Aero Precision M5E1 - First Shots (AR-10)

Published on April 29, 2018
Duration: 54:32

This comprehensive guide details the initial range testing and troubleshooting of an Aero Precision M5E1 AR-10 build. Expert insights cover rifle weight, torque physics, headspace testing alternatives, component selection for handloads, and diagnosing cycling issues like doubling and over-gassing. The video highlights the importance of trigger weight and potential limitations of the barrel for achieving optimal accuracy.

Quick Summary

The Aero Precision M5E1 AR-10 build faced cycling issues and 'doubling' due to a light 2lb/2lb CMC trigger. Troubleshooting involved swapping to a 2lb/4lb CMC trigger and inspecting brass for over-gassing. Accuracy was initially poor (2-2.5" groups), with the 175gr SMK achieving 1". Headspace was estimated using fired brass from other rifles.

Chapters

  1. 00:00Introduction and Build Overview
  2. 00:41Rifle Weight and Configuration
  3. 01:20Technical Correction: Torque and Physics
  4. 07:12Headspace Testing Logic
  5. 10:31Reloading Components and Load Data
  6. 18:04Range Testing and Cycling Issues
  7. 25:20Trigger Swap and Resumed Testing
  8. 30:30Accuracy Results and Conclusion

Frequently Asked Questions

What were the key troubleshooting steps for the Aero Precision M5E1 AR-10 build?

The build experienced cycling issues and 'doubling' due to a light trigger. Troubleshooting involved replacing the 2lb/2lb CMC trigger with a 2lb/4lb model and inspecting brass for over-gassing signs like rim bites and ejector swipes, especially when suppressed.

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

Lacking specific headspace gauges, the builder used fired brass from rifles with known tight and loose chambers. The M5E1's chamber was assessed by comparing how the fired brass from those rifles fit into the M5E1's chamber, deeming it safe for initial testing.

What were the accuracy results for the Aero Precision M5E1 build?

Initial accuracy was generally disappointing, with groups around 2-2.5 inches at 100 yards. The 175gr Sierra MatchKing bullet was the best performer, achieving a 1-inch group, suggesting the barrel might be a limiting factor.

What safety concerns arose during the Aero Precision M5E1 testing?

A very light 2lb/2lb CMC 2-stage trigger, combined with the .308 Winchester recoil, led to unintentional 'doubling' or bump firing, posing a safety risk. This necessitated a trigger swap to a heavier model.

Related News

All News →

More Reviews Videos You Might Like

More from Johnny's Reloading Bench

View all →