Blogs & Articles

Exploring the Anatomy of AR15 Bolt Carrier Group

The AR15 is one of the most popular rifles in the United States, and for good reason. It is highly customizable, reliable, and easy to use. One of the key components of the AR15 is the bolt carrier group (BCG). In this article, we will explore the anatomy of the AR15 BCG and its importance in the functioning of the rifle.

What is a Bolt Carrier Group?

The bolt carrier group is the heart of the AR15. It is responsible for loading, firing, and ejecting rounds from the rifle. The BCG is made up of several parts, including the bolt, bolt carrier, gas key, firing pin, and cam pin. Each of these parts plays a crucial role in the functioning of the rifle. The animation below shows how the AR15 bolt carrier group fits together, demonstrating the assembly and functioning of the various components. Watching such animations can be helpful in understanding the mechanics of the AR15 BCG.

Bolt

The bolt is the part of the BCG that locks into the barrel and contains the firing pin. It is made of high-quality steel and is responsible for chambering and extracting rounds from the rifle. The bolt also has gas rings that help seal the chamber and prevent gas from escaping.

Bolt Carrier

The bolt carrier is the part of the BCG that houses the bolt and moves back and forth during the firing process. It is also made of high-quality steel and is responsible for transferring the energy from the gas system to the bolt. The bolt carrier also has a gas key that connects to the gas tube and allows gas to enter the BCG.

Gas Key

The gas key is a small piece of metal that is attached to the bolt carrier. It is responsible for connecting the gas tube to the BCG and allowing gas to enter the system. The gas key is an essential part of the BCG and must be properly torqued and staked to prevent it from coming loose during firing.

Firing Pin

The firing pin is a small, cylindrical piece of metal that is housed within the bolt. It is responsible for striking the primer of the round and igniting the gunpowder. The firing pin must be properly lubricated to ensure smooth and reliable firing.

Cam Pin

The cam pin is a small, cylindrical piece of metal that connects the bolt to the bolt carrier. It is responsible for rotating the bolt as the bolt carrier moves back and forth during the firing process. The cam pin must be properly lubricated to ensure smooth movement and prevent wear and tear.

Importance of a Quality BCG

The BCG is a crucial component of the AR15, and having a high-quality BCG is essential for the proper functioning of the rifle. A well-made BCG will ensure smooth and reliable firing, as well as increased accuracy. When looking for the best bolt carrier group for your AR15, be sure to consider factors such as material, coating, and staking.

Conclusion

The AR15 bolt carrier group is a complex and essential part of the rifle. Each component plays a crucial role in the functioning of the rifle, and it is important to understand the anatomy of the BCG to properly maintain and upgrade your AR15. By investing in a high-quality BCG and properly maintaining it, you can ensure that your AR15 will continue to perform at its best.

Stay Updated with

Our Newsletter

Recent Posts