M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One - M4E1-T 6.5 Grendel Assem Upper DMR 20''''BBL Rifle Threaded FDE
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Aero Precision
Overview
The Aero Precision M4E1 Threaded 6.5 Grendel Assembled Upper Receiver is a complete upper designed for the AR-15 platform, featuring a 20-inch barrel optimized for the 6.5 Grendel caliber. The rifle-length gas system provides smooth cycling and enhanced reliability, making it ideal for precision shooting. This upper receiver, finished in FDE, is commonly found in builds focused on long-range accuracy and performance with the 6.5 Grendel round.
Specifications
M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One - M4E1-T 6.5 Grendel Assem Upper DMR 20''''BBL Rifle Threaded FDE
September 2026 on GunPartPicker
Aero Precision M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One - M4E1-T 6.5 Grendel Assem Upper DMR 20''''BBL Rifle Threaded FDE ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 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 2 retailers we track has it in stock right now. Listed prices start at $614.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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