Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver 5.56 Mid-Length - Atlas S-One - 14.5"
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Aero Precision
Overview
The Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver is a complete upper designed for the AR-15 platform, featuring a 14.5-inch barrel optimized for 5.56 NATO caliber. With a mid-length gas system, this upper offers improved recoil management and reliability, which is ideal for a variety of shooting applications. Builders often incorporate this upper into builds that prioritize a balanced shooting experience with a focus on accuracy and performance in the 5.56 platform.
Specifications
Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver 5.56 Mid-Length - Atlas S-One - 14.5"
Build history on GunPartPicker
Builders have been adding the Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver 5.56 Mid-Length - Atlas S-One - 14.5" to their builds on GunPartPicker since February 2026. All time, it ranks #458 of the 1,636 upper receivers builders have added. 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 $574.99 at Optics Planet for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 13 builds that include this one
Aero Precision M4E1 Lower Complete W/ MOE SL Grip & SL Stock
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
Rise Armament Advanced Performance Trigger, Red - RA-535-RED-ARP
LMT Defense Semi Auto 5.56 NATO Complete Bolt Carrier Group
M-LOK BCMGUNFIGHTER Short Vertical Grip Polymer Black
Mdt Skeleton Carbine Stock With Cheek Riser 9.75in Black
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