M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One - M4E1-T 6.5 Grendel Assem Upper SPR 18"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 assembly designed for the AR-15 platform, featuring an 18-inch barrel optimized for the 6.5 Grendel caliber. With a rifle-length gas system, this upper ensures reliable cycling and performance, making it suitable for precision shooting and longer-range applications. Its Flat Dark Earth (FDE) finish adds a tactical aesthetic while providing a durable surface. This upper receiver is commonly found in builds focused on accuracy and versatility, ideal for both competitive shooting and hunting scenarios.
Specifications
M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One - M4E1-T 6.5 Grendel Assem Upper SPR 18"BBL Rifle Threaded FDE
Build history on GunPartPicker
Builders on GunPartPicker first added the Aero Precision M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One - M4E1-T 6.5 Grendel Assem Upper SPR 18"BBL Rifle Threaded FDE to a build in June 2026.
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 $509.49 at BattleHawk Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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