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

Published on May 29, 2024
Duration: 17:38

This video explores the optimal AR-15 barrel lengths for various roles, featuring insights from Neil McLean. Shorter barrels like 10.5" are ideal for CQB, while 14.5" and 11.5" offer versatility. The 12.5" is highlighted as a performance sweet spot, and 13.7"/13.9" barrels achieve 16" compliance with muzzle devices. Longer 18" and 20" barrels are discussed for distance, though the 5.56 caliber's suitability is questioned for extreme ranges.

Quick Summary

The 12.5-inch AR-15 barrel is highlighted as a performance sweet spot, offering a significant 250 FPS increase over 10.5-inch barrels while remaining compact enough for maneuverability in tight spaces.

Chapters

  1. 00:00Introduction: Choosing AR-15 Barrel Length
  2. 02:21Short Barrels: 10.5" and 5.5" for CQB & Concealment
  3. 04:39Mid-Length Barrels: 14.5" and 11.5" Versatility
  4. 08:36The 12.5" Barrel: A Performance Sweet Spot
  5. 10:01NFA Compliance: 13.7" & 13.9" Barrels
  6. 11:06Long Barrels: 18" & 20" for Distance?
  7. 12:46AR-15 Features: Forward Assist & Dust Covers

Frequently Asked Questions

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

For CQB and indoor operations, shorter barrels like the 10.5-inch MK18 are preferred for their maneuverability. While they sacrifice some muzzle velocity, their compact size is crucial in tight spaces.

What is the advantage of a 12.5-inch AR-15 barrel?

A 12.5-inch barrel is considered a sweet spot, offering a significant velocity increase of about 250 FPS over a 10.5-inch barrel. It maintains good compactness for maneuverability while improving ballistic performance.

How can I achieve a 16-inch barrel length legally with a shorter profile?

You can achieve the legal 16-inch barrel length requirement without a full-length barrel by using shorter barrels like 13.7-inch or 13.9-inch and permanently attaching a muzzle device (pin and weld). This brings the total legal length to 16 inches.

Are 18-inch and 20-inch AR-15 barrels still effective with 5.56 NATO?

While 18-inch and 20-inch barrels maximize powder burn and velocity for 5.56 NATO, their effectiveness at extreme distances is debated. For very long ranges, calibers like .308 Winchester might be more suitable.

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