WWSD2020: Barrel Selection & Heat Zero Testing

Published on January 17, 2020
Duration: 11:27

This guide details a heat stress and zero shift test for AR-15 barrels, as demonstrated by Karl Kasarda and Ian McCullum on InRangeTV. The procedure involves firing cold and hot groups with specific barrels to assess accuracy under thermal load. The experts conclude that modern pencil barrels, when properly manufactured with stress relief, maintain zero even when heated, with weight being the primary differentiator for lightweight builds like the WWSD2020.

Quick Summary

Modern pencil barrels, like those from Ballistic Advantage and Faxon tested for the WWSD2020 project, maintain their zero even when subjected to significant heat from rapid firing. While group sizes may expand, the point of impact remains consistent, indicating proper stress relief in manufacturing. The primary difference noted was weight, with the Faxon barrel being lighter and preferred for lightweight builds.

Chapters

  1. 00:00Introduction to WWSD2020 Project
  2. 00:26Barrel Options and Issues
  3. 01:15Flash Hider Durability
  4. 01:42Heat Stress Testing Objective
  5. 01:55Historical Pencil Barrel Issues
  6. 02:20Modern Pencil Barrel Improvements
  7. 03:03Current Barrel Test Goals
  8. 03:09Test Setup Details
  9. 04:21Ammunition Used
  10. 04:38Test Procedure
  11. 05:14Ballistic Advantage Cold Group
  12. 05:26Ballistic Advantage Cold Group Review
  13. 05:49Ballistic Advantage Heat-up and Hot Group
  14. 06:32Ballistic Advantage Hot Group Review
  15. 07:21Faxon Cold Group
  16. 07:40Faxon Cold Group Review
  17. 08:02Faxon Heat-up and Hot Group
  18. 08:51Faxon Hot Group Review
  19. 09:34Conclusion and Barrel Choice
  20. 10:13Weight Difference Discussion
  21. 10:47Recommendation & Project Decision

Frequently Asked Questions

What is the purpose of the heat stress test for AR-15 barrels?

The heat stress test evaluates how a barrel's accuracy and point of impact change when it becomes hot from rapid firing. The goal is to ensure the barrel maintains its zero, meaning shots land consistently despite temperature fluctuations, which is crucial for reliable performance.

Which barrel is recommended for the WWSD2020 project and why?

For the WWSD2020 project, the Faxon 16" Pencil Threaded Barrel is chosen due to its lighter weight (20.05 oz) compared to the Ballistic Advantage 16" Pencil Barrel (24.5 oz). Both barrels performed excellently in heat stress tests, but the Faxon's lighter profile better suits the project's focus on a lightweight rifle build.

Do modern pencil barrels shift zero when heated?

According to expert testing on the WWSD2020 project, modern pencil barrels, when manufactured with proper stress relief techniques, do not exhibit significant zero shift when heated. While the group size may increase, the point of impact remains consistent, unlike older designs.

What ammunition was used for the barrel testing?

The testing utilized standard American Eagle M855 62-grain ammunition. This choice reflects common ammunition types used by the general shooting population, providing a more realistic performance assessment than specialized match-grade rounds.

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