Ep-9: Choosing the Right AR-15 Buffer Weights, Springs & Buffer Tubes... Starts Here!

Published on October 28, 2022
Duration: 13:18

This guide details how to select and install the correct buffer, spring, and buffer tube for an AR-15. It emphasizes matching components to barrel length and gas system for optimal cycling. The video features Randy from AT3 Tactical, a subject matter expert, explaining the mechanics and tuning process.

Quick Summary

Choosing the right AR-15 buffer assembly components is crucial for reliable cycling. The buffer tube comes in Rifle and Carbine lengths, with Mil-spec (1.148") and Commercial (1.168") diameters. Carbine buffers have weights ranging from 3oz (Standard) to 5.4oz (H3). An H2 buffer is a good starting point for 5.56/.223 builds, balanced with an appropriate carbine spring.

Chapters

  1. 00:00Introduction to Buffer Assemblies
  2. 01:50Cycling Mechanics Explained
  3. 03:59Buffer Tube Variations (Length & Diameter)
  4. 06:14Buffer Weights and Tuning Options
  5. 09:15Buffer Springs Explained
  6. 11:13Choosing the Right Combination

Frequently Asked Questions

What are the main components of an AR-15 buffer assembly?

The AR-15 buffer assembly includes the buffer, buffer spring, and buffer tube (receiver extension). Its primary functions are to absorb the rearward force of the bolt carrier group and ensure it returns forward to chamber a new round.

How do buffer weights affect AR-15 cycling?

Buffer weights (Standard, H1, H2, H3) control the speed of the bolt carrier group (BCG). Heavier buffers slow the BCG, which is beneficial for shorter barrels or suppressed use to prevent over-gassing. Lighter buffers speed it up, useful for longer barrels or under-gassed systems.

What is the difference between Mil-spec and Commercial buffer tubes?

Mil-spec buffer tubes have a diameter of 1.148 inches, while Commercial tubes are slightly larger at 1.168 inches. Mil-spec is the industry standard, offering a tighter fit for Mil-spec stocks. Commercial stocks may fit Mil-spec tubes but can have some wobble.

Which buffer weight is best for a standard AR-15 build?

For a typical 5.56 NATO/.223 Remington build with a 16-inch barrel and mid-length gas system, an H2 buffer is often recommended as a versatile starting point. Tuning may still be required based on specific components and ammunition.

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