M4E1 Threaded 16" 5.56 Mid-Length Complete Upper Receiver w/ R-ONE Handguard
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Aero Precision
Overview
The Aero Precision M4E1 Threaded 16" 5.56 Mid-Length Complete Upper Receiver is a fully assembled upper designed for AR-15 platforms, featuring a 16-inch barrel optimized for the 5.56 NATO caliber. With a mid-length gas system, it provides a smoother cycling action and reduced recoil, making it ideal for both precision shooting and general use. This upper is commonly found in a variety of builds, particularly those focused on versatility and reliability in tactical scenarios.
Specifications
M4E1 Threaded 16" 5.56 Mid-Length Complete Upper Receiver w/ R-ONE Handguard
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September 2026 on GunPartPicker
Aero Precision M4E1 Threaded 16" 5.56 Mid-Length Complete Upper Receiver w/ R-ONE Handguard ranked #66 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since March 2026. All time, it ranks #68 of the 1,654 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.
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