Understanding the A2 Buffer Tube Kit
What is the A2 Buffer Tube Kit?
The AR-15, a modular and versatile platform, has become a cornerstone of the American firearms landscape and is gaining more and more popularity world wide. At the heart of its operation lies a system of carefully engineered components, working in perfect harmony to deliver consistent and reliable performance. Among these critical parts, the buffer tube assembly plays a vital role in managing the rifle’s recoil and ensuring smooth cycling. This article dives deep into one of the most established and reliable choices for AR-15 owners: the A2 Buffer Tube Kit. Designed for the dedicated shooter, builder, and firearms enthusiast, this comprehensive guide will provide you with all the knowledge you need to understand, install, and appreciate the A2 Buffer Tube Kit.
The A2 Buffer Tube Kit represents a standard design that is deeply rooted in the AR-15’s history. The kit comprises a selection of essential components, working together in a cohesive way to manage the operational forces involved when the rifle is fired. It typically includes the buffer tube itself, the buffer spring, the buffer weight, an end plate (receiver plate), and a castle nut.
This system owes its origin to the evolution of the AR-15 platform. Its primary purpose is to absorb the energy generated during the firing cycle, specifically the rearward movement of the bolt carrier group (BCG). This prevents damage to the rifle’s internal components and contributes significantly to a smoother shooting experience. The spring inside the tube compresses, and the buffer weight provides a counter balance. On the return stroke the spring expands, pushing the BCG forward to chamber a new round.
When compared to more modern designs, like those with adjustable length-of-pull or other advanced features, the A2 system has some critical differences. Unlike collapsible systems, the A2’s buffer tube is considerably longer and designed for a specific length of pull. This fixed length is intended for a specific style stock, in the case of the A2, a full-length stock.
The A2 kit’s design offers certain advantages. The A2 system is highly known for its durability and unwavering reliability. The simplicity of its design means fewer moving parts and thus, fewer points of potential failure. This also helps with the cost when compared to more complicated designs. Finally, the A2 system’s consistency is another key feature. It’s designed to work reliably with a wide range of ammunition and operating conditions.
However, it’s essential to acknowledge its limitations. The fixed length of pull can sometimes be a disadvantage, as it may not fit all shooters comfortably. Because of the extended tube, it’s not compatible with shorter-length stocks that are designed to collapse. Adapting the AR-15 to an A2 system may require some modification for some aftermarket stocks as well.
Components of an A2 Buffer Tube Kit (Detailed Breakdown)
The A2 Buffer Tube Kit comprises a number of well-designed, co-dependent parts. Each component plays a crucial role, and understanding their characteristics is essential for both optimal performance and proper maintenance.
The buffer tube, sometimes called a receiver extension, is the backbone of the buffer system. This tube is usually constructed from high-quality aluminum or steel, offering strength and durability. Different grades and finishes are available, but the fundamental design remains consistent. The tube’s threads are designed to attach to the receiver, ensuring a secure and stable fit. Within the tube, you’ll find features like a guide for the buffer spring, which helps maintain its alignment and function. The tube’s robust design ensures a long lifespan and reliable performance, handling the constant impacts that come with each shot.
The buffer spring is another crucial component. You’ll encounter various types of buffer springs, including standard, enhanced, and those constructed from different materials such as music wire or chrome silicon. The spring rate is a vital factor, as it affects how quickly the bolt carrier group cycles. The spring compresses when the BCG moves to the rear and then expands, pushing the BCG forward. The proper spring rate contributes greatly to the reliability and efficiency of the rifle. Choosing a high-quality spring enhances reliability and helps prevent issues like short stroking or failures to extract or eject spent casings.
The buffer weight works in concert with the buffer spring to regulate the speed and momentum of the bolt carrier group. The standard weight will usually perform fine, but you can get heavier buffers, or specialized buffers that accommodate heavier or lighter bullets, gas port size and ammunition choices. The weight serves to help tune the rifle’s gas system for optimal cycling. Heavier buffers are often used with rifles operating with suppressors to slow down the cycle rate and reduce wear on the rifle. The chosen buffer weight has a direct impact on how the rifle performs with different loads and under varied operating conditions.
The end plate (receiver plate) is the part that sits between the buffer tube and the receiver. It serves the purpose of securing the buffer tube, and preventing it from rotating under the forces of the operating BCG. End plates come in various designs, some with sling attachment points. The end plate can be plain or have different sling attachment points depending on the type. Choosing an appropriate end plate is crucial for a secure and stable assembly.
The castle nut is one of the most important pieces of hardware in the assembly. It secures the buffer tube to the receiver. Proper installation and staking are critical for a tight and secure fit. The castle nut must be tightened to the proper torque specification. Staking the castle nut, which involves deforming the metal of the tube into a groove, helps prevent the nut from loosening under recoil and also ensures the buffer tube maintains alignment, which reduces the likelihood of malfunctions.
Installation and Assembly
While the A2 Buffer Tube Kit is fairly simple to assemble, paying attention to each step is critical for the rifle’s overall reliability and safety.
Before beginning any work on your AR-15, it is crucial to assemble the right tools. Common required tools include an AR-15 armorers wrench, which includes the necessary tools to work on different components, a torque wrench, for proper torque specification, and possibly some punches for certain operations. Always wear eye protection.
The first step is to disassemble your lower receiver. With the upper receiver removed, you can proceed to install the end plate onto the receiver. The end plate is slid over the buffer tube and receiver. Assemble the spring and buffer weight inside the buffer tube. The buffer tube then threads onto the receiver. Tighten the castle nut using the appropriate tools and according to the manufacturer’s specifications. Proper torque is essential to keep the assembly secure. The final step involves staking the castle nut. This process uses punches to deform the metal of the end plate into the nut, preventing loosening.
Always check your work after assembly, and make sure all parts are properly aligned and moving freely. If you encounter problems during the process, check your manuals or seek out guidance from experienced AR-15 builders.
Performance and Considerations
The A2 Buffer Tube Kit offers a very well-designed system with a straightforward approach to recoil management and reliable operation, but there are some things to keep in mind for best results.
The A2 system is designed to be used with rifle-length stocks or compatible A2 stocks. The design provides a traditional and steady cheek weld, leading to more consistent and more precise shooting for many users. It’s important to consider whether the fixed length of pull suits your body type.
One of the key advantages of the A2 system is its ability to manage recoil. This contributes to greater control and faster follow-up shots, which can improve accuracy.
Durability is another aspect of the A2 Buffer Tube Kit. With regular maintenance and care, this system will last for many rounds. Periodic cleaning and lubrication are essential for smooth operation and preventing malfunctions.
The A2 system generally does not require a lot of tuning but occasionally you might need to experiment with different buffer weights, if you change ammunition types or add a suppressor to your AR-15.
To maintain the A2 Buffer Tube Kit, keeping it clean and properly lubricated is paramount. Remove carbon buildup from the buffer tube and spring. Always use a lubricant designed for firearms, and apply it sparingly. Proper maintenance keeps your rifle operating smoothly and extends the life of the components.
Comparison with Other Buffer Tube Systems
Compared to the carbine buffer tube kits, the A2 design offers a different approach. Carbine buffer tubes are shorter and designed to accommodate adjustable or collapsible stocks. Carbine systems often allow for a more customized fit. However, the A2 system is often seen as more durable and simple in design.
Adjustable buffer tube kits come with some different options, such as a longer tube, and a series of holes allowing for adjustment and various buffer weights to change the characteristics of the cycle rate and felt recoil. A2 offers a set length of pull, which is a tradeoff for the added simplicity and robustness that the A2 offers.
Where to Buy an A2 Buffer Tube Kit
Several online retailers specialize in providing high-quality AR-15 components. When choosing a vendor, check for companies with solid reputations. Research different brands and models and read reviews to make sure you are getting quality parts. Price shouldn’t be the only factor. Look for components made from quality materials, with durable finishes, and backed by a strong reputation.
Avoid low-quality products and counterfeits. These components can fail and create safety issues. Doing your research and purchasing from trustworthy manufacturers will help you avoid issues.
Conclusion
The A2 Buffer Tube Kit is a reliable choice for AR-15 builders. Its simplicity, durability, and consistency make it a solid system. Choosing the right components, and proper installation are key to a safe, efficient, and satisfying AR-15 platform.
For those considering building or upgrading their rifle, understanding the A2 system is fundamental. Choosing the right kit and following the installation steps are the first steps to success.
For further reading on AR-15 building, you can always consult forums, and online tutorials. You should always familiarize yourself with all local and federal laws when dealing with firearms.
