Your AR 15 is Not Free Floated

Published on January 24, 2021
Duration: 10:07

This video demonstrates a practical experiment to illustrate how the AR-15's gas block and gas tube assembly can significantly impact barrel harmonics and overall accuracy. The host, with expert-level knowledge, conducts a test using .300 Blackout subsonic ammunition, comparing accuracy groups with the gas system installed, removed, and reinstalled. The results show distinct variations in grouping, highlighting that the barrel is not truly 'free-floated' due to these components.

Quick Summary

An AR-15 barrel is not truly free-floated due to the gas block and gas tube assembly making contact with the barrel. These components are essential for the direct impingement system and prevent complete isolation, impacting barrel harmonics and accuracy. A free-floated handguard attaches only at the receiver to minimize external influence on the barrel.

Chapters

  1. 00:00AR-15 Free Float Misconception
  2. 00:49Free-Floating Handguard Benefits
  3. 01:26Free-Floating Rail Drawbacks
  4. 02:10Barrel Not Truly Free Floated
  5. 02:35Experiment Setup: Gas System Impact
  6. 02:59Sponsor Message: DLD VIP
  7. 05:29Range Test: .300 Blackout Subsonics
  8. 06:23Gas Block Removed Test
  9. 07:00Gas Block Reinstalled Test
  10. 07:32Test Results and Implications
  11. 08:12Scientific Caveats and Future Test Idea

Frequently Asked Questions

Why isn't an AR-15 barrel truly free-floated, even with a free-floated handguard?

An AR-15 barrel is not truly free-floated because the gas block and gas tube assembly make direct contact with the barrel. These components are integral to the direct impingement system and prevent the barrel from being completely isolated from its own operating parts.

How does the gas block and tube affect AR-15 accuracy?

The gas block and tube assembly can significantly impact barrel harmonics due to their contact points and alignment with the barrel. Even minor variations in installation or the presence of these components can alter how the barrel vibrates, leading to changes in bullet impact and accuracy.

What is the benefit of a free-floated handguard on an AR-15?

A free-floated handguard attaches only to the receiver, preventing accessories or external pressure from contacting the barrel. This isolation helps maintain consistent barrel harmonics, which is crucial for maximizing accuracy by ensuring the barrel vibrates predictably.

Can a free-floated handguard cause accuracy issues on an AR-15?

Yes, if a free-floated handguard is not properly engineered with features like anti-rotation tabs, excessive pressure applied to the front of the handguard can still cause it to flex or shift, potentially impacting the barrel's alignment and accuracy.

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