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The Best Buffer Tubes

Generated From 25K+ Reviews!
ON SALE!Rank 1
FatCat Sports Reinforced M Spc Spring Aluminum Tube Recoil...
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Rank 2
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Pro-Ject Tube Box DS2 (Black)
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Rank 5
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Rank 6
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Buyer's Guide

Buffer Tubes Buyers Guide: What You Need To Know

In light of the fact that there is no military or law enforcement system that does not rely on firearms, it is imperative that these weapons be handled with the greatest care. Cleaning and replacing parts are only the beginning of the process of maintaining and preserving a firearm's condition and functionality. If the recoil system does not function properly at all times while the firearm is in use, the overall system's dependability will be compromised, as will the overall system's dependability. According to my observations, buffer tubes perform exceptionally well in this application. You must first understand how a buffer tube works, including its anatomy, type, and function, before you can confidently shop for a buffer tube kit. "Buffer tubes are critical in maintaining the integrity of your precious self-assembled firearm," says the author.

Buffer Tubes

What’s a buffer tube?

In your search for the perfect buffer tube as a first-time builder, you've probably come across a slew of articles that discuss "military specifications" and "commercial diameters," among other nonsense. This cylindrical aluminum housing, which is also known as a receiver extension, houses the AR-15's buffer and recoil spring, which are two of the weapon's most important components. Additionally, a buttstock or pistol brace can be attached to it to provide even more versatility to the weapon.

Two Categories of Buffer Tube

By dampening the force of recoil, the buffer tube contributes to the reduction of the shock caused by a bullet leaving a rifle or pistol. In order for the buffer tube to function properly, it must have two major components: the buffer tube and the buffer spring (or buffer spring spring). These two components work together to reduce the force of recoil on the firearm's frame, which is important for shooting accuracy. In firearms terminology, buffer tubes are grouped together with other components such as the trigger, buttstock, and magazines, which are referred to as the "lower receiver" components. Several different shapes and sizes are available for buffer tubes, which can be used in a wide range of applications across a wide range of industries.

There are two types of classifications:

Commercial Buffer Tubes

After it has been stretched to its maximum length, it has the exact same diameter as it did at its beginning point. In order to complete the assembly, no access milling is required, and the end cap is simply welded on after the thread rolling process is completed to complete the design. Available for purchase are two-piece buffer tubes with a diameter of 1.168 inches, which can be purchased from commercial suppliers.

Mil-Spec Buffer Tube

They are of the highest precision and quality available because the threads on these buffer tubes are rolled on according to the GAO's standards for military-grade components. There is 1.148 inches of outside diameter on this tube, and it was forged from a larger tube that had been milled to meet the military's specifications.

What to Consider When Purchasing

In order to improve the performance of your rifle or because these parts have become worn over time, it is possible that you will need a buffer kit installed. In addition, the selection of spring and buffer types can be used to improve the delivery and dependability of natural gas supply. The following considerations should be taken into consideration when selecting a buffer kit:

Buffer Tubes


Replacement of the sleeve and its spring will be required at some point in the future, however. Because they are hit by the bolt carrier group (BCG) with each round fired, they sustain a significant amount of physical damage.

It is recommended that you purchase a buffer and a buffer spring that are both durable and dependable if you do not want to have to read this article again in six months.

Buffer weight

In addition to ensuring smooth operation of your rifle, the buffer weight of your rifle is critical to ensuring the longevity of the components in your rifle. By adjusting the buffer weight, it is possible to slightly reduce the recoil impulse by a small margin.

When purchasing an AR-15 rifle, what amount of buffer weight do you require? When answering this question, a variety of factors are taken into consideration. These include the size of your gas port, the length of your gas system, and whether or not you intend to use a suppressor.

Buffer Length

A total of two different lengths are available for buffers: rifle and carbine. There must be a clear understanding that the two terms are not interchangeable with one another. Fixed-stock ARs are frequently equipped with standard A2 buffer tubes in order to accommodate rifle length buffers, which is a common practice. A2 rifle buffer tubes are longer than A2 carbine buffer tubes, resulting in a longer overall length for these buffers than for A2 carbine buffers.

Carbine-length buffers, on the other hand, are the best option for the vast majority of collapsible stocks that are equipped with carbine-length buffer tubes. Despite the fact that some stocks are constructed with commercial-spec carbine buffer tubes, the vast majority of stocks currently on the market are constructed with Mil-Spec carbine buffer tubes.

Buffer Springs

Despite the fact that buffer springs appear to be interchangeable, there are subtle differences between them that can have a significant impact on the performance of your gun. Despite the fact that the majority of rifle and carbine springs have the same diameter, their lengths differ. In comparison to standard carbine springs, which are approximately 10.5" in length, standard rifle springs are approximately 12.75" in length. Standard rifle springs have a total of 37 to 42 coils, with the number of coils varying depending on the manufacturer.

The majority of buffer springs rub against the inner surface of the buffer tube, resulting in a "twang" sound when the gun is discharged. This sound is caused by friction between the spring and the inner surface of the buffer tube. Reduced noise can be achieved by smoothing out the spring's surface or applying a special lubrication finish to the spring's surface.


The cost of buffer tubes is something that people who are concerned about their financial situation are aware of and take into consideration during their decision-making process. When selecting a buffer tube, it is important to consider a variety of factors in addition to the price of the tube.

Inspect the buffer tube to ensure that it has a higher quality than a standard low-cost buffer tube of similar size and shape. It is absolutely critical that you refrain from purchasing buffer tubes that are inexpensive but of poor overall quality.


Material selection for the construction of a buffer tube has a significant impact on the overall performance of the tube. Buffer tubes are frequently made from high-quality materials such as aluminum, which is why they are so popular. Aluminum alloys such as 7075-T6 are extremely popular in the aerospace industry because of their high resistance to a wide range of damage conditions.

The design of the weapon also makes it possible to absorb shock from the revolver's recoil. In addition, this aluminum will be resistant to rust and corrosion during the manufacturing process.


Buffer tubes aren't necessary if you don't have any gunsmithing experience. Unlike some other buffer tubes, the majority of the AR-10 buffer tubes listed on this page are not difficult to install. A few minutes of your time and the appropriate tools are all that are required to correctly install a buffer tube.

Final Thoughts

In terms of determining your requirements, you have complete freedom to choose either a buffer spring or a buffer weight. Buffered weights and springs are available to fit a wide range of firearms, from competition carbines to long-range AR rifles, suppressed weapons, and pistols intended for close-quarters combat.


What is a buffer tube?

The AR-15 buffer tube (also known as the receiver extension) has a metal protrusion that houses the recoil buffer mechanism and serves as a mounting point for the buttstock. This protrusion is known as the "receiver extension." The receiver extension is the term used to describe this.

How do buffer tubes work?

Using the buffer tube as a point of contact for the bolt carrier, it is possible for it to move backward within the buffer tube. Due to the fact that it is located at the back of the assembly, the spring has the ability to move backward within the buffer tube. With each round of ammunition discharged, a spring-loaded buffer and bolt carrier advance, loading the next round of ammunition and closing the bolt in preparation for another round of ammunition to be discharged.

Are the AR-15 and AR-10 buffer tubes the same?

It is necessary to have shorter and heavier rifle buffers on the AR-10 compared to the AR-15 in order to accommodate the weapon's longer bolt carrier group and the more powerful 308 round that is used in it. The inability to use them interchangeably in the same sentence is the result of this rule. Due to their universal compatibility, the buffer tubes can be used with either rifle, regardless of the length of the buffer tubes.

How important is a buffer tube?

This is a critically important aspect of AR-15 operation that must not be overlooked at all costs. The buffer spring adds additional weight to the system and acts as a buffer between the buffer spring and the bolt carrier group itself.

Can you use an AR-10 buffer on an AR-15?

In fact, the buffer springs for the AR-15 and AR308 are interchangeable, which is a good thing. It is not necessary to have an "AR10 buffer" in order to operate your AR10 rifle; all that is required is a spring to do so. It is likely that the experience will be unpleasant after only a few shots, and that the results will be inconsequential at best.

Can an AR pistol have a standard buffer tube?

The fact that constructive ownership is a possibility should not overshadow the importance of being familiar with it. It is possible to prevent the installation of a buttstock by wrapping a piece of paracord around the tube. After this step is completed, the pistol upper will be attached to the weapon by means of a screwdriver.

How long is an AR10 buffer tube?

It is one of the lightest buffer tubes available for this caliber of rifle, weighing only 4 ounces for a 7-7/8-inch AR10 Carbine Buffer Tube, making it one of the lightest buffer tubes available for this caliber of rifle.

How long is a pistol-length buffer tube?

The addition of the Strike Industries Pistol Buffer Tube functionality to personal defense weapons is a straightforward but effective way to improve the overall performance of the weapon. Generally speaking, the pistol buffer tube, which measures slightly more than 5 inches in length, helps to shorten the overall length of the pistol.

What is a commercial buffer tube?

In the AR15, the buffer spring is held in place by a housing made of aluminum that is attached to the rifle's lower receiver. The fact that they can be used to attach a buttstock or pistol brace is an added bonus, which is extremely convenient. Buffer tubes are available in a variety of shapes and sizes, and both types are effective when used in firearms.

What is an enhanced buffer tube?

The Enhanced Buffer Tube's six adjustment positions make it easier to fine-tune a stock or pistol brace than it would otherwise be. Using this buffer tube, you can make adjustments to the SBA3 or other adjustable braces that are currently in use. Additionally, this buffer tube is required for rifles that have an adjustable stock. When compared to the standard A5 size, the diameter of this buffer tube is significantly smaller.

What does a buffer tube and spring do?

Despite their straightforward design, buffer springs are critical components in the operation of a rifle. When the bolt carrier is cocked or pushed back, the buffer and buffer spring are in direct contact with the bolt carrier, causing the bolt carrier to move. After grabbing a round, the bolt carrier moves forward as a result of the movement of the bolt carrier.