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)
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August 2026 on GunPartPicker
Aero Precision M4E1 Threaded AR-15 Barreled Upper 300 Black Atlas R-One - 16" ranked #291 of the 690 upper receivers builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #185 of the 1,574 upper receivers builders have added.
It was out of stock everywhere we track for all of August 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 31 retailers
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