Understanding the AR-15 Threaded Barrel Size: A Comprehensive Guide

When it comes to the AR-15 rifle, the threaded barrel is a crucial component that often goes unnoticed but plays a significant role in the firearm’s performance and customization options. In this detailed guide, we will delve into the intricacies of the AR-15 threaded barrel size, exploring its purpose, benefits, and how it affects the overall shooting experience.

What is a Threaded Barrel?

A threaded barrel, as the name suggests, features threads along its exterior. These threads are designed to accept various accessories, such as flash suppressors, muzzle brakes, and sound suppressors. Unlike a standard barrel, which is smooth, the threaded barrel provides a secure and precise attachment point for these accessories.

Why Choose a Threaded Barrel?

There are several reasons why you might opt for a threaded barrel on your AR-15:

• Customization: The ability to attach various accessories enhances the rifle’s versatility and allows you to tailor it to your specific needs.

• Performance: Some accessories, like muzzle brakes, can improve the rifle’s accuracy and reduce recoil.

• Legal Requirements: In certain jurisdictions, the use of accessories like flash suppressors or sound suppressors is regulated. A threaded barrel allows you to comply with these regulations without compromising the rifle’s performance.

AR-15 Threaded Barrel Sizes

AR-15 threaded barrels come in various sizes, each with its own unique benefits and applications. Here’s a breakdown of the most common sizes:

As you can see, the most common threaded barrel sizes for the AR-15 are 1/2×28, 5/8×24, 9/16×24, and 11/16×24. The thread pitch, measured in threads per inch, determines the number of threads that are cut into the barrel. A higher thread pitch means more threads per inch, which can provide a more secure attachment for accessories.

Choosing the Right Threaded Barrel Size

Selecting the appropriate threaded barrel size for your AR-15 depends on several factors:

• Accessory Compatibility: Ensure that the threaded barrel size you choose is compatible with the accessories you plan to use.

• Caliber: Different calibers may require different threaded barrel sizes. For example, a .223/5.56 caliber rifle typically uses a 1/2×28 threaded barrel, while a .308 caliber rifle may require a larger size.

• Weight and Balance: Consider the weight and balance of the rifle when choosing a threaded barrel size. A heavier barrel may affect the rifle’s handling and accuracy.

Installation and Maintenance

Installing a threaded barrel on your AR-15 is a relatively straightforward process, but it’s essential to follow the manufacturer’s instructions carefully. Here are some key points to keep in mind:

• Use the correct torque specifications when attaching accessories to the threaded barrel.

• Regularly inspect the barrel and accessories for signs of wear or damage.

• Keep the barrel clean and well-lubricated to ensure optimal performance.