Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel w/ 15" ATLAS R-ONE M-LOK Handguard - FDE
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Aero Precision
Overview
The Aero Precision M4E1 Threaded Complete Upper features a 16-inch barrel chambered in 5.56 NATO, designed for compatibility with the AR-15 platform. With a mid-length gas system, this upper ensures smoother cycling and reduced recoil, which can significantly enhance accuracy and shootability. Builders seeking a well-rounded upper for various applications, including tactical and competitive shooting, will find this configuration commonly used in builds that prioritize the mid-length gas system and 5.56 NATO caliber.
Specifications
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel w/ 15" ATLAS R-ONE M-LOK Handguard - FDE
August 2026 on GunPartPicker
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel w/ 15" ATLAS R-ONE M-LOK Handguard - FDE was the sixth most added upper receiver on GunPartPicker in August 2026, behind the Spike's Tactical AR-15 Upper Receiver Assembly, with about 2% of all upper receivers added to builds. Down from #5 in July. Builds with this upper receiver are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and nearly all AR-15.
It was out of stock everywhere we track for all of August 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $593.99 at AR15 Discounts for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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