perhaps the most important feature of a barrel. The longer the barrel, the more rifling grooves it has. This means that a longer barrel will offer more surface area for the bullet to spin, this is also known as twist rate. A longer barrel is great because it stabilizes the bullet and ensures that it will retain its ballistic properties over long ranges.

Another great feature of a long barrel is its longer sighting plane (distance between the front and the rear sight), this would, in turn, offer you a better aiming and accuracy as you shoot.

Since a longer barrel has more space for the powder to burn and gas to expand, it creates more force and propels the .300 Blackout bullet at a faster velocity, hence increasing its range.

This is why rifles have a longer effective range compared to pistol-length guns.

If you are into long-range shooting, you would want to go for longer barrels. However, if you want a CQB gun for home defense or short-mid range shooting purposes,, a shorter barrel would do just fine without compromising on manoeuvrability.


These days, barrels are available in a wide variety of builds ranging from blued steel to alloy composites and carbon fiber.

The rule of thumb here is always – the more sophisticated the alloy is, the longer the barrel would last. That said, your budget would also play a big role in deciding what materials you would want to go for since better allows tend to cost more.

Twist rate

The twist rate of a barrel is also essential as barrels with lower twist rates tend to produce more accurate shots in general and a great for supersonic rounds and long-range shots.

Contour and profile

Heavier barrels are more stable, cool quicker, and are great for quick and accurate follow up shots. That said, they tend to be heavier, whereas lighter barrels are a popular choice for hunting and a slow rate of fire. A great mix between these 2 types would be a fluted contour barrel and a carbon fiber barrel.

Top 4 Best 300 Blackout Barrels

1. 10.5″ 300 Blk 1-8 Med Pistol Gas System



  • Cartridge: 300 AAC Blackout
  • Length: 10.5″
  • Contour: Medium
  • Finish: Black
  • Muzzle Threads: 5/8-24
  • Twist: 1-8


The 10.5″ 300 Blackout 1-8 Med Pistol Gas System Barrel comes with a 10.5’ barrel with a pistol gas system. This barrel comes with a heavy profile and was designed to endure high rates of fire.

Featuring a 1:8 twist rate, this barrel makes it ideal for .300 Blackout rounds that are between 115 to 165 grains. The 10.5″ 300 Blackout 1-8 Med Pistol Gas System Barrel also features a SOCOM contour and is constructed from 4150V steel, this means that you won’t be looking for a replacement in the near future.

Seeing this barrel is relatively short, it would be ideal for hunting, shooting competitions, and for home defense purposes.

If you don’t clean your rifle often because of the hassle, the nitride finish on the 10.5″ 300 Blackout 1-8 Med Pistol Gas System Barrel would do just the trick by making cleaning easy. In addition, the nitride finish would also enhance the service life of the barrel.

Upon mounting this barrel on your .300 Blackout rifle, it provides an exceptional good headspace. This barrel is pretty versatile and compatible as it will work well with most AR-15 platforms which offer you better value for money considering its top-notch quality and performance.

Being a heavy profile barrel, it will be perhaps the best option for almost every .300 Blackout application i.e. home defense, CQB, hunting, and etc. without making a large dent on your bank account.

You will like this product if:

You are a close-medium range shooter. Being only 10.5’ long, it’s a pistol-length barrel that’s great for shooting at close-medium ranges. Top that with its heavy profile feature, this barrel would be great for shooting both supersonic and subsonic .300 Blackout rounds at close-medium ranges.

You are shopping on a tight budget. Available on for only $108.99, most people would be comfortable with that price tag. Considering its specifications and application potential, you will be getting one of the best .300 Blackout barrels on the market for this price.

You might not like this product if:

You don’t want a heavy profile barrel. With heavy profile barrels, it comes with its pros and cons. If you want your .300 Blackout rifle to weigh less, this heavy profile barrel might not be the best option for you.


2. Faxon Firearms – AR-15 BARRELS Gunner Profile



  • Available in 7.5″ and 10.5″, with gas port drilled for pistol length gas tube, and 16″ with carbine-length gas port
  • Gas Port: .104″
  • Gas block journal: .750″
  • Outside diameter: 1.9″
  • SAAMI-chambered with 1-8″ twist rifling stabilized the full range of 300 BLK bullets
  • 11° target crowned muzzle
  • 5/8-24 TPI muzzle threads
  • Black QPQ Nitride finish with NP3-coated barrel extension
  • Barrel Extension: M4 feed ramps


These barrels from Faxon Firearms come with a unique ‘gunner’ profile, which will offer you the right mixture of ergonomics, heat dissipation, and weight in order to provide you with an enhanced shooting experience.

These 300 Blk barrels feature a slight pencil profile before the gas block, this was specifically designed to keep the weight of the barrel down in order to preserve the rifle’s overall handling. The part behind the gas block has more material so it will be able to withstand extreme heat during a high rate of fire.

These .300 Blk barrels from Faxon Firearms are available in 3 different lengths, namely: 7.5’, 10.5’, and 16’. The 7.5’ and 10.5’ barrels come with a pistol length gas system, whereas the 16’ barrel comes with a carbine-length gas system.

In terms of durability, these barrels have a Black QPQ Nitride finishing with NP3-coated barrel extensions which enhances the service life of these barrels and makes cleaning easy. With easy cleaning and increased service life, you won’t be going around looking for replacements anytime soon.

As mentioned earlier, one of the nicest features of these barrels is the gunner profile, which was designed specifically for quick maneuverability and rapid firing. Also, the muzzle has been threaded with 5/8 – 24 threads in order for it to be compatible to accept various muzzle devices. These barrels also come with the latest 5R rifling which improves the accuracy of your .300 Blackout rifle.

You will like this product if:

You are a tactical person. The gunner profile of the Faxon barrels makes them great for tactical applications and strenuous tracking and hunting in the woods. Besides that, they also have great aesthetics and are easy to maintain.

You shoot on the range. Shooting on the range would usually expose your barrel to a heavy rate of fire. The part behind the gas block of these barrels have the material to withstand the extreme heat that comes with the heavy rate of fire.

You might not like this product if:

You don’t want to fit it. Unfortunately, some users have commented that these barrels might require some fitting. If that’s not what you want, then this product might not be your best buy.


3. BSF 16″ Blk Pistol Gas 1:8 Twist



  • Barrel length: 16’
  • Gas Port: .104″
  • Gas block journal: .750″
  • Outside diameter: 1.9″
  • SAAMI-chambered with 1-8″ twist rifling stabilized the full range of 300 BLK bullets
  • 11° target crowned muzzle
  • 5/8-24 TPI muzzle threads
  • Black QPQ Nitride finish with NP3-coated barrel extension
  • Barrel Extension: M4 feed ramps


The BSF 16″ 300 Blk Pistol Gas 1:8 Twist is a rifle-length barrel seeing that it is 16’ long. Besides that, it also comes with a pretty durable body as it’s constructed from 416R stainless steel.

BSF specifically designed this barrel to be rolled up in a carbon fiber sleeve in efforts to reduce your .300 Blackout rifle’s overall weight without compromising on its durability and strength over heavy rates of fire.

In relation to the carbon fiber sleeve, it covers most of the barrel and has holes for ventilation. These hopes were put there to dissipate heat quickly, which would allow you to now take quicker follow up shots without having to compromise on accuracy.

Also, this barrel has been rifled with the latest and most innovative 5R button rifling technology and features a 1:8 twist rate, which will offer you great versatility to be compatible with a wide range of applications.

Besides that, the muzzle has also been threaded with 5/8 x 24 threads, which would allow you to mount a variety of muzzle devices.

This 16’ barrel would be ideal for short-range hunting, target practice, and shooting competitions. Similarly, the pistol-length gas tube that’s included has been found to be the ideal gas system length for a 300 Blk round.

You will like this product if:

You want a barrel that’s built to last. Constructed from 416R stainless steel and rolled up with a carbon fiber sleeve, you will be getting an accurate .300 Blackout rifle that’s capable of withstanding heavy rate of fires without a heavyweight.

You want a versatile barrel. Coming with a muzzle that’s been threaded with 5/8 x 24 threads, it’s pretty awesome as it will allow you to mount most muzzle devices on your .300 Blackout rifle.

You might not like this product if:

You have a tight budget. Coming with a price tag of $521.54, it won’t fit into everyone’s budget, especially if you have a tight one.


4. PSA 10.5″ CHF 1:8 Pistol Gas Barrel


  • 10.5″ Barrel Length
  • Hammer-Forged Machine Gun Steel Barrel
  • Extra Thick Chrome Lined Bore
  • 300 AAC Chamber
  • 1 in 8″ Twist
  • High Pressure Tested
  • Magnetic particle Inspected
  • .750″ Gas block Diameter
  • Pistol Gas Length
  • M4 Feed ramps


If you are looking for a pistol-length barrel, the PSA 10.5″ CHF 300 AAC Blackout 1:8 Pistol Gas Barrel might just be the one for you. This barrel would serve you for a long time as it has been hammer-forged from Chrome Moly Vanadium Steel and chrome-lined on the inside.

Besides having such a short barrel length and a pistol gas system, the barrel has also been contoured for an optimized heat management as it goes through consecutive shots in quick succession. In terms of stability, its 1:8 twist rate serves great for stabilizing projectiles of different weights and velocities.

The chamber is also heat pressure tested and magnetic particle inspected to remove any flaws during the manufacturing process. In terms of durability, the barrel has also been mil-spec phosphate coated. This barrel is fully furnished and ready to install straight out of the box.

You will like this product if:

You are a short-range hunter. The design and profile of this barrel make it ideal for short-range hunting applications as the short barrel length is going to reduce the weight by a significant amount.

You might not like this product if:

You are a long-range hunter. Unfortunately due to the shorter barrel, your .300 Blackout rounds will not have enough velocity for long-range hunting applications beyond 200-300 yards.

Frequently Asked Questions

Q: Do stainless steel barrels last longer?

No, it won’t last longer than a chrome-moly barrel. In terms of durability, stainless barrels will lose their accuracy around 700 rounds sooner than chrome-moly barrels.

Q: What makes a barrel more accurate?

A perfectly aligned chamber is one of the essential factors to obtain the maximum accuracy from a rifle barrel.

Q: Are threaded barrels more accurate?

Yes, the bullets will have more force and hence, a higher velocity which would increase the accuracy of the shots.

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