Prototype 18'' 1 in 6 Twist Green Mountain AR-15 416R Stainless Barrel Test (HD)

Published on May 2, 2015
Duration: 8:55

This video provides an in-depth test of a prototype 18-inch, 1 in 6 twist AR-15 barrel made from 416R stainless steel by Green Mountain Barrels. The instructor, with clear expertise in firearms testing, evaluates the barrel's performance with various ammunition types, including lighter 55-grain bullets and heavier match loads, at 100 yards. The testing aims to determine if the faster twist rate causes issues with lighter bullets and assesses overall accuracy potential.

Quick Summary

An 18-inch, 1 in 6 twist AR-15 barrel made from 416R stainless steel was tested and found to perform well with various ammunition types. Contrary to some expectations, lighter 55-grain bullets did not cause jacket issues, and heavier match loads achieved sub-half-inch groups at 100 yards.

Chapters

  1. 00:21Introduction to R&D Testing
  2. 00:37Green Mountain Barrel Prototype
  3. 01:20Barrel Specifications: Stainless Steel, 1:6 Twist
  4. 01:37Barrel Length and Twist Rate Considerations
  5. 01:59Test Setup: Vortex Scope and Ammunition
  6. 02:14Ammunition Selection for Testing
  7. 02:47Testing Freedom Munitions 55 Grain
  8. 03:42Testing Wolf Steel Case 55 Grain
  9. 04:23Testing Federal 69 Grain Match
  10. 04:52Rifle Build Components
  11. 05:26Testing Hornady TAP 75 Grain
  12. 06:05Target Analysis and Group Sizes
  13. 06:10Freedom Munitions Group Results
  14. 06:22Wolf Ammunition Group Results
  15. 06:37Federal 69 Grain Group Results
  16. 07:01Hornady TAP Group Results
  17. 07:09Conclusion: 1:6 Twist Performance
  18. 07:26Jacket Integrity and Accuracy Summary
  19. 07:45Final Thoughts and Thanks

Frequently Asked Questions

Does a 1 in 6 twist rate AR-15 barrel cause issues with lighter bullets?

During testing of an 18-inch, 1 in 6 twist AR-15 barrel, there was no evidence of jacket separation or tearing with 55-grain bullets. The barrel performed adequately with lighter grains, though heavier match loads yielded superior accuracy.

What kind of accuracy can be expected from an 18-inch, 1 in 6 twist AR-15 barrel?

Accuracy varies by ammunition. With Federal 69-grain match ammo, groups under half an inch were achieved at 100 yards. Lighter 55-grain loads grouped around 1.5 inches, and steel-cased ammo grouped around 3.25 inches.

What are the specifications of the prototype Green Mountain AR-15 barrel tested?

The prototype barrel is 18 inches long, features a 1 in 6 twist rate, is constructed from 416R stainless steel, has a bull profile, and includes a target crown and M4 feed ramps.

What ammunition was used to test the 1 in 6 twist AR-15 barrel?

The test included Freedom Munitions 55-grain remanufactured, Federal 69-grain match, Wolf 55-grain steel case, and Hornady TAP 75-grain ammunition to evaluate performance across different bullet weights and types.

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