adjustable gas block ar-15

Best Adjustable Gas Blocks

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The gas block on most AR-15s is fixed. This means that no matter what ammo you use or what settings you have on your gun, the gas tube will allow the same amount of gas to enter. If you utilize a different weight BCG, suppressor, or buffer, this has obvious drawbacks. The fixed gas block is optimized for one of an unlimited number of settings by only allowing a particular amount of gas through. However, if you get yourself an adjustable gas block you can fine-tune the release of gas to fit your build.

Top Pick
Superlative Arms
  • 416 stainless steel, Melonite, QPQ
  • Barrel 0.625”, 0.750”, 0.875”, 0.936”
  • 1.34 ounces to 1.84 ounces, length 1.00”
  • Has a higher hole than standard gas blocks, requiring you to bend the tube to fit your firearm
$89 Shop NowClick to read my review
Best Budget Buy
Ohhunt Aluminium or Steel Adjustable .750''
  • Steel / Aluminum, Matte black
  • Barrel 0.750”
  • 1.05 ounces, length 0.93 inch
  • Has a low profile design
  • Easy to install and clean
  • Finish is not nicely done
$29 Shop NowClick to read my review
Odin Works .750
  • Carbon steel, Nitride
  • Barrel 0.750”
  • 2.10 ounces, length 1.00”
  • Available in clamp-on and set screw version
  • Versatile and has 20 audible adjustment points
  • Not for pistol length gas systems and high pressure rounds
$84 Shop NowClick to read my review
Seekins Precision Low Profile
  • Carbon steel, Nitride
  • Barrel 0.750”
  • 2.10 ounces, length 1.00”
  • Equipped with a low profile design
  • Melonite Coated to reduce wear and tear for long periods of firing
  • Gas block roll pin is not included in the package
$45 Shop NowClick to read my review
Ergo Low Profile Adjustable Gas Block .750
  • 4140 Chromoly Steel, Nitride/Melonite QPQ
  • Barrel 0.750”
  • 2 ounces
  • Fit most free float handguards
  • Set screw included for secure attachment
  • Does not come with gas block roll-pins
$53 Shop NowClick to read my review

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What You Should Look For in An Adjustable Gas Block

Size

Kind of obvious, but sometimes forgotten, get a gas block that fits your barrel. Also, get one that is not too heavy to keep the overall weight down and the balance of your weapon intact.

Materials

This depends on what kind of build you are aiming for your rifle. It also impacts on weight and durability. I would like to highlight aluminum, stainless steel, and titanium as my top 3 materials.

  • Aluminum: Lightweight but not as strong and resistant to heat as steel.
  • Stainless steel: Stronger, resistant to heat and rust.
  • Titanium: The strongest material in this list, and it weighs half the weight of steel. However, it is expensive.

Other than that gas blocks are pretty straightforward parts, so without further ado, let’s get into the top 5 adjustable gas blocks for your rifle.

The 5 Best Adjustable Gas Blocks

Superlative Arms Adjustable Gas Block

Gas Block Material416 stainless steel
FinishMelonite, QPQ
Barrel Dimeter0.625", 0.750", 0.875", 0.936"
Weight1.34 ounces to 1.84 ounces
Length1 inch
Attachment TypeSolid
Gas Adjustment(Patented) 30 locked positions, front of block
Bleed Off Port(Patented) Front of block, which vents forward away from operator
MSRP$99.99

The Superlative Arms adjustable gas block has a ”bleed-off” mechanism. It regulates the gas flow by sapping unwanted gas by allowing it through a bleed-off hole instead of restricting it.

Superlative Arms provides both the clamp-on and set screw style adjustable gas block. You can get them in any barrel size, anywhere from 0.625 of an inch up to a heavy barrel of 0.936 of an inch. It’s made from 416 stainless steel and with either a melonite or quench polish quench (QPQ) finish. It approximately weighs around 1.4 ounces and has 30 lock adjustable positions.

To tune your rifle with this gas block, all you need is the long Allen wrench that comes with the product. Here’s a video to show you how to do it:

Pros
  • Has a ”bleed-off” mechanism
  • Helps reduce recoil
  • Has a clicking detent sound
  • Has a built-in safety mechanism
  • Includes a long Allen wrench for convenient adjusting
Cons
  • Has a higher hole than standard gas blocks, requiring you to bend the tube to fit your firearm

Ohhunt Aluminium or Steel Adjustable .750” Gas Block

Gas Block MaterialSteel/ aluminum
FinishMatte black
Barrel Diameter0.750"
Weight1.05 ounces
Length0.93 inch
MSRP$29

The next one on our list is a low-profile aluminum gas block from Ohhunt. I have tested this gas block and had no issue with it even after 60 rounds. It also wears a matte black finish and weighs around 1.05 ounces. You can get this low-profile gas block at any large market at an amazing price of $29.

Pros
  • Affordable price
  • Has a low profile design
  • Easy to install and clean
Cons
  • Finish is not nicely done

Odin Works .750″ Adjustable Low Profile Gas Block

Gas Block MaterialCarbon steel
FinishNitride
Barrel Diameter0.750"
Weight2.10 ounces
Length1 inch
MSRP$89

The Odin Works adjustable gas block has 20 adjustment points providing you with enough options to find the ideal setting for your AR-15.

It is quick and easy to install. In addition, it has adjustable detent screws facing forward. You don’t need to remove the handguard, all you need to do is to reach through the handguard and tune it using an Allen wrench. Moreover, it’s made from carbon steel with a nitride finish. It weighs approximately 2.10 ounces and has 20 audible adjustment clicks. This model is available at most large markets for as low as $85.99.

Pros
  • Available in clamp-on and set screw version
  • Versatile and has 20 audible adjustment points
  • Easy to install and adjust
  • Excellent fit
  • Brilliant machining with rounded corners
  • Comes with cross pin, detent ball, hex wrenches, and set screws
Cons
  • Not for pistol length gas systems and high pressure rounds

Seekins Precision Low Profile Adjustable Gas Block

Gas Block MaterialCarbon steel
FinishNitride
Barrel Diameter0.750"
Weight2.1 ounces
Length1 inch
MSRP$59

Are you looking to get an affordable low-profile gas blocker for your rifle? Then the Seekins Precision gas block is great for you.

Seekins Precision allows adjusting your rifle’s gas system. Hence, giving you a more even cycling and slicker performance. You can also use this in a suppressed or unsuppressed setting. The front of the gas block has a jam screw that locks your gas key in place at your desired adjustment using an Allen wrench. It also fits with a barrel size of 0.750 an inch. Additionally, it’s made from carbon steel with a nitride finish and weighs about 2.10 ounces.

It is easy to adjust and operate. It also has a twist to regulate the amount of gas that enters the gas tube. Furthermore, it has a melonite finish for optimum durability and corrosion resistance. So, if you are looking for a regular low-profile gas block that does its job very well, the Seekins Precision is your best option as a go-to gas block for your rifle.

Pros
  • Comes in an affordable price for its quality
  • Easy to adjust and clean
  • Equipped with a low profile design
  • Melonite Coated to reduce wear and tear for long periods of firing
Cons
  • Gas block roll pin is not included in the package

Ergo Low Profile Adjustable Gas Block .750

Gas Block Material4140 Chromoly Steel
FinishNitride/Melonite QPQ
Barrel Diameter0.750''
Weight2 ounces
MSRP$53.99

For the last one on our list, we have the Ergo Low Profile Adjustable Gas Block. This adjustable gas block is made to fit most free float handguards from other manufacturers. It has a set-screw that allows you to fine-tune the amount of gas allowed to pass through the system for load-specific applications. It lets the user adjust the gas system on their rifle all the way to full shutoff. In addition, it accepts normal gas block roll-pins but does not come with one.

In addition, this adjustable gas block is constructed of 4140 Chromoly steel and is compatible with Superlite Rail Systems.

Pros
  • Durable construction
  • Nitride/Melonite QPQ finish
  • Fit most free float handguards
  • Set screw included for secure attachment
  • Easy to adjust
Cons
  • Does not come with gas block roll-pins

Conclusion

Each of the products mentioned above excels in different aspects. They are all reliable and durable, capable of taking your shooting experience to another level.

But what I like the most is the Superlative Arms Adjustable Gas Block. It ticks all the boxes on our list of what we should look for in an adjustable gas block. Additionally, its ”bleed-off” mechanism, and how it deters the accumulation of carbon residue won us over.

Our best budget buy is the Ohhunt Adjustable Gas Block. It comes in either aluminum or steel and comes at an affordable price.

Now, do you know which survival rifles are reliable when faced with stuff-hits-the-fan (SHTF) scenarios? Go ahead and read our article about the 7 Best Survival Rifles.

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  1. WOW. When buying the parts to build my AR15 pistol, I was given 2 options: long barrel or short barrel. It was my first project. I am still learning

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