My AR-10 Wouldn't Run

Published on January 31, 2026
Duration: 1:30

This video details troubleshooting reliability issues with a CMMG MK3 AR-10, particularly in cold weather and with a suppressor. The host, demonstrating high-level expertise, installs and tests the RifleSpeed Gas Control adjustable gas block. The guide focuses on the process of tuning the gas block for consistent cycling across various conditions, highlighting the sensitivity of AR-10 platforms to ammunition and environmental factors.

Quick Summary

The RifleSpeed Gas Control is a toolless adjustable gas block designed to enhance AR-10 reliability. It uses a dial and plunger to regulate gas flow, compensating for issues like short dwell time, suppressor use, and extreme temperatures, ensuring consistent cycling.

Chapters

  1. 00:00Intro: CMMG MK3 AR-10 Issues
  2. 00:28AR-10 Reliability Troubleshooting
  3. 00:44RifleSpeed Gas Control Installation
  4. 01:13Cold Weather Testing & Conclusion

Frequently Asked Questions

What causes reliability issues in AR-10 rifles like the CMMG MK3?

AR-10s, especially those with short barrels and mid-length gas systems like the CMMG MK3, can suffer from short dwell time. This makes them highly sensitive to ammunition types, suppressors, and extreme temperatures, often requiring careful gas system tuning.

How does the RifleSpeed Gas Control help AR-10 reliability?

The RifleSpeed Gas Control is a toolless adjustable gas block. It allows precise regulation of gas entering the system via a dial, compensating for variations caused by suppressors, ammunition, or temperature changes, ensuring consistent cycling.

What is the recommended method for tuning an adjustable gas block like RifleSpeed?

Start with the gas block fully open (maximum gas). Fire the rifle and, if it fails to cycle, incrementally close the gas block one setting at a time. Test fire after each adjustment until reliable cycling is achieved, especially with a suppressor attached.

Can adjustable gas blocks improve performance in cold weather?

Yes, adjustable gas blocks like the RifleSpeed can significantly improve cold weather performance. By precisely controlling gas flow, they help ensure the firearm cycles reliably even when lubricants thicken or components contract in freezing temperatures.

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