Aero Precision M4E1 Threaded 11.5" 5.56 Carbine Upper Assembly - 9" M-LOK ATLAS R-ONE
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Aero Precision
Overview
The Aero Precision M4E1 Threaded 11.5" 5.56 Carbine Upper Assembly features a complete upper receiver designed for the AR-15 platform, specifically optimized for 5.56 NATO caliber. With an 11.5-inch barrel, this upper assembly strikes a balance between compactness and ballistic performance, making it suitable for various applications, including close-quarters engagements. You’ll commonly find this upper in builds focused on versatility and maneuverability, especially in tactical or home defense setups.
Specifications
Aero Precision M4E1 Threaded 11.5" 5.56 Carbine Upper Assembly - 9" M-LOK ATLAS R-ONE
Available Merchants(3)
Prices checked
Stock Alert
Build history on GunPartPicker
Builders have been adding the Aero Precision M4E1 Threaded 11.5" 5.56 Carbine Upper Assembly - 9" M-LOK ATLAS R-ONE to their builds on GunPartPicker since February 2026. All time, it ranks #457 of the 1,873 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 5.56 NATO and nearly all AR-15.
It was out of stock everywhere we track for all of September 2026, and today none of the 3 retailers we track has it in stock right now.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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