Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in Mid Length Pencil Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black
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Aero Precision
Overview
The Aero Precision M4E1 Complete Upper Receiver features a 16-inch 5.56 NATO barrel with a mid-length gas system that helps optimize reliability and recoil management. With a 1:7 twist rate, this upper is designed to stabilize a variety of bullet weights, making it versatile for different shooting applications. Commonly found in builds aimed at precision shooting or general-purpose use, this upper receiver provides a solid foundation for any AR-15 enthusiast.
Specifications
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in Mid Length Pencil Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black
Build history on GunPartPicker
Builders on GunPartPicker first added the Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in Mid Length Pencil Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black to a build in April 2026.
It was out of stock everywhere we track for all of August 2026, and today none of the 3 retailers we track has it in stock right now. Listed prices start at $594.99 at Optics Planet for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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