• Post category:Bolt Carrier Group
  • Post last modified:February 2, 2023
  • Reading time:28 mins read

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What is BCG? 🤨

It stands for bolt carrier group, which is a critical part of a rifle. Without the BCG, the gun will not function correctly and may even fail. 

  • ✅ A BCG specifically designed for 300 Blackout rounds offers a much higher level of performance than general AR-15 BCGs since it is tuned to work with this caliber of ammunition.
Our Top Pick
Brownells Mil-Spec MP Bolt Carrier Group
It is machined from steel and hardened to ensure proper function in either semi-auto or full-auto ARs. Furthermore, an installed extractor with a red o-ring spring prevents any wear and tear from excessive firing cycles. Finally, the parts feature a matte black mil-spec finish for ultimate discretion in any situation.
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Features✨

Some of the key features are bolt and carrier design, coatings, craftsmanship, and durability.

  • ✴️ The bolt is an important part of any BCG for 300 Blackout. The bolt should be machined from steel or better, with components such as the extractor being made from S7 tool steel if possible.
  • ✴️ Feature chrome lining in the bolt and carrier group will ensure that the BCG is corrosion-resistant and will last for many years.
  • ✴️ Many BCGs come with various types of coating, from nitride to nickel boron and more. While each type of coating offers its pros and cons, it is important to choose a BCG which has been treated with an effective coating to protect it against wear and tear over time.

Benefits💥

When it comes to choosing the best BCG, many benefits should be taken into consideration.

  • ❇️ It is designed to provide enhanced durability and performance in your firearm, making it a great choice for shooting situations where accuracy and reliability are paramount.
  • ❇️ Improved wear resistance, better gas system performance, and increased buffer life are some of the advantages that come with selecting.
  • ❇️ In addition, it also helps to reduce recoil, allowing shooters to remain on target during longer shooting sessions or competitions.
  • ❇️ Furthermore, BCG ensures compatibility with any compatible rifle platform and ammunition type, making them an ideal choice for shooters.

What types?🤠

  • ☑️ Standard Mil-Spec BCGs provide reliable performance in extreme conditions. They consist of steel which allows for easy maintenance and durability under harsh shooting conditions. Furthermore, they are generally affordable and will serve you reliably without breaking the bank.
  • ☑️ Enhanced BCGS offer enhanced reliability due to their machined components that fit with tighter tolerances. They feature stainless steel components and are generally more expensive than the standard due to their improved performance.
  • ☑️ Lightweight BCGs have the advantage of being much lighter than standard. This makes them ideal for shooters who need a lightweight and reliable BCG.
  • ☑️ Nickel Boron Coated BCGs offers enhanced corrosion resistance, smoother operation, and easier cleaning compared to other options. The coating on these BCGs also helps keep fouling from building up in the firearm, which can reduce the need for frequent cleanings.
  • ☑️ Finally, Titanium Nitride Coated BCGs are the most durable option on the market. These BCGs have a coating that is much harder and more resistant to wear than standard. This makes them ideal for shooters who need an ultra-durable BCG that can last through thousands of rounds of shooting without needing replacement.

  • 🚩 There are several types to choose from, each has its advantages and disadvantages but all should provide reliable performance in the field.

Best BCG For 300 Blackout

Top 14 BCG For 300 Blackout

1# Anderson Manufacturing AR-15 Upper Receiver Assembly

ANDERSON MANUFACTURING AR-15 UPPER RECEIVER ASSEMBLY

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Specification

Cartridge: 300 AAC Blackout

Finish: Black

Style: Assembled

Length: 16″

Twist: 1-7

The Anderson Manufacturing 300 Blackout Complete Upper Receiver is a great option for those looking to quickly and easily build or change an existing AR-15 to shoot the popular 300 Blackout round. Featuring a 16” barrel with a 1:8 twist rate and Type 3 Hard Anodized – Black finish, the barrel utilizes a carbine length gas system with a .125 gas port and 5/8-24 threads with a 308 A2 Flash Hider. Additionally, the Upper Receiver comes without a bolt carrier group or charging handle, allowing you to select your choice of components to complete the assembly.

Pros:
  • Quick and easy to build out or change existing AR-15 to shoot 300 Blackout
  • 16” barrel with 1-8 twist rate and Type 3 Hard Anodized – Black finish
  • Carbine length gas system with .125 gas port
  • 5/8-24 threads with a 308 A2 Flash Hider
Cons:
  • Does not include a charging handle

 

2# 2A Armament AR-15 Bolt Carrier Group Lightweight Adjustable

2A ARMAMENT - AR-15 BOLT CARRIER GROUP LIGHTWEIGHT ADJUSTABLE

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Looking to tune your AR-15’s gas system without the need for an adjustable gas block? Then check out the 2A Armament Regulated Bolt Carrier! This lightweight carrier comes with a gas regulating gate built into the carrier itself, allowing you to tune your gas system with ease. The RBC has infinite adjustment from fully open, to fully closed on the regulating gate, and can be tuned to most combinations of buffers, springs, suppressors, and barrel lengths. Plus, the RBC is fully adjustable through the port door and doesn’t require the firearm to be broken down for adjustment.

Pros:
  • Gas regulating gate built into the carrier itself
  • Can be tuned to most combinations of buffers, springs, suppressors, and barrel lengths
  • Fully adjustable through the port door
  • Does not require the firearm to be broken down for adjustment
Cons:
  • It may be too lightweight for some

 

3# Brownells  AR 15 Bolt Carrier Group

BROWNELLS - AR15 BOLT CARRIER GROUP

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Black Nitride

Brownells has just what you need to upgrade or finish your build – the AR-15 Bolt Carrier Group. This ready-to-roll BCG is built for dependable operation in any AR-15 chambered in 5.56 NATO, .223 Remington, or 300 Blackout. The Brownells AR-15 Bolt-Carrier Group features a bolt machined from 9310 tool steel and heat-treated for durability. The carrier is machined from 8620 hardened steel and finished with a nitride coating for smoother operation and increased wear resistance. Every bolt is magnetic-particle inspected and features a torqued-and-staked gas key.

Pros:
  • Heat-treated and shot-peened
  • Finished in a nitride coating
  • Magnetic-particle inspected
  • Torqued and staked gas key
Cons:
  • May not work with full-auto lower receivers

 

4# Rubber City Armory Bolt Carrier Group Titanium

RUBBER CITY ARMORY BOLT CARRIER GROUP TITANIUM

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Black

If you need a top-of-the-line bolt carrier group that won’t weigh you down, the Rubber City Armory Titanium Bolt Carrier Group is a faultless choice. This BCG features a titanium carrier and is coated with a proprietary aerospace nitride, making it incredibly durable and wear-resistant. Additionally, the bolt is made from 9310 steel and the gas key is properly staked and torqued, ensuring proper function. At just 7.8 ounces, this BCG is significantly lighter than traditional models, making it ideal for reducing felt recoil. Whether you’re a competitive shooter or simply want the best possible performance from your AR-15, the Rubber City Armory Titanium Bolt Carrier Group is the perfect upgrade.

Pros:
  • Titanium carrier for reduced weight
  • Proprietary aerospace nitride coating for durability
  • Bolt is machined from 9310 steel
  • The billet gas key is properly staked & torqued
  • Tool steel extractor and cam pin
Cons:
  • It may experience over-gassing with an increased fire rate
  • Carrier may not be compatible with standard M16 components

 

5# Brownells Semi-Auto Chrome Bolt Carrier Groups

BROWNELLS SEMI-AUTO CHROME BOLT CARRIER GROUPS

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Chrome

The Brownells AR-15 Chrome Bolt Carrier Groups are a great option to finish off your build. Each of these groups features a bolt machined from 9130 tool steel sitting inside of a carrier machined from durable 8620 hardened steel. Both of these essential components, as well as the extractor, gas key, and cam pin, are all plated with chrome to protect against corrosion, as well as offer a slick, low-friction surface for smoother operation and easier cleaning.

Pros:
  • Durable construction
  • Corrosion-resistant chrome plating
  • Smooth operation and easy cleaning
Cons:
  • Not available in all calibers

 

6# Odin Works Bolt Carrier Group

ODIN WORKS INC. BOLT CARRIER GROUP

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Black Nitride

The Odin Works Inc. Bolt Carrier Group is perfect for those searching to make their ARs run right. This black-nitride finished bolt carrier group is designed for use with traditional AR cartridges that share the 5.56 NATO case head. The bolt-carrier group is treated with a black-nitride finish across all metal surfaces, which provides a low-friction surface that doesn’t require as much lube to run properly as phosphate-coated bolt-carrier groups. This carrier group is a great choice for those who want a durable, reliable, and low-maintenance option for their AR-15.

Pros:
  • Reasonably priced
  • Machined from case-hardened 8620 steel
  • Features proper staking to ensure position and reliability
Cons:
  • It may not work well with dirty ammo

 

7# Bravo Company Bolt Carrier Group

BRAVO COMPANY BOLT CARRIER GROUP

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Black

Require a top-quality bolt carrier group for your AR15, M16, or M4? Check out the Bravo Company Bolt Carrier Group. This BCG is fully assembled and features a parkerized exterior and chrome-lined inside carrier. It’s machined to USGI specifications and includes the proper Mil-Spec gas key. The gas key is chrome lined and heat treated per GI specifications, and is secured to the carrier via USGI domestic mfg Grade 8 fasteners. The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158 steel, shot peened for increased strength, and features a tool steel machined extractor and ejector. The BCM Extractor Spring ensures the reliable function of your weapon. Don’t settle for less than the best – get the Bravo Company Bolt Carrier Group!

Pros:
  • Fully assembled
  • Parkerized exterior and chrome-lined inside carrier
  • Tool steel machined extractor and ejector
  • BCM Extractor Spring
Cons:
  • It may be too hard to clean

 

8# Brownells M16 Mil-Spec MP Bolt Carrier Group

BROWNELLS M16 MIL-SPEC MP BOLT CARRIER GROUP

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Matte Black, Phosphate

The Brownells M16 Mil-Spec MP Bolt Carrier Group is a fully assembled BCG that includes the bolt, bolt carrier, gas key, firing pin, cam pin, and firing pin retaining pin. Every bolt is magnetic particle inspected (MPI) and machined from Carpenter 158 steel. Following machining, the bolt is heat treated and shot peened. The installed extractor includes a red o-ring with a spring. The M16 Bolt Carrier is machined from 8620 steel and hardened. The interior of the bolt carrier and carrier key is chrome lined on the M16 Phosphate Bolt Carrier Group only. The M16 Bolt Carrier will function in semi-auto or full-auto AR-15/M16 rifles. The gas key screws are properly torqued and staked. The bolt and bolt carrier features a matte black mil-spec finish.

Pros:
  • Heat treated and shot peened
  • The installed extractor includes a red o-ring with a spring
  • M16 Bolt Carrier is machined from 8620 steel and hardened
  • Gas Key Screws are properly torqued and staked
Cons:
  • More expensive than other BCG brands

 

9# D.S. Arms M16 Bolt Carrier Group

D.S. ARMS - M16 BOLT CARRIER GROUP

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Black

The D.S. Arms M16 Bolt Carrier Group is a flawless upgrade for your AR15 or M16 rifle. They took their standard Mil-Spec bolt carrier group and upgraded with real-world no-nonsense features that make sense, not just make it flashy! First and foremost, they looked to their roots in the FAL Battle Rifle and incorporated L1A1 style sand cuts on all of the load-bearing surfaces of the carrier. These sand cuts allow any sand, dirt, or debris that may have gotten into the action to easily be cycled out. DS Arms machines these assemblies using the latest manufacturing techniques, materials, and finishes. The carrier is machined from 7075 T-6 Aluminum and the bolt is MPI 9310 material.

Pros:
  • Machined from 7075 T-6 Aluminum
  • MPI 9310 material
  • L1A1 style sand cuts on all of the load-bearing surfaces
  • Nitride or Nickel Teflon finish
Cons:
  • It may not be compatible with some gas systems
  • Not available in chrome-lined versions

 

10# D.S. Arms M16 Bolt Carrier Group Sand Cut Low Mas

D.S. ARMS - M16 BOLT CARRIER GROUP SAND CUT LOW MAS

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout

Finish: Nickel-Teflon

When it comes to M16 bolt carrier groups, DS Arms is at the top of the game. Their ESC – Enhanced Sand Cut complete bolt carrier group is designed for optimal function and durability. They’ve incorporated L1A1 style sand cuts on all load-bearing surfaces of the carrier, so any sand, dirt, or debris that gets into the action can easily be cycled out. Plus, the nickel Teflon finish provides an extra level of protection against corrosion and wear. If you need a top-quality bolt carrier group that will stand up to the most demanding conditions, pay attention to DS Arms.

Pros:
  • Superior quality
  • L1A1 style sand cuts for easy debris cycling
  • Nickel Teflon finish resists corrosion and wear
Cons:
  • May be overkill for less demanding applications

 

11# Radical Firearms Blackout Upper Assembly

Radical Firearms Blackout Upper Assembly

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Specification

Color: Black
Caliber: .300 AAC Blackout
Barrel Length: 16 in
Gun Model: AR-15

The Radical Firearms 300 AAC Blackout Upper Assembly is an ideal choice for anyone wishing for a top-quality, drop-in receiver that is ready to be mounted on any Mil-Spec AR-15 lower receiver. These AR15 Upper Receivers from Radical Firearms feature a forward assist for increased accuracy and a faster cool-down time. With an ejection port door, the Radical Firearms 16 in. Blackout Upper Assembly easily drops into any firearm without the need for a gunsmith. The Radical Firearms Upper Receiver Assembly is a fully mil-spec compliant receiver that provides a high-quality upper for any level budget or shooter.

Pros:
  • Forward Assist for increased accuracy
  • Faster cool-down time
  • Easily drops into any firearm without the need of a gunsmith
  • Fully mil-spec compliant receiver
Cons:
  • Faster cool-down time may not be necessary for all shooters

 

12# Aero Precision Complete Upper Receiver

Aero Precision Complete Upper Receiver

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Specification

Caliber: .300 AAC Blackout
Barrel Twist Rate: 1-7
Gun Rail: M-LOK
Gun Model: AR-15

Want to purchase a top-quality complete upper receiver? Note the Aero Precision Complete Upper Receiver – it comes with the Quantum Handguard for superior performance. Key features include built-in anti-rotation tabs, a removable 4-slot Picatinny rail section for the front sight, and a 7-mounting surface for accessories. It’s perfect for your next AR-15 build. Order today!

Pros:
  • Built-in anti-rotation tabs
  • Removable 4-slot Picatinny rail section for the front sight
  • 7 mounting surfaces for accessories
  • Forged from 7075 T6 aluminum
Cons:
  • Does not include a charging handle

 

13# Aero Precision Handguard Complete Upper Receiver

Aero Precision Handguard Complete Upper Receiver

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Specification

Caliber: .300 AAC Blackout
Barrel Length: 16 in
Barrel Twist Rate: 1-7
Gun Rail: M-LOK
Gun Model: AR-15

The Aero Precision M4E1 Threaded 16in .300 Blackout w/ Atlas S-One Handguard Complete Upper Receiver is the perfect addition to your lightweight build. The proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.

Pros:
  • The New Picatinny profile blends seamlessly with Enhanced Series Handguards
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Port door and forward assist installed
Cons:
  • May be too lightweight for some
  • Slight rail wobble

 

14# Aero Precision Blackout Barrel Complete Upper Receiver

Aero Precision Blackout Barrel Complete Upper Receiver

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Specification

Caliber: .300 AAC Blackout
Barrel Length: 16 in
Gun Model: AR-15

Would you like to upgrade to your AR-15? Think about the Aero Precision M4E1! This bad boy is equipped with a CMV medium profile barrel and Gen 2 Enhanced free-float handguards. You’ll love the fit and finish of this upper receiver, and it’s compatible with standard AR15/M4 components. It’s also been MPI and HP tested for your safety. Get more power and accuracy out of your rifle with this sweet upgrade!

Pros:
  • Precision machined to M4E1 specs
  • Comes assembled, with the port door and forward assist installed
  • The handguard mounting platform is forged into the receiver
  • Works with Aero Precision handguards but also fits most BAR-system handguards
Cons:
  • The barrel is not made of stainless steel
  • A handguard mounting platform is forged into the receiver, preventing the use of other handguards

 

How to clean?🛠️

A bolt carrier group (BCG) is an integral part of the firearm. As such, it needs to be kept in top condition for optimal performance. To ensure that your BCG is always running at its best, regular cleaning and maintenance should be carried out.

📌 To clean your BCG, you will need a few items: solvent, lubricant, a toothbrush or bore brush, cotton swabs/patches, and any other tools necessary for disassembling your BCG. 

  • ➡️ Start by removing all parts from the BCG – buffer tube assembly and charging handle– then wipe down with the solvent and toothbrush/bore brush to remove dirt and debris.
  • ➡️ Once all visible residue has been removed, apply a thin layer of lubricant to all surfaces before reassembling.
  • ➡️ When reassembling, ensure that all screws and pins are tightened to the correct torque specifications and that all gas rings are replaced with new ones if necessary.
  • ➡️ Once everything is back in place, wipe down any excess lube with a dry rag. This will help keep your BCG in top condition for many years to come.

FAQ🧐

How to oil a bolt carrier group?

One of the most important maintenance tasks is oiling the bolt carrier group (BCG). This is a critical part of firearm maintenance that should never be overlooked. 

🔰 To properly oil it, you’ll need two things: oil and cleaning cloths. 

  • ✳️ Start by using a clean cloth to remove any dirt and debris from your BCG.
  • ✳️ Once the surface is dry, apply a small amount of oil directly onto it.
  • ✳️ Rub it in evenly and make sure all surfaces are adequately lubricated.
  • ✳️ Finally, use an additional clean cloth to wipe off any excess oil.

More info in this video:

Will a 5.56 BCG work with 300 Blackouts?

The quick answer is yes, a 5.56 BCG will work with 300 BLK.

However, there are a few things to keep in mind when using:

  • ✔️ First, the 5.56 BCG is designed for use with smaller diameter rounds. As such, it may not be as durable as a BCG specifically designed for use with 300 Blackout rounds.
  • ✔️ Second, the 5.56 BCG may not provide as much gas pressure to cycle the action of your firearm as a BCG designed specifically for use with 300 Blackout rounds.
  • ✔️ And third, the 5.56 BCG may not provide as much friction to engage the rifling of your 300 blackout barrel as a BCG designed specifically for use with 300 Blackout rounds.

More info in the video:

What is so special about 300 Blackout?
It is a very popular caliber for AR-15 rifles and a great choice for both self-defense and hunting applications.

  • ✅ The main benefit – is that it can be fired in both semi-automatic and fully automatic weapons.
  • ✅ Additionally, it can be used with a suppressor to reduce the noise signature.
Is 300 AAC and 300 Blackout the same?
300 AAC and 300 Blackout are two different types of ammunition. While they may look the same, they are not interchangeable.

  • ➡️ 300 AAC is designed for use in AR-15 rifles, while 300 Blackout is designed for use in AR-15 pistols.
Is 300 BLK good for long-range?
  • 🤩 It is a good choice for long-range applications. It is a very accurate and versatile round that is popular among competitive shooters.
What's more powerful 5.56 or 300 Blackout?
  • 🔵 There is no clear winner between them, both cartridges have their advantages and disadvantages. 5.56 is generally more accurate, while 300 Blackout has more stopping power. It depends on what you’re looking for in a cartridge.

More info in the video:

Conclusion😊

BCG For 300 Blackout is a great choice for anyone looking to purchase a BCG. They are important parts of any AR-15 build and choosing the right one can be difficult. We hope that this article has helped you make an informed decision about the best bolt carrier group for your needs. Thanks for reading!😉

 

Tags: #best bcg for 300 blackout / #best bcg for 300 blackout sbr / #best bcg for 300 blackout suppressed / #best bcg for pistol 300 blackout / #best bcg for subsonic 300 blackout

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Joe Parker
Joe Parker
8 hours ago

I recently acquired a 10.5″ 300blk upper and plan to use it on the same lower as your 16″ 556 and 10″ 9mm. I have been using a 5.5oz buffer and standard carbine spring for both of those guns so far, but found a good deal on a lightweight BCG and am wondering if it would work with the combination or if you should instead opt for a full mass BCG.

Victoria
Victoria
Editor
Reply to  Joe Parker
8 hours ago

✅ For optimal performance, the .300BLK should generally be under-gassed and feature a pistol-length gas system with a full-bore gas port. To ensure reliable cycling, a lighter BCG and buffer should be utilized.

Emerald
Emerald
Reply to  Joe Parker
8 hours ago

A 5.5oz buffer would create problems when used with a full mass BCG, so the better option is to utilize a lightweight BCG and an adjustable gas block.

Jackdaniel
Jackdaniel
Reply to  Joe Parker
8 hours ago

I have been using a standard buffer weight and spring with reliable cycling of my 230gr cast subsonic bullets in .300 BLK, which I accomplish by getting around 10.3gr of IMR 4227 in the case, considering the 10.5″ barrel with pistol length gas and unsuppressed shooting setup. Although the adjustable gas block is not a requirement, it never hurts to use one, and it is important to remember that without an SBR on the lower, a brace will be needed instead of stock to avoid unwanted attention from the ATF.

Brent Evans
Brent Evans
8 hours ago

As I am about to embark on my very first build, I have been sourcing and comparing parts and respective prices. Currently, I am leaning toward a BCM MPI auto; however, I would appreciate any other recommendations.

Ronin55
Ronin55
Reply to  Brent Evans
8 hours ago

Primary Arms is currently offering the BCG, which is considered to be better than a standard BCG for SBRs due to its ability to direct more gas away from your face.

DemonicJ
DemonicJ
8 hours ago

In regards to using a BCG on a blackout semi-automatic rifle, is there any advantage to utilizing something other than a standard-weight BCG? The majority of the shooting will be done with supersonic rounds, but occasionally subsonic loading will be involved and all of the shootings will be suppressed.

Allen Olson
Allen Olson
Reply to  DemonicJ
8 hours ago

I run a standard-weight BCG in both of my black rifles. The short barrel has a pistol-length gas system, and it works great. I had to do some fine-tuning on the carbine length system in my rifle to get it to run everything from supers when suppressed to subs without any suppression. Though I haven’t been able to get it to work with subsonic unsuppressed, that’s not something I would want to do anyway. Tuning for me meant adjusting the spring for all other settings, and full disclosure – I don’t have an adjustable gas block on this gun.