Troy Defense M5 9mm Carbine right side

Best 9mm AR Buffers

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A buffer is a metal piece located inside the buffer tube in the stock. It’s designed to absorb a lot of the recoil from an AR. If you want to make your AR easier to shoot with less recoil, getting one of the best 9mm AR buffers is ideal.

Luckily, we have here a list of the best 9mm AR buffers available in the market today. Now, let’s begin.

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Pros and Cons of a 9mm AR

  • You can share the same ammunition, and sometimes even the same magazines, as your handgun. If you have your AR9 and a Glock 34, 17, or 19, you can use the same magazines across both weapons. This greatly simplifies your tactical setup.
  • It produces a lot less recoil than an AR-15 that shoots rifle ammunition. As a result, it permits faster follow-up shots and lends itself to an easier shooting experience.
  • It makes shooting easy.Women or smaller-statured people in particular should have a much easier time shooting an AR9.
  • An effective home defense weapon. An AR-9 is much more compact than a carbine that shoots centerfire ammunition, and will therefore be more nimble and agile in tight conditions. The 9mm round also creates less noise than rifle rounds such as the 5.56, which will be less disorienting in the tight confines of a home.
  • It can be used as a truck gun. It’s compact and light design makes it possible to stash it away in the backpack along with spare magazines and other tactical equipment. You can then keep the backpack under a car seat or in another compartment, and then when you need to evacuate your vehicle in an emergency scenario you can just take the backpack with you.
  • Less range and power. The 9mm round has drastically less range and power than a standard 5.56x45mm NATO round. While the 5.56 can be used for hunting purposes for medium game, the 9mm is generally not well suited for this role. If you want an AR that can tap targets at longer ranges, the 9mm round is not the best caliber to choose.

An AR9 can make an excellent addition to your gun collection. It serves a unique role as a short to mid range tactical weapon that can share the common magazines and ammunition as your handgun.

Even though an AR9 already produces minimal recoil, one of the best ways to reduce the recoil of your AR9 even further and to ensure an overall smoother operation will be to upgrade the buffer. But what is the buffer in the first place? That’s what we’re going to discuss next.

What is an AR Buffer?

The buffer is a small part that is located inside the buffer tube. It buffer can move around in the presence of the buffer spring, which is also located inside the buffer tube. The buffer tube is attached to the stock of your AR-15, at least in the case of carbines and rifles.

The purpose of the buffer is to make your AR fire more effectively. It absorbs a lot of the recoil and shock when you fire the weapon, which delivers less of a kick into your shoulder. Without the buffer, the energy of the weapon firing would be too excessive for the spring located inside the buffer tube, and it would eventually break apart.

A standard buffer consists of an aluminum casing, which houses the weights of the buffer inside. Buffer weights are usually built out of steel, and are separated by rubber pads. This helps to reduce recoil and the shock of recoil energy transferred to the buffer tube by the bolt carrier group. The end of the buffer is usually built out of durable and high-impact plastic, and is held in place with a retaining pin.

It’s also important that your AR9 buffer is designed properly. A buffer that is too light will do little to nothing to lower recoil, and can also inflict greater wear on your 9mm AR lower receiver, parts kit, and the bolt.

The bolt could even unlock early from a light buffer, which could result in a casing becoming stuck. On the other hand, a buffer that is too heavy can also run into problems, most notably including short strokes, jams, and feeding issues.

AR Buffer Weight Classes

With this in mind, all AR buffers can be divided into the following weight classes:

  • Carbine
  • Heavy
  • H2
  • H3
  • HSS
  • XH

Out of these six, Carbine, Heavy, and H2 buffers are by way and large the most common. A carbine buffer weighs around three ounces and consists of three steel weights, and is an ideal choice for a .223 or 5.56 AR carbine or mid-length gas system.

The Heavy buffer (or H buffer) will normally weigh just under four ounces. The heavy buffer is likewise best used in a carbine or mid-length gas system shooting rifle rounds.

Finally, the H2 style of buffer is the heaviest, and weigh around 4.7 ounces. It should consist of four tungsten parts, and is an ideal choice for an AR pistol in either the 5.56 or 9mm rounds.

Buyer’s Guide to the Best 9mm AR Buffers

Before you buy a buffer, here are the most important factors to consider when looking for a new buffer for your 9mm AR.

Materials Quality

Almost all buffers are built out of steel or aluminum, which is a good material for resisting recoil and absorbing the shock that comes along with it. Steel is tougher and more durable, but aluminum can hold up well on its own and is also much lighter in weight.

As noted, the internals of the buffer are usually built out of steel, and are separated by rubber pads to further mitigate the shock the recoil. The rubber also helps to reduce the wear inflicted on other parts.

When it comes to the buffer sprig, stainless steel is your best bet. It’s durable, long lasting, and very rust and corrosion resistant as well.


The cost will matter a lot to you if you’re on a budget. The good news is that most buffers are not terribly expensive, and you shouldn’t expect to have to pay more than around fifty dollars for one. That being said, the higher end buffers can cost well over a hundred dollars. The best strategy is to pre-determine what your budget is and then buy accordingly.

Fit: Does It Fit In Your Buffer Tube?

This is a big one. You absolutely must make sure that your buffer is designed to fit in your buffer tube. The best approach is to measure your buffer tube while looking for a good replacement buffer.

If you do not yet have a buffer tube because you are building a new AR-9 from the ground up, the best strategy is to purchase the buffer tube and buffer together and confirm before you purchase that they can fit together.

Another option is to purchase a lower receiver assembly that comes with both the buffer and buffer tube. Then again, the whole point to purchasing a new buffer is to reduce shock and recoil from your AR-15 and to smooth out the operation, and the buffer that comes on your assembly may be a standard model. Again, you just have to make sure that your buffer and buffer tube of choice can fit together.

System Type: Pistol Gas System or Carbine Gas System?

Before you purchase a buffer, you need to find out if it is compatible with a carbine gas system or pistol gas system. Again, no buffers are created equally. Some are designed specifically for pistol gas systems and cannot handle a carbine, while vice versa others are designed for carbines but not for pistols. There are also other AR buffers that are designed to function in both. Research carefully before your purchase.

Features: What Parts Does It Come With?

Are you just buying the buffer itself, or are you buying a buffer kit or a buffer assembly? Pay close attention to the parts that are listed as being included in the overall package. Any parts that are missing, you’ll then need to buy separately (assuming that you do not have them already).

Speaking of kits, if you are looking into converting an existing rifle into an AR-9, check out our article on AR-15 9mm conversion kits.


The ideal weight for a buffer for a carbine will be around three ounces, and slightly more for pistol buffers (H2 buffers typically weigh around four to five ounces). A heavy buffer, on the other hand, will weigh around four ounces.

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The 3 Best 9mm AR Buffers

Now that we’ve covered why you need to upgrade your 9mm AR buffers, here are our top three choices for what you can buy today:

Strike Industries AR PDW 9mm Buffer: Best budget 9mm AR buffer

Best 9mm AR Buffers Strike Industries AR PDW 9mm Buffer

Strike Industries designed this pistol-length 9mm buffer for the AR platform specifically to improve performance. It comes equipped with the company’s PDW Stock, the PDW stabilizing brace, and additional pistol-length receiver extensions found on the majority of 9mm blowback systems.

The buffer housing is made out of steel, and it has two tungsten weights that add up to 4.6 ounces. The housing has a buffer pad composed of long-lasting NBR rubber to dampen the blowback system’s effects.

This 9mm buffer is all-inclusive since it comes with a flat wire buffer spring optimized for use with the buffer found in SI PDW systems and the majority of pistol-length buffer tubes. Also, it allows you to use a pistol-length receiver extension or the SI PDW Stock/ Stabilizer reliably on an AR 9mm build.

  • Easy to install
  • Durable construction
  • Provides flawless function on AR build
  • May be too short for some

Angstadt Arms AR-15 9mm Carbine Buffer Assembly Kit: Best value 9mm AR buffer

Angstadt Arms AR-15 9mm Carbine Buffer Assembly Kit

The Angstadt Arms AR-15 9mm Carbine Buffer Assembly Kit is designed to reduce recoil for your AR and also make the operation much smoother. This is also a very lightweight unit that will not add very much weight to your carbine, although it is also a bit longer than other buffers and springs on the market.

Besides working with AR9 carbines, the Angstadt Arms can also work well with AR-15 pistols, including those that are designed to function with Colt and Glock magazines.

Something to take note of is that the spring can be a little stiff to move initially out of the box, and you will need to shoot a few magazines before it begins to loosen up a bit.

Overall, the Angstadt is a solid choice for a buffer for your AR9. It’s very durable and designed to withstand lots of shock, and the spacer helps to enable a smoother function as well. Just make sure that you fire a few rounds in order to loosen up the spring and ensure a smooth action.

  • Durable and designed to absorb a lot of shock
  • Spacer helps enable better function
  • Easy to install
  • Lightweight design
  • Designed to function with both AR9 carbines and pistols
  • Movement can be a little stiff upon initial use; needs to be broken in

KYNTEC Corporation AR-15 9mm Hydraulic Recoil Buffer: Overall best 9mm AR buffer

Kyntec Corporation AR-15 9mm Hydraulic Recoil Buffer

The Kyntec Corporation AR-15 9mm Hydraulic Recoil Buffer is one of the more unique buffers for an AR9 out on the market. Believe it or not, it actually uses the same design as shock absorption in vehicles in order to reduce recoil. This is because the buffer utilizes a hydraulically dampened piston that helps to absorb the shock from the bolt carrier traveling to the rear when you fire the weapon.

This results in less THUMP being delivered into your shoulder and also reduces the bounce of the bolt when a new round is transported from the magazine into the chamber. This hydraulic recoil design also helps to reduce the spring noise when you fire the carbine and reduces the amount of wear that is inflicted on the internal parts of your AR, which should extend the service life. Also, this results in smoother cycling.

As an added bonus, the Kyntec is built out of very durable stainless steel, which further helps to extend its overall service life as well. It is more expensive than most other AR9 buffers out on the market, but at the same time, you get what you pay for.

The Kyntec Corporation Hydraulic Buffer utilizes a hydraulically dampened piston to help reduce recoil, ensure smoother cycling, and reduce wear inflicted on the rest of the internal buffer tube parts. It may be expensive for an AR buffer, but this proven design along with the stainless steel construction justifies the higher price.

  • Durable stainless steel construction
  • Hydraulic dampened design reduces recoil, shock, and wear on internal parts
  • Very smooth cycling
  • Very expensive for an AR buffer

Wrap Up

And that concludes our list of the top three best 9mm AR buffers. Any one of the buffers that we have covered here today will be a solid choice for your AR9, or alternatively, you can follow the buyer’s guide that we listed before to help you select another buffer as well.

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