Choosing the right buffer tube for your AR-15 build is crucial for proper functionality and reliability. Understanding the dimensions of an A2 buffer tube is the first step in ensuring a successful build. This guide dives deep into the specifics, exploring the nuances of length, diameter, and critical compatibility factors.
Understanding the AR-15 Buffer Tube System
Before we delve into the A2 buffer tube's dimensions, let's briefly understand its role within the AR-15 system. The buffer tube is a critical component of the firearm's recoil system. It houses the buffer spring and buffer, which work together to absorb recoil energy and allow the bolt carrier group to cycle smoothly. The correct buffer tube length is essential for proper function and preventing malfunctions. An incorrectly sized buffer tube can lead to issues like:
- Short stroking: The bolt carrier group fails to fully cycle, leading to jams and failures to fire.
- Over travel: The bolt carrier group travels too far to the rear, potentially damaging the receiver extension.
- Inconsistent recoil: The firearm's recoil impulse isn't properly managed, impacting accuracy and shooter comfort.
A2 Buffer Tube Dimensions: The Specifics
The A2 buffer tube is a classic design, known for its reliability and widespread use. While variations exist, the core dimensions remain consistent:
Length:
The overall length of an A2 buffer tube is typically 6.85 inches. However, this measurement can fluctuate slightly depending on the manufacturer and specific tolerances. It's crucial to measure your specific tube if precise measurements are needed for a custom build or modification.
Diameter:
The outer diameter of an A2 buffer tube is generally 1.160 inches. Again, slight variations might occur, so precise measurement is recommended for critical applications.
Internal Dimensions:
The inner diameter of the tube isn't as standardized as the outer diameter. Variations arise due to manufacturing tolerances and the internal threading used to secure the buffer retainer. While a precise measurement is less commonly needed, being aware of potential variations is essential when selecting components that fit inside the tube.
Threading:
The A2 buffer tube features a standard 1.00 inch-14 thread pitch at its receiver end. This allows for secure attachment to the lower receiver extension. This thread pitch is critical for compatibility; using a tube with incorrect threading will result in an unsafe and unreliable installation.
Compatibility Considerations:
Choosing the correct buffer tube is vital. The length of the buffer tube directly impacts the length of the buffer spring needed to maintain proper function. Using an incorrect length spring can significantly impair the rifle's ability to cycle reliably. Always check the manufacturer's specifications for recommended buffer spring length when pairing it with a buffer tube.
Beyond Dimensions: Quality and Material
While dimensions are crucial, consider the material and manufacturing quality of the buffer tube. A high-quality buffer tube, usually constructed from robust materials like 7075-T6 aluminum, will provide superior durability and longevity. Choosing a reputable manufacturer is key to ensuring the tube meets the necessary strength and dimensional requirements.
Conclusion:
Understanding the dimensions of an A2 buffer tube is fundamental to building or modifying an AR-15. Precise measurements might be necessary depending on the specific application. Always prioritize quality materials and reputable manufacturers to ensure a functional and reliable firearm. Consult the manufacturer's specifications and guidelines for the most accurate information on your specific buffer tube.
