Finding the best gas block for AR-15 may be a challenge. That's because you'll see a ton of them flooding the market. Another issue is that there's a lot of them that are considered cheap and low quality. The last thing you want to do is find one that will last you a couple of months and then quit on you after that. Then it's back to spending more money on another one. You'll need one that will last you a long time and won't let you down each time you use your AR-15. We've handpicked five of the best AR-15 gas blocks (including Adjustable and Non-Adjustable) that are currently on the market right now.
Things To Consider When Buying An AR-15 Gas Block
Before making a decision on finding the best gas block for your AR-15, you’ll need to consider some of the features and factors that will drive you to make a final decision. Here are some things that past buyers have considered prior to purchasing a gas block of their own:
Gas barrels come in different sizes. Finding the right one will depend on the size of your barrel. Most typical medium barrel profiles will have a diameter of .750”. If you have a gun with a heavy bull barrel, typically the best available diameter is .936”. If you have a smaller barrel or a pencil barrel, obviously the diameter measurement is .625”.
There is no one attachment method for an AR-15 gas block. One of them is a clamp on attachment. However, another common mounting type is slipping the block down the barrel and fixing it in place with setscrews on the underside.
If you’re planning on installing a free-float handguard to enhance the accuracy of your rifle, then you’ll want a low profile gas block. This type of gas block is compact and disappears underneath long free-floating handguard and the rail system.
Most gas block materials are made of steel. There are different types of steel that are used depending on the manufacturer. Typically, carbon steel is one of the most durable types of steel. So, if a gas block is crafted from this kind of material, there's a good chance it will last you a long time. You'll need a gas block that will sustain a lot of rounds over time.
Review Of Best Gas Blocks For AR-15
SGB Geissele Super Gas Block
Geissele is one of the most recognizable brand names for AR-15 owners and enthusiasts. That’s because they’re best known for offering the best triggers on the market. Not to be outdone, they’ve also been busy manufacturing gas blocks as well. This is a non-adjustable, low-profile gas block that is made from 17-4 stainless steel. It is intended to tightly fit around a .750-inch diameter barrel that is found on most AR-15s.
The SGB comes with two possible mounting solutions. One is a standard one for the casual and target range shooter. The second is the “bombproof” installation. This is designed for duty weapons and combat weapon situations. At the same time, it provides a new level of security for these types of AR-15s.
If you want the mounting process to be simple, obviously you'll need to opt for the standard option. If you want to go "bombproof", this will require a little more skill. In other words, if you have some gunsmithing skills, then you will find the task not so difficult to do.
This gas block is not only available in a stainless steel finish, but it is also available in a black matte finish as well.
- All-steel construction for super strength and resistance from corrosion.
- .750” OD barrel.
- Comes in two mounting solutions.
- Easy to assemble and disassemble.
- Very sturdy.
- Matches great with most AR-15s.
- Gunsmithing is required for “bombproof” mounting.
- The stainless steel gas block may have some issues in terms of the tight fitting.
- Some sanding may be needed if the fitting will be an issue.
The Bottom Line
Geissele does not disappoint here. If you want a good gas block that will go well with your AR-15, this one might be worth looking into. If you're a casual shooter, it's easy to mount. This, of course, is assuming that your AR-15 is for target shooting. The steel construction makes this a very durable gas block and can sustain a lot of rounds. So, if you're looking for a gas block that will last you a long period of time, the Geissele won't disappoint you.
ODIN Works - AR-15 Low Profile Gas Block
This gas block is manufactured from carbon steel and superalloys. So right off the bat, you know that this is going to be one tough gas block. One of the superalloys that is used is called Inconel. This makes the gas block resistant to high pressure and heat. Believe it or not, Inconel is a superalloy developed in the aerospace industry.
The ODIN Works utilizes a front-facing Inconel adjustment screw and spring to make sure that the gas system is properly functioning. This features 20 adjustment points and can be tuned for silencer usage or weak/hot loads. This fits .750” diameter barrels and can be installed as easily like all other low profile gas blocks. This is secured to the barrel with two setscrews on the lower side. If you’re worried about dimpling the barrel, there is a clamp on version of this gas block that is available.
- Fits .750” barrels.
- Crafted from carbon steel, Inconel, and other superalloys.
- Has 20 adjustment points of weak and hot loads.
- Excellent design.
- Fits most rail systems and handguards.
- Very easy to adjust.
- If you have a smaller handguard, you may run into issues.
- Not usable for pistol length gas systems.
- One reviewer said that it may be a little too fat for some barrels.
The Bottom Line
If you’re looking for the strongest gas block for your AR-15, the ODIN Works may just be the one for you. For something to be made from materials used by NASA, it is bound to be the toughest on the market. Before choosing something like the ODIN Works, the main thing to consider is the size of your current handguard. If it is smaller than normal, then you may want to find another gas block.
JP Enterprises AR-15/M16 Adjustable Gas Block
Next up is the JP Enterprises adjustable gas block for AR-15s and M16s. This is an American manufactured gas block, so you know for sure that it has met a lot of strict standards in terms of quality. They are also focused more on the competitive shooting market. So, if you’re looking for a gas block and use your AR-15 for the purpose of target practicing or competitive shooting, you might want to consider this one.
This gas block is produced from lightweight 6061 T6 aluminum or rugged 416 stainless steel for additional muzzle weight. These are intended to mount underneath the many of the AR-15 handguards that are currently on the market. Aside from the standard clamp on design, this also has a two-piece model that allows for easier installation on barrels with pin-and-weld muzzle devices.
The “clamp style” model is attached with four hex-head setscrews instead of the usual two. To clamp the block securely to the barrel, you’ll need some Loctite for each screw. The JP Adjustable Gas System offers easy access to the side gas adjustment and internally retained detent components. If you worry about lost parts, you won’t have to worry anymore of the JP.
Because JP gas blocks are much bigger than other low-profile blocks, they require you to choose a shorter handguard. You’ll still be able to attach accessories to the rails.
- Crafted from 6061 T6 aluminum or rugged 416 stainless steel.
- Clamp style model.
- Adjustable gas system for easy access to the side gas adjustment.
- Easy, but not too complex to install.
- Stout and very solid.
- Very durable.
- May interfere with some handguards.
- You may need a gunsmith to install this if you find the installation process intimidating.
- May not fit with most handguards.
The Bottom Line
A lot of AR-15 gun owners and enthusiasts alike trust brands like JP Enterprises for manufacturing durable, long-lasting products. This gas block proves their point. If you want something that is not so low profile compared to other gas blocks, then the JP may be your favorite gas block of them all. This is also for those who don't mind the installation process to be a little challenging. The good news is, you may not need a ridiculous amount of gunsmithing to install this gas block.
VLTOR Weapons System - AR-15 Gas Block Low Profile
This is a slim replacement for classic fixed-sight tower models. It also presents a carefully-assembled gas management system. The VLTOR low-profile models are tiny, compact, and keep the weight down. If you have an ultralight build or if you’re using a handguard that is mounted over the whole gas system, this gas block might be the one you’ll want.
Aside from fitting a .750” diameter of standard barrels, this one is made to fit lightweight barrels that feature a .625” diameter or pencil barrels. The VLTOR is machined from 17-4PH stainless steel and 4140 carbon steel. They are available in two different finished: stainless steel or matte black. This also comes with two methods of attachment. You can choose to have a more conventional screw-on option with setscrews on the bottom or a clamp on model that squeezes around the barrel.
If you choose the clamp on model, remember that it won’t fit under an exposed bottom rail channel on the inside of the handguard.
- Crafted from 17-4PH stainless steel and 4140 carbon steel.
- Comes in two finishes: stainless steel or matte black phosphate.
- Fits perfectly with ultralight builds.
- Fits most regular sized and pencil barrels.
- Very durable and super strong.
- Screw on is the easiest of the installation options.
- Since it covers one inch of the barrel, you’ll have a silver taper pin hole showing where the front post sight was. This is an aesthetics issue.
- Some filing may be needed.
- May not fit inside some handguards.
The Bottom Line
While it’s a slim gas block, it’s perfect for AR-15s with smaller barrels. If you own one of those types of guns, then you’ll probably want the VLTOR as your gas block of choice. Of the low profile gas blocks currently available, this is probably the lowest profile of them all.
Superlative Arms LLC AR-15 Adjustable Gas Block
Our final gas block for review comes to use from Superlative Arms. If you were looking for a gas block that merges multiple gas system into one block, then chances are you've hit the jackpot. The Superlative Arms gas block is the only 3 in 1 gas block currently on the market. This has united three different types that provide you with the performance of a standard non-adjustable, a restrictive adjustable gas block, and a "bleed off" gas block.
The “bleed off” mode of this gas block is designed to bleed the excess gas out from the front of the gas block. While in the bleed off setting, you can tune your rifle to the peculiarities of the ammo and the rifle. This is an excellent gas block to have if you’re running a suppressor or using a pencil barrel.
The design of the SA allows you to shoot the rifle more softly and cleanly because the adjustment detent is placed outside of the block and contains no contamination.
- Features three types of gas systems.
- Bleed off mode for excess gas removal.
- Crafted in stainless steel or melonite.
- Very easy to install.
- Adjustable without moving the handguard.
- No noticeable loss of velocity.
- May be a little bit on the tall side.
- May limit your options on handguards.
- Bleed off mode may need some improvements. But since it’s a new feature, it’s a start.
The Bottom Line
This is the kind of gas block that might have been impossible to design or manufacture. But SA took the time to create this and it may become one of the most popular gas blocks on the market. The bleed mode is a convenient feature for those who have a hard time removing the excess gas. While there may be some important changes coming down the pipeline, it never hurts to get this gas block so you can get a feel of how it works. If you’re satisfied, you might be happy with the improvements that may come along in the future.
How to install Gas Block for AR-15
Finding the best gas block for AR-15 is easy if you know what you’re looking for. With that in mind, look over each gas block again carefully. Take note of one of the unique features that you like and determine whether or not if it will benefit you personally. If you already have a gas block in mind, be sure to do some due diligence and learn more about the gas block you want to purchase.