Which barrel length is best for an AR-15? We perform the ultimate tests.

Published on July 9, 2023
Duration: 22:42

Garand Thumb, a recognized expert in civilian tactical firearm testing, presents a data-driven analysis of AR-15 barrel lengths. The video details empirical testing using a LabRadar to measure muzzle velocity across six different barrel lengths (10.3" to 16") with 5.56 NATO ammunition. It also covers bullet drop at 300 yards and provides application-specific recommendations for each barrel length, emphasizing the trade-offs between velocity, portability, and ballistic performance.

Quick Summary

Garand Thumb, a leading expert in tactical firearm testing, conducted empirical tests on AR-15 barrel lengths from 10.3" to 16". Using a LabRadar, he measured muzzle velocity and bullet drop at 300 yards, demonstrating how barrel length impacts 5.56 NATO performance. Recommendations are provided for various applications, from CQB to open-field engagements.

Chapters

  1. 00:00Introduction to Barrel Length Testing
  2. 02:32Rifle Lineup and Specs
  3. 03:03Velocity Testing (FPS)
  4. 06:51Data Analysis with Engineer
  5. 08:27300-Yard Drop and Accuracy Test
  6. 13:17Final Recommendations by Length

Frequently Asked Questions

What is the optimal AR-15 barrel length for close-quarters combat (CQB)?

For extreme CQB and situations like ship boarding, a 10.3" barrel is recommended due to its compact size, though it sacrifices significant muzzle velocity. The 11.5" barrel is often considered a better all-around compromise for a short rifle.

How does AR-15 barrel length affect bullet velocity?

Longer barrels generally produce higher muzzle velocities. For example, a 16" barrel can achieve nearly 300 FPS more than a 10.3" barrel with the same ammunition, which is crucial for 5.56 NATO's terminal ballistics.

Does barrel length impact the accuracy of an AR-15?

While velocity differs significantly, the intrinsic mechanical accuracy of an AR-15 can remain comparable across various barrel lengths if the shooter is proficient. Factors like ammunition and barrel quality play a larger role in inherent accuracy than length alone.

What are the recommended AR-15 barrel lengths for different scenarios?

10.3" for extreme CQB, 11.5" as a short compromise, 12.5" for a balanced mid-length, 14.5" as a combat standard, and 16" for maximum ballistic performance in open areas like Idaho.

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