Which AR-15 Gas Tube Length Is Best For You? | Pistol vs Carbine vs Mid vs Rifle

Published on May 14, 2025
Duration: 13:29

This video breaks down the different AR-15 gas tube lengths (Pistol, Carbine, Mid, Rifle, and Intermediate) and their impact on shooting dynamics. The presenters demonstrate how barrel length and gas system choice affect recoil, muzzle rise, and overall shooting experience, emphasizing that the 'best' system depends on the intended application and build.

Quick Summary

The best AR-15 gas tube length depends on your barrel length and intended use. Shorter barrels necessitate pistol-length systems, while longer barrels benefit from mid, rifle, or intermediate lengths for reduced recoil and a smoother shooting experience. Longer systems move the gas block further away, softening the gas impulse.

Chapters

  1. 00:18Introduction to AR-15 Gas Systems
  2. 00:49Testing Location and Sponsors
  3. 01:07Pistol Length Gas System (7.5" Barrel)
  4. 01:13Carbine Length Gas System (10.5" Barrel)
  5. 01:20Mid Length Gas System (Griffin Upper)
  6. 01:25Rifle Length Gas System (18" Barrel)
  7. 01:32Intermediate Gas System (Mark 12)
  8. 02:17Gas System Selection Factors
  9. 02:37Pistol Length Gas System Constraints
  10. 02:48Mid-Length Gas System on 12" Barrel
  11. 03:38Dwell Time and Recoil Explained
  12. 04:19Live Fire Testing Begins
  13. 04:417.5" Pistol Length Test
  14. 05:4110.5" Carbine Length Test
  15. 06:5412.5" Mid-Length Test
  16. 08:1518" Rifle Length Test
  17. 09:58Intermediate Gas System Test
  18. 10:53Gas System Summary and Tuning
  19. 11:38Favorite Gas System Discussion
  20. 12:44Viewer Engagement and Conclusion

Frequently Asked Questions

What is the primary factor determining AR-15 gas tube length?

The primary factor determining AR-15 gas tube length is the barrel length. Shorter barrels require shorter gas systems like pistol-length, while longer barrels can accommodate mid-length, rifle-length, or intermediate systems for better recoil management and shooting dynamics.

How does gas tube length affect recoil in an AR-15?

Longer gas tubes position the gas block further from the breech, resulting in a less violent gas impulse and consequently lower felt recoil. Shorter systems, like pistol-length on short barrels, have a more direct and forceful gas return, leading to more recoil.

What is dwell time and why is it important for AR-15 gas systems?

Dwell time is the period the gas port remains open after the projectile exits the barrel. It's crucial for cycling the action. Shorter barrels with longer gas systems (like mid-length on a 12-inch barrel) may require larger gas ports to ensure sufficient gas volume for reliable operation.

Which AR-15 gas system is best for a softer shooting experience?

For the softest shooting experience, rifle-length gas systems are generally preferred. They offer the furthest gas block placement, minimizing recoil and muzzle flip. Intermediate and mid-length systems also provide significant improvements over pistol and carbine lengths.

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