Aero Precision M4E1 Threaded AR-15 Barreled Upper 300 Black Atlas R-One - 16"
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Aero Precision
Overview
The Aero Precision M4E1 Threaded AR-15 Barreled Upper in 300 Blackout features a complete assembly with a 16-inch barrel that has a salt bath nitride coating for enhanced durability. With a pistol-length gas system and a 1:7 twist rate, this upper is designed to stabilize a range of projectile weights, making it versatile for various shooting applications. This upper is commonly found in builds focused on the 300 Blackout caliber, particularly those optimized for shorter, compact configurations.
Specifications
Aero Precision M4E1 Threaded AR-15 Barreled Upper 300 Black Atlas R-One - 16"
Available Merchants(4)
Prices checked
Stock Alert
Build history on GunPartPicker
Builders have been adding the Aero Precision M4E1 Threaded AR-15 Barreled Upper 300 Black Atlas R-One - 16" to their builds on GunPartPicker since February 2026. All time, it ranks #240 of the 1,873 upper receivers builders have added.
It was out of stock everywhere we track for all of September 2026, and today none of the 4 retailers we track has it in stock right now. Listed prices start at $564.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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