Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Carbine Atlas R-One - 12.5"
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Aero Precision
Overview
The Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Carbine Atlas R-One - 12.5" is a upper receiver. Compare prices from multiple merchants and find the best deal.
Specifications
Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Carbine Atlas R-One - 12.5"
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Build history on GunPartPicker
Builders have been adding the Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Carbine Atlas R-One - 12.5" to their builds on GunPartPicker since February 2026. All time, it ranks #271 of the 1,654 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 5.56 NATO, nearly all on carbine-length gas, and nearly all AR-15.
Updated · from real builds on GunPartPicker
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Frequently Built With
The part most often added in each category by the builds that include this one
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