M4E1 Threaded Complete Upper, 13.9" 5.56 CMV Mid-Length Barrel w/ 12.7" R-ONE M-LOK Handguard

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Aero Precision

Overview

The Aero Precision M4E1 Threaded Complete Upper features a 13.9" barrel chambered in 5.56 NATO, designed for a mid-length gas system which promotes smoother cycling and reduced recoil. This complete upper assembly includes the M4E1 receiver, known for its enhanced aesthetics and functionality, making it a solid choice for builders looking for a reliable and visually appealing upper. This upper is commonly utilized in builds focused on compact versatility for both tactical and shooting sports applications.

Specifications

MPNAPPG700704M99

PlatformAR-15

Receiver TypeM4E1

Caliber5.56 NATO

Gas System LengthMid-Length

AssemblyComplete

Barrel Length13.9

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M4E1 Threaded Complete Upper, 13.9" 5.56 CMV Mid-Length Barrel w/ 12.7" R-ONE M-LOK Handguard

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September 2026 on GunPartPicker

Aero Precision M4E1 Threaded Complete Upper, 13.9" 5.56 CMV Mid-Length Barrel w/ 12.7" R-ONE M-LOK Handguard ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026.

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Updated Oct 12, 2026 · from real builds on GunPartPicker