Building an Aero Precision M5E1 AR 10 Upper

Editor’s Note:  Building out an Aero Precision M5E1 AR 10 upper is part 3 of a DIY AR 10 build series. We began by finishing two 80% lowers—a polymer receiver from James Madison Tactical and, a conventional aluminum unit from 5D Tactical. Both lowers were then assembled with lower parts kits, drop in triggers, buffer tubes, […]

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