July, 16

AR-15 Barrel Thread Size: A Comprehensive Guide for Gun Enthusiasts

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Are you a gun enthusiast who's curious about the AR-15 barrel thread size? If so, you've come to the right place. The AR-15 is a popular firearm known for its accuracy and versatility, but understanding its barrel thread size can be tricky.

There are many factors that come into play when it comes to determining an AR-15's barrel thread size. Different manufacturers may have different specifications, and there are also various types of barrels available in different lengths and materials. But fear not – we're here to shed some light on this topic so that you can make informed decisions when purchasing or modifying your weapon.

So if you're interested in learning more about the AR-15 barrel thread size, keep reading! We'll cover everything you need to know to understand this crucial aspect of your firearm.

AR-15 Barrel Thread Size: Everything You Need to Know

If you're a gun enthusiast or someone who's just starting out in the world of firearms, there's no doubt that you've come across the term "AR-15." This versatile rifle has become incredibly popular over the years, thanks to its reliable performance and customizable features. One important aspect of customizing an AR-15 is choosing a barrel thread size that fits your specific needs. In this article, we'll explore everything there is to know about AR-15 barrel thread sizes.

What Is an AR-15 Barrel Thread?

An AR-15 barrel thread refers to the threads on the end of a rifle barrel where attachments such as flash hiders or suppressors can be screwed in place. These threads are standardized so that different parts from various manufacturers can fit together seamlessly. Generally speaking, there are two main types of threading used for these barrels: 1/2×28 and 5/8×24.

Comparing 1/2×28 vs 5/8×24 Threads

The most commonly used thread size for an AR-15 is 1/2×28. This size works well with standard flash hiders and compensators while also allowing enough room for other attachments such as suppressors if needed. The smaller diameter allows for better control over muzzle rise during firing while still providing adequate sound reduction when using a suppressor.

On the other hand, some shooters prefer larger caliber rifles which require bigger bore diameters than what’s offered by standard .223 Remington chambering usually seen in most modern sporting rifles including those chambered specifically for hunting like .300 Blackout cartridges among others; those users will opt-in go with threaded barrels at either pitch preference i.e., 1 /2 x28 TPI or even bigger ones like (most common) .308 Winchester having more choices between their preferred calibers.

Benefits of Choosing the Right Barrel Thread Size

Choosing the right thread size for your AR-15 barrel can have a significant impact on performance. A properly threaded barrel ensures that attachments are securely fastened and aligned, which allows for consistent accuracy and better control over muzzle rise. Additionally, using the correct thread size ensures compatibility with other components, making it easier to switch out parts or make adjustments down the road.

Tips for Selecting an AR-15 Barrel Thread Size

When selecting an AR-15 barrel thread size, there are a few things to keep in mind:

  1. Consider what you'll be using your rifle for – Are you planning on using your rifle strictly for target shooting or do you plan on hunting as well? This will affect which attachments you choose and therefore determine what thread size is best suited.
  2. Check manufacturer recommendations – Certain manufacturers may recommend specific threads sizes based on their product designs.
  3. Consult with a professional gunsmith – If you're unsure about which thread size is right for your needs, speaking with an experienced gunsmith can help clarify things.


In conclusion, choosing the right AR-15 barrel thread size is crucial when it comes to customizing this popular firearm platform according to individual preferences and use cases like hunting vs sporting uses among others.. Whether you’ll go with 1/2×28 or 5/8×24 threading depends largely upon factors such as personal preference regarding bore diameter along caliber choice but also usage demands dictated by intended purposes e.g., recreational range plinking versus precision shots taken during competition events; however making sure all components match up correctly ensures optimal performance while improving safety too!


What is the thread size of an AR-15 barrel?

The thread size of an AR-15 barrel is a commonly asked question among gun enthusiasts. A standard AR-15 barrel will usually have a 1/2 x 28 TPI (Threads Per Inch) specification for its threading. This information is necessary if you plan to attach muzzle devices such as flash hiders, compensators or suppressors on your rifle's barrel.

Understanding the thread specifications of your firearm's components can help ensure that you purchase compatible accessories and prevent any damage to your weapon.

When looking for muzzle devices or other parts that will fit onto your AR-15 threaded barrels, it’s essential always to double-check the manufacturer’s specification before making any purchases. Fitting incompatible accessories can result in damage and potentially cause harm.

How do I measure the thread size of my AR-15 Barrel?

Knowing how to properly measure a threaded barreled component like an AR-15' s outer diameter is crucial when it comes to purchasing new equipment for your firearm. Here are some steps you can follow:

Firstly, lay out all necessary tools required such as calipers with metric measurements and tape measures since they enable precise readings.

Secondly, check whether there are existing threads on the end part of your rifle's bore by visually inspecting them before proceeding further.

Thirdly identify which type of threads because not all rifles utilize similar types.

Finally take accurate measurements according to each type in order get exact counts tailored specifically towards individual needs based off preferences like length requirements etcetera – this allows one make sure they're getting exactly what their budget dictates without wasting time searching around online stores where prices may fluctuate often due market demand shifts

Can I change my current Thread Size on my existing Barrel?

It would be best if you did not try changing the threading specs yourself since it requires specialized knowledge and equipment only found within professional gunsmithing services.

Attempting to alter the thread size on your barrel without proper tools and expertise can lead to permanent damage, seriously endangering yourself or others in the process.

Instead of attempting a DIY project that you're not qualified for, it's crucial that you seek professional help from experienced gunsmiths who have the knowledge and correct equipment needed for successful modifications.

What Muzzle Devices fit Best with an AR-15 Barrel Thread Size?

A muzzle device is added at the end of an AR-15 barrel to change its firing characteristics. There are various types of muzzle devices available in today's market – each with its unique features and benefits designed for specific purposes such as flash hiders, compensators or suppressors.

When choosing a muzzle attachment, it's necessary first to determine what specific purpose you want them for:

  • Flash Hider: Designed specifically to minimize visible flash created by burning propellant gases during shooting
  • Compensator: Reduces recoil while also minimizing any upward movement caused by firing.
  • Suppressors: These are used primarily in hunting rifles since they reduce noise levels considerably when fired.

Are there any legal restrictions I should know about regarding AR-15 barrels?

Yes. The National Firearms Act (NFA) restricts ownership or transferal of certain firearm parts like short-barrelled rifles (SBR), which includes changing out your current rifle barrel with one that is shorter than 16 inches without acquiring special permission through ATF Form 4 application process beforehand. It’s important always double check local laws/regulations as well because they may differ depending upon where one resides within US states jurisdictions

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