June, 14

AR 15 Buffer Tube Thread Size: The Ultimate Guide for Gun Enthusiasts

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AR-15 is a popular rifle for many gun enthusiasts. It has been known to be versatile, easy to maintain, and highly customizable. One of the key components of the AR-15 is the buffer tube. The buffer tube plays an important role in controlling recoil and providing a place for the stock to attach.

However, when it comes to choosing the right buffer tube for your AR-15 build or upgrade project, one critical factor that should not be overlooked is thread size. This brings us to our keyword: AR 15 Buffer Tube Thread Size.

In this article, we will explore everything you need to know about this particular aspect of building or upgrading your AR-15 rifle. We will delve deeper into why thread size matters and how it can impact your shooting experience with this firearm. So whether you're new or experienced with building and customizing firearms like the AR-15, keep reading as we cover all there is to know about matching up thread sizes between buffer tubes and receivers on these rifles!

AR 15 Buffer Tube Thread Size: What You Need to Know

When it comes to building or upgrading an AR-15, the buffer tube and its thread size is an important factor that many gun enthusiasts overlook. This small component of the AR-15 plays a crucial role in how your firearm functions and fits together.

Overview of the AR 15 Buffer Tube

The buffer tube is responsible for holding the action spring assembly in place, which drives the bolt carrier group (BCG). It also houses part of the recoil system which helps manage felt recoil.

The buffer tube typically comes in two sizes – commercial and mil-spec. The difference between these two sizes is primarily their outer diameter. The mil-spec option has a slightly smaller diameter than its commercial counterpart.

Understanding Thread Size

Thread size refers to both inner and outer dimensions on threaded parts such as screws or bolts. In this case we are referring specifically to buffer tubes for AR-15s.

AR-15s have either a standard 1 3/16"-16 thread or a metric M4 thread. These two threads are not interchangeable due to their different diameters, so it’s crucial you know which one your rifle requires before purchasing any components.

To determine which thread size you need, consult with your manufacturer’s instructions or refer directly to your rifle itself. Most manufacturers will specify whether they use standard threads or metric threads on their rifles' receivers.

Comparison: Standard vs Metric Threads

Standard AT (American National) threads have been around since before World War I while Metric Threads were developed after World War II by countries like Japan who wanted standardized screw threading across borders.

Standards Diameter Pitch
American Standard Taper Pipe Thread aka NPT variable variable
Unified Fine aka UNF .0600" .0136"
Unified Coarse aka UNC .0600" .1000"
Metric Thread System variable variable

While both threads serve the same purpose, they have subtle differences in terms of their measurement system and how they are applied.

The standard thread is measured in inches and its pitch is determined by the number of threads per inch. On the other hand, metric threads use a completely different measuring system that involves measuring thread pitch by millimeters.

Benefits of Understanding Your AR-15’s Buffer Tube Thread Size

Knowing your AR-15 buffer tube's thread size can help you source components more accurately when building or upgrading your rifle.

It also ensures compatibility between components like stocks, receiver extensions, and buffer assemblies which could otherwise cause issues with fitment or function.

Tips for Choosing a Buffer Tube

When purchasing an AR-15 buffer tube for your rifle build or upgrade it’s essential to know which type of thread you need to avoid any compatibility issues as previously mentioned.

Another consideration should be whether you want a commercial diameter (1.17”) or mil-spec diameter (.223”). Though you may not notice much difference between these dimensions when handling the rifle, it could make all the difference in ensuring that parts fit together properly.


In conclusion, understanding what type of buffer tube and its corresponding threading requirements are necessary for an optimal functioning AR-15 build is crucial.

Whether it be sourcing new parts correctly during upgrades or just knowing how everything fits together beforehand so there aren't any last-minute surprises – this knowledge will save time on future repairs if done right from day one!


What is the thread size for an AR-15 buffer tube?

The thread size for the AR-15 buffer tube is a common question asked by many gun enthusiasts. The answer to this question is that it depends on the type of AR-15 you have. There are two main types of threads used on an AR-15 buffer tube: Mil-Spec and Commercial.

The Mil-Spec buffer tubes use a 1.14-inch diameter with 18 threads per inch, which makes them compatible with most standard-sized stocks in the market today. On the other hand, commercial buffers typically use a smaller diameter of around 1.17 inches with fewer threads per inch (16 TPI), which can cause compatibility issues when using different types of stocks.

It's important to know your specific rifle's thread size before purchasing any stock or modification parts to ensure they are compatible and work correctly together.

Can I mix and match different brands of buffer tubes and stocks?

Mixing and matching different brands can be tricky as there may be compatibility issues due to differences in dimensions, materials used, or tolerances between manufacturers' products.

It’s recommended that you stick with one brand when purchasing both your stock and buffer tube as they will generally have consistent measurements across their products providing better compatibility between them. However, if you do decide to mix-and-match components from various companies then make sure double-checking each item’s specifications carefully so that all parts fit snugly together without any wobbling or slop.

Also note that some aftermarket components may not fit well onto OEM rifles due specifically designed tolerance levels for each part component at manufacturing level &/or variances occurring over time as these weapons undergo repeated usage & maintenance activities

How do I install an AR-15 Buffer Tube?

Installing an ar 15 Buffer Tube requires some basic knowledge about how rifle assembly works since it involves dismantling certain pieces within its structure first before installing the new buffer tube.

First, you’ll need to remove your gun’s upper and lower receivers. Then, remove the existing buffer tube by unscrewing it from the receiver extension (if replacing) or if installing for first time, this may require some further disassembly of other rifle components depending on specific model being worked upon.

Afterward , insert your new buffer tube into its designated spot on top of the receiver extension until it's snugly seated in place. Use a wrench to screw in any screws that secure both components together. Finally attach stock onto newly installed AR-15 Buffer Tube

What are some benefits of using an adjustable buffer system?

An adjustable AR-15 Buffer System allows for greater customization and control over weapon performance compared to traditional fixed-buffer systems which have less flexibility available when users want tweaking such as changes related recoil functionality & shooting stability .

One significant benefit is that it can reduce recoil – thus reducing shooter fatigue and allowing faster target acquisition especially during rapid-fire situations.

Another advantage is that you can fine-tune how much gas is released with each shot fired which influences cycling rates per round; providing more consistent operation across different ammo types or loads with varying velocities

In addition, being able adjust overall length-of-pull facilitates better fitting stocks based on personal measurements/requirements so they suit individual body types making them easier operate comfortably

Is there anything I should consider before upgrading my ar 15 Buffer Tube?

Before upgrading an AR-15 Buffer Tube there are several factors one must take into account such as compatibility with other components like lower receivers or stocks since these parts use different threading standards which vary between most brands/models available today

It helps ensure all parts purchased fit properly so they work correctly together without any issues arising down line . Additionally make sure upgrade provides suitable improvement(s) desired by user while not compromising quality / reliability their firearm offers now especially where safety concerns might be involved

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