AR-15 Barrel Selection Guide: What Length Barrel To Get? Pros & Cons Of Length (HD)

Published on January 5, 2015
Duration: 16:20

This guide explores AR-15 barrel lengths, emphasizing how 5.56mm velocity is crucial for bullet performance. Shorter barrels can reduce accuracy potential and increase muzzle blast, while longer barrels offer higher velocity. The video debunks the myth that longer barrels are inherently more accurate, suggesting shorter, stiffer barrels might be better for certain applications. It also covers dwell time's impact on reliability and legal considerations for barrel length.

Quick Summary

The minimum legal barrel length for an AR-15 in the US is 16 inches. Shorter barrels require NFA paperwork. Barrels under 10.5 inches can face reliability issues due to insufficient dwell time, and shorter barrels may offer better mechanical accuracy due to increased stiffness.

Chapters

  1. 00:00Introduction to AR-15 Barrel Lengths
  2. 01:15Reliability and Dwell Time Explained
  3. 04:56Barrel Length vs. Muzzle Velocity & Lethality
  4. 08:34Barrel Length and Accuracy Myths Debunked
  5. 09:54Barrel Length and Twist Rate Relationship
  6. 11:50Pros & Cons: Short Barrels (Blast, Flash, Wear)
  7. 13:01AR-15 Barrel Length Recommendations

Frequently Asked Questions

What is the minimum legal barrel length for an AR-15 in the US?

In the United States, the minimum legal barrel length for an AR-15 rifle is 16 inches. Shorter barrels (under 16 inches) are classified as short-barreled rifles (SBRs) and require specific NFA paperwork and tax stamps.

How does AR-15 barrel length affect reliability?

Barrels significantly shorter than 10.5 inches can sometimes face reliability issues. This is often related to 'dwell time,' the period gas operates the action, which needs to be sufficient for proper cycling.

Are longer AR-15 barrels always more accurate?

No, the idea that longer barrels are inherently more accurate is a myth. Shorter barrels can be stiffer, reducing 'whip,' potentially leading to better mechanical accuracy, especially at closer ranges where velocity is still adequate.

What are the downsides of short AR-15 barrels?

Short barrels typically produce more muzzle blast, flash, and concussion. They also contribute to increased wear on suppressors due to higher pressure and unburnt powder exiting the muzzle.

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