Aero Precision M5E1 - First Shots (AR-10)

Published on April 29, 2018
Duration: 54:32

This video details the first range test of an Aero Precision M5E1 AR-10 build chambered in .308 Win. Initial testing revealed cycling issues and 'doubling' due to a light trigger, prompting a swap to a heavier CMC model. Accuracy was generally poor, with 2-2.5 inch groups at 100 yards, though a 175gr Sierra MatchKing load achieved a 1-inch group. The rifle is over-gassed when suppressed, indicated by brass damage.

Quick Summary

The Aero Precision M5E1 AR-10 experienced cycling issues and bump firing due to a light trigger, and was over-gassed when suppressed, causing brass damage. Accuracy was mostly 2-2.5 MOA, with a 175gr SMK load achieving 1 MOA.

Chapters

  1. 00:00Introduction & Build Overview
  2. 00:41Rifle Weight & Configuration
  3. 01:20Torque Wrench Correction
  4. 07:12Headspace Testing Method
  5. 10:31Reloading Components & Loads
  6. 18:04Initial Range Test & Issues
  7. 25:20Trigger Swap & Brass Damage
  8. 30:30Accuracy Results & Conclusion

Frequently Asked Questions

What were the main issues encountered during the Aero Precision M5E1 AR-10 first shots?

The primary issues were cycling problems and unintentional 'doubling' or bump firing, attributed to a very light 2lb/2lb CMC trigger. Significant brass damage also indicated the rifle was over-gassed, especially when suppressed.

How did the Aero Precision M5E1 AR-10 perform in terms of accuracy?

Accuracy was generally disappointing, with most tested loads yielding groups of 2 to 2.5 inches at 100 yards. However, the 175gr Sierra MatchKing load was an exception, producing a respectable 1-inch group.

What adjustments were made to the Aero Precision M5E1 build after initial testing?

The trigger was swapped from a 2lb/2lb CMC model to a 2lb/4lb CMC model to mitigate bump firing issues. The speaker also noted the rifle was likely over-gassed, suggesting potential adjustments to the gas system.

How was the headspace tested on the Aero Precision M5E1 without gauges?

Lacking headspace gauges, the speaker used fired brass from a known tight-chambered Tikka and a loose-chambered Savage. The M5E1's chamber was assessed to fall between these two, deemed safe for initial testing.

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