Which AR-15 Barrel Length Is Best? (w/ Neil McLean)

Published on May 29, 2024
Duration: 17:38

Expert Neil McLean, a tactical consultant, breaks down AR-15 barrel lengths based on mission requirements. He highlights 10.5" for CQB, 12.5" as a velocity/compactness sweet spot, and discusses NFA compliance with pinned/welded 13.7"/13.9" barrels. McLean also touches on longer barrels and the utility of features like forward assists.

Quick Summary

For Close Quarters Battle (CQB), 10.5" AR-15 barrels offer superior maneuverability. The 12.5" length is often cited as a 'sweet spot,' balancing velocity and compactness. Barrels around 13.7"-13.9" with pinned muzzle devices meet 16" NFA requirements legally.

Chapters

  1. 00:00Introduction: AR-15 Barrel Length Discussion
  2. 02:21Short Barrels: 10.5" MK18 & 5.5" Rattler
  3. 04:39Mid-Length Barrels: 14.5" & 11.5" Applications
  4. 08:36The 12.5" Barrel Sweet Spot
  5. 10:01NFA Compliance: 13.7" & 13.9" Barrels
  6. 11:06Long Barrels: 18" SPR & 20" Rifles
  7. 12:46Feature Debate: Forward Assist & Dust Covers

Frequently Asked Questions

What is the best AR-15 barrel length for Close Quarters Battle (CQB)?

For CQB and maximum maneuverability in tight spaces like house clearing, shorter barrels around 10.5" are generally preferred. While they reduce muzzle velocity compared to longer options, their compact size is a significant advantage in confined environments.

Is there a 'sweet spot' for AR-15 barrel length?

Many experts consider the 12.5" barrel length a versatile 'sweet spot' for AR-15s. It offers a substantial increase in muzzle velocity over 10.5" barrels (around 250 FPS) while remaining compact enough for good handling characteristics.

How can I achieve a 16-inch barrel length without NFA regulations?

You can achieve a legal 16-inch barrel length on an AR-15 without NFA registration by using barrels around 13.7" or 13.9" and permanently attaching a muzzle device (like a brake or flash hider) via pinning and welding. This effectively extends the barrel's length to 16 inches.

What are the trade-offs between short and long AR-15 barrels?

Short barrels (e.g., 10.5") prioritize maneuverability at the cost of velocity and range. Long barrels (e.g., 20") maximize velocity and potential range for the caliber but sacrifice handling and portability. Mid-lengths (12.5"-14.5") offer compromises.

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