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
October 2026 so far on GunPartPicker
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel w/ 15" ATLAS R-ONE M-LOK Handguard - FDE ranks #41 of the 716 upper receivers builders have added on GunPartPicker so far in October 2026, behind the Spike's Tactical Flat Top Upper w/ Ejection Port Door, 9MM, Black - SFT902D, with about 1 in every 250 upper receivers added to builds. Up from #168 in September. 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 September 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 37 retailers
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