Aero Precision M4E1 Assembled Gen 2 Upper Receiver 8 Pistol Length
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Aero Precision
Overview
The Aero Precision M4E1 Assembled Gen 2 Upper Receiver is a complete upper designed for AR-15 builds, featuring an 8-inch barrel optimized for the 300 Blackout caliber. With a pistol-length gas system and a 1:7 twist rate, this upper provides reliable cycling and stability, making it suitable for a variety of ammunition types. This upper is commonly used in builds focused on compact configurations and subsonic performance, particularly in 300 Blackout setups.
Specifications
Aero Precision M4E1 Assembled Gen 2 Upper Receiver 8 Pistol Length
Build history on GunPartPicker
Builders have been adding the Aero Precision M4E1 Assembled Gen 2 Upper Receiver 8 Pistol Length to their builds on GunPartPicker since March 2026. All time, it ranks #917 of the 1,654 upper receivers builders have added.
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. Listed prices start at $534.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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