My First 6mm ARC Build- First Shots

Published on April 4, 2026
Duration: 9:41

This video details the first shots of a custom 6mm ARC AR-15 build. The presenter highlights specific components like a Rainier Arms barrel, BCM thermal fit, Griffin Armament lower, and Adabal 110 optic. Initial testing reveals cycling issues, particularly with ASC magazines, leading to troubleshooting and a comparison of Faxon and Centurion bolt carrier groups. Velocity data and accuracy observations are provided, with a focus on identifying and resolving build-specific problems.

Quick Summary

The 6mm ARC build achieved an average velocity of 2490.9 fps with Hornady 105gr Black ammo from a 13.9-inch barrel and K-can suppressor. Initial testing revealed cycling issues with ASC magazines, prompting troubleshooting and a comparison between Centurion and Faxon bolt carrier groups.

Chapters

  1. 00:00Introduction to 6mm ARC Build
  2. 00:08Barrel and Upper Receiver Details
  3. 00:13Lower Receiver and Buffer Tube
  4. 00:51CMMG K-can and Optic Setup
  5. 01:27Bolt Carrier Group and Bolt
  6. 01:55Ammunition and Magazine Testing
  7. 03:05First Shots and Cycling Issues
  8. 03:29Velocity Readings
  9. 03:42Troubleshooting Gas System
  10. 04:18Successful Cycling and Firing
  11. 05:08Round Count and Reliability Assessment
  12. 05:33Accuracy and Optic Fine-Tuning
  13. 05:45Average Velocity and Barrel Length Impact
  14. 06:13Excitement for 6mm ARC Future
  15. 06:36Bolt Carrier Group Issues and Modern Armory
  16. 06:51Future Barrel Accuracy Testing
  17. 07:30Faxon vs. Centurion Bolt Comparison

Frequently Asked Questions

What are the key components of this 6mm ARC rifle build?

The build features a 13.9-inch Rainier Arms ultra match barrel, BCM thermal fit upper, Griffin Armament Mark 2 lower receiver, Radiant Raptor charging handle, CMMG K-can, and an Adabal 110 optic with an Apex Plum reticle.

What were the initial performance issues encountered with the 6mm ARC build?

The primary issue was cycling problems, with the rifle failing to lock back or eject rounds reliably, particularly when using ASC magazines. This indicated potential problems with the gas system or bolt carrier group.

What velocity data was obtained for the 6mm ARC build?

With Hornady 105gr Black ammunition from a 13.9-inch barrel and a K-can suppressor, the average velocity was 2490.9 fps, with a maximum recorded velocity of 2542 fps.

How do the Centurion and Faxon bolts compare for 6mm ARC?

The Centurion bolt is noted for its beefy lugs and hard chrome finish, while the Faxon bolt is described as more milspec with a nitride finish. Both have lifetime warranties, but the Centurion is preferred for its robust construction.

Related News

All News →

More Reviews Videos You Might Like

More from Cerebral Firearms

View all →