The Aero Precision M4E1 5.56x45mm carbine upper receiver is delivered fully assembled, excluding the bolt carrier group and charging handle, which are often replaced by AR-15 enthusiasts seeking customization. This receiver merges the distinctive aesthetics of a custom billet receiver with the cost-effectiveness and compatibility of "mil-spec" parts found in a forged receiver. It is equipped with Aero Precision's latest Gen 2 enhanced M-LOK handguard creating a robust, monolithic platform for accessory mounting. The full-length picatinny top rail extends from the rear of the receiver across the entire handguard offering ample M-LOK accessory attachment slots and QD sling swivel sockets positioned at the 3, 6 and 9 o'clock positions. Additionally, the milled texture on the flats enhances grip and contributes to the firearm's unique appearance.

Receiver constructed from forged 7075-T6 aluminum, featuring a MIL-A-8625 type III class 2 hardcoat anodized finish
1/4 inches diameter pivot and takedown pin holes
Ejection port cover and forward assist have been installed
Carbine length gas system featuring a low-profile gas block
Barrel constructed from 4150 chrome-molybdenum-vanadium steel, featuring a 1:7 twist rifling and finished with a black QPQ coating
A2-type flash suppressor
The handguard features an internal diameter of 1.78 inches, accommodating the majority of muzzle devices and suppressors with a diameter of up to 1-1/2 inches

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All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.