10,000 Rounds - BCM Accuracy Test

Published on June 18, 2025
Duration: 14:16

This video details a 10,000-round durability test on a BCM AR-15 upper receiver, focusing on bore condition and accuracy. The instructor uses a bore scope to examine wear, particularly at the gas port and in the lands and grooves, comparing it to a new barrel. Accuracy testing with match ammunition reveals the rifle's performance after extensive use, demonstrating its continued capability despite visible wear.

Quick Summary

After 10,000 rounds with accelerated wear, a BCM AR-15 barrel still achieved a 3-inch group at 100 yards with 69-grain match ammunition. Visible wear included 'gatoring' of the chrome lining and gas port erosion, but the rifling remained functional, demonstrating the rifle's durability.

Chapters

  1. 00:00Introduction: 10,000 Round BCM Test
  2. 00:57Bore Scope Inspection Setup
  3. 02:2610,000 Round Barrel Bore Scope View
  4. 03:44Gas Port Erosion Analysis
  5. 05:06Barrel Lands and Grooves After 10k Rounds
  6. 05:25Chamber and Lead Area Inspection
  7. 07:06New Barrel Bore Scope Comparison
  8. 08:09New Barrel Gas Port View
  9. 09:42Accuracy Test Setup: 100 Yards
  10. 10:04Firing Federal Gold Medal Match Ammo
  11. 11:18Accuracy Test Results: 3-Inch Group
  12. 11:54Interpreting Accuracy Results
  13. 12:3610,000 Rounds vs. Barrel Life
  14. 13:03Impact of Accelerated Wear
  15. 13:17Viewer Feedback and Conclusion

Frequently Asked Questions

What is the condition of a BCM AR-15 barrel after 10,000 rounds with accelerated wear?

After 10,000 rounds, including rapid firing and extreme heat, the BCM barrel showed visible wear like 'gatoring' in the chrome lining and erosion at the gas port. Despite this, the lands and grooves remained sufficiently defined for accuracy, producing a 3-inch group at 100 yards with match ammunition.

How does gas port erosion affect an AR-15's performance?

Gas port erosion, caused by flame cutting from hot gases, can enlarge the port over time. This leads to increased gas pressure, potentially making the rifle over-gassed. An over-gassed AR-15 may eject brass aggressively forward, typically past the 3 o'clock position.

What is 'gatoring' in a rifle barrel?

'Gatoring' refers to the flaking or peeling of chrome lining from a firearm barrel's bore, often seen after extensive use and exposure to high temperatures. It resembles the patterned skin of an alligator and is most noticeable towards the chamber and lead areas.

Can a rifle barrel still be accurate after 10,000 rounds?

Yes, a rifle barrel can still be accurate after 10,000 rounds, especially if it's a quality barrel like the BCM tested. While wear is evident, the rifling may remain functional. In this test, the 10,000-round barrel achieved a 3-inch group at 100 yards with match ammunition, demonstrating continued capability.

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