The Buffer - Theory and when to Use What Buffer

Published on June 7, 2018
Duration: 35:11

This video delves into the critical role of AR-15 buffers, explaining their function in managing bolt carrier bounce and ensuring reliability across various conditions. It details the evolution from early rifle buffers to specialized H, H2, and H3 carbine buffers, highlighting the use of tungsten for increased mass. The content also covers unique applications like 9mm blowback systems and provides practical advice on buffer selection for different firearm configurations.

Quick Summary

AR-15 buffers absorb excess energy from the bolt carrier group's rearward travel, preventing bolt carrier bounce and ensuring reliable cycling and locking. Heavier buffers like H, H2, and H3 use tungsten to manage recoil and timing, especially in carbine systems.

Chapters

  1. 00:00Introduction to AR Buffers
  2. 02:18Rifle Buffers & Bolt Carrier Bounce
  3. 04:55Colt Cost-Cutting & Hydraulic Buffers
  4. 11:21Carbine Buffer Evolution (H Buffer)
  5. 13:52H2 and H3 Buffer Explained
  6. 18:529mm and Specialized Buffers
  7. 23:37Buffer Identification & 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 excess energy from the bolt carrier group's rearward travel, preventing bolt carrier bounce and ensuring reliable cycling and locking of the bolt. It helps manage the firearm's recoil impulse and timing.

What's the difference between a standard rifle buffer and a carbine buffer?

A standard rifle buffer (approx. 5.1 oz) is longer and designed for rifle-length gas systems. Carbine buffers (starting at 3 oz) are shorter for carbine-length systems. Heavier carbine buffers like H, H2, and H3 use tungsten to add mass and manage recoil and carrier bounce.

Why are heavier buffers like H2 and H3 used in AR-15s?

Heavier buffers (H2 at 4.7 oz, H3 at 5.6 oz) are used to counteract bolt carrier bounce in carbine systems, especially those with shorter barrels, heavier barrels, or higher rates of fire. They add mass to slow the carrier's rearward movement, ensuring proper function.

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

No, buffer selection is critical. Using the wrong buffer can cause malfunctions like short-stroking or bolt bounce. It's best to use the buffer specified for your barrel length, gas system, and intended ammunition type, especially for duty or defense.

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