Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 20in 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black Anodized
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Aero Precision
Overview
The Aero Precision M4E1 Threaded Complete Upper Receiver is designed for builders seeking a reliable and precise upper for their AR-15 platform. With a 20-inch barrel and a 1:7 twist rate, this assembly is optimized for stabilizing a wide range of 5.56 NATO ammunition, ensuring consistent accuracy at longer distances. The M4E1 receiver also integrates seamlessly with various handguards, making it a versatile choice for both tactical and precision builds that benefit from the extended barrel length.
Specifications
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 20in 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black Anodized
Build history on GunPartPicker
Builders on GunPartPicker first added the Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 20in 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black Anodized to a build in June 2026.
Today none of the 2 retailers we track has it in stock right now. Listed prices start at $609.99 at Optics Planet for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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