The Buffer - Theory and when to Use What Buffer

Published on June 7, 2018
Duration: 35:11

This guide, drawing on the expertise of a former Colt employee and AR-15 SME Hank Tatro, details the critical role of AR-15/M16 buffers. It explains how buffer design evolved to manage bolt carrier bounce caused by increased firing rates and different ammunition types. The guide emphasizes selecting the correct buffer for specific firearm configurations and warns against improper mixing and matching, particularly for duty applications. It covers standard rifle and carbine buffers, as well as H, H2, H3, and specialized 9mm buffers, providing insights into their construction and application.

Quick Summary

AR-15/M16 buffers are critical for reliable firearm operation, absorbing recoil and managing bolt carrier speed. Different types like H, H2, and H3 buffers use tungsten weights to slow cycling, preventing bolt carrier bounce, especially in carbine systems with higher rates of fire or specific ammunition. Using the correct buffer for your firearm configuration is essential for preventing malfunctions.

Chapters

  1. 00:00Introduction to AR Buffers
  2. 02:18Rifle Buffers and Bolt Carrier Bounce
  3. 04:55Colt Cost-Cutting and Hydraulic Buffers
  4. 11:21Carbine Buffer Evolution
  5. 13:52H2 and H3 Buffers
  6. 18:529mm and Specialized Buffers
  7. 23:37Identification and Final Recommendations

Frequently Asked Questions

What is the primary function of an AR-15 buffer?

The primary function of an AR-15 buffer is to absorb recoil energy and manage the speed of the bolt carrier group's rearward travel. This prevents bolt carrier bounce and ensures reliable cycling of the firearm across different conditions and ammunition types.

Why are there different types of AR-15 buffers like H, H2, and H3?

H, H2, and H3 buffers are progressively heavier than standard carbine buffers, utilizing tungsten weights. They are designed to slow down the bolt carrier group's cycling speed, which is crucial for carbine-length systems, especially those with higher rates of fire or heavier ammunition like M855.

Can I use any AR-15 buffer in my rifle?

No, it's not recommended to mix and match buffers without understanding the implications. Different firearm configurations, barrel lengths, and gas systems require specific buffer weights and types to ensure proper function and reliability. Using the wrong buffer can lead to malfunctions like short-stroking or bolt carrier bounce.

What is bolt carrier bounce and how does the buffer help?

Bolt carrier bounce occurs when the bolt carrier group rebounds off the rear of the receiver extension after completing its rearward travel. Buffers, especially heavier ones, absorb this impact and slow the carrier's momentum, preventing bounce and ensuring the bolt remains forward long enough for reliable feeding and lock-up.

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