M4E1 Threaded Complete Upper 6.5 Grendel SS Barrel ATLAS R-ONE 15" M-LOK HG - Andonized
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Aero Precision
Overview
The Aero Precision M4E1 Threaded Complete Upper is designed specifically for the AR-15 platform and features a 15-inch barrel optimized for the 6.5 Grendel caliber. This complete upper receiver assembly combines the M4E1 receiver type with a precision-engineered barrel, enabling enhanced accuracy and performance for your builds. You'll commonly find this upper in precision-oriented configurations where long-range shooting is prioritized.
Specifications
M4E1 Threaded Complete Upper 6.5 Grendel SS Barrel ATLAS R-ONE 15" M-LOK HG - Andonized
Build history on GunPartPicker
Builders have been adding the Aero Precision M4E1 Threaded Complete Upper 6.5 Grendel SS Barrel ATLAS R-ONE 15" M-LOK HG - Andonized to their builds on GunPartPicker since March 2026. All time, it ranks #961 of the 1,711 upper receivers builders have added.
It was out of stock everywhere we track for all of September 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $654.99 at AR15 Discounts for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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