Aero Precision M4E1 Enhanced 10″ .300 Blackout Pistol Length Complete Upper w/ 9.3″ Enhanced HG, Adjustable Gas Block, BREACH Charging Handle, PRO BCG – Anodized Black

Aero Precision M4E1 Enhanced 10″ .300 Blackout Pistol Length Complete Upper w/ 9.3″ Enhanced HG, Adjustable Gas Block, BREACH Charging Handle, PRO BCG – Anodized Black

Build a better AR-15 without the hassle of assembling an upper from scratch. This M4E1 Enhanced complete upper from Aero Precision comes assembled with a 10″ .300 Blackout barrel running a pistol-length gas system and a 9.3″ Enhanced M-LOK handguard, all finished in durable Anodized Black. It installs on any mil-spec AR-15 lower receiver in minutes.

.300 Blackout delivers .30-caliber energy from a short barrel and is a favorite for suppressed shooting, home defense and compact builds.

Key Features

• M4E1 Enhanced design: the receiver and handguard are made to work together, reducing flex and creating a seamless top rail.
• 9.3″ Enhanced M-LOK handguard: a free-floating M-LOK handguard that mates with Aero’s enhanced receiver design for a rigid, gap-free fit.
• Adjustable gas block: tune the gas system for suppressed or unsuppressed shooting.
• Bolt carrier group and charging handle included: a ready-to-run upper out of the box.
• Made in the USA by Aero Precision in Lakewood, Washington.

Specifications

• Brand: Aero Precision
• Platform: AR-15
• Series: M4E1 Enhanced
• Caliber: .300 Blackout
• Barrel Length: 10″
• Gas System: Pistol-Length
• Handguard: 9.3″ Enhanced M-LOK (free-float)
• Forward Assist: Yes
• Finish: Anodized Black
• Made in USA: Yes

Installation

Make sure the firearm is unloaded. Open the pivot and takedown pins on your AR-15 lower, seat the upper’s front lug in the pivot pin hole, close the receivers and push both pins home. Install the remaining components for your build, then perform a full function check before live fire. If you are unsure at any step, have a qualified gunsmith complete the installation.

Compatibility

Designed for mil-spec AR-15 lower receivers, including Aero Precision M4E1 and standard AR-15 lowers. It runs with a standard 5.56 bolt carrier group and standard AR-15 magazines (many shooters prefer .300 BLK-specific mags for heavy subsonic loads). Mark your .300 BLK magazines so they are never mixed with 5.56 ammunition.

Frequently Asked Questions

Does this complete upper include a bolt carrier group and charging handle?
Yes. This upper ships with a bolt carrier group and charging handle, so it is ready to install on your lower.

Will it fit my lower receiver?
Yes, it is built to mil-spec dimensions and fits standard AR-15 lowers, including Aero Precision M4E1 lowers.

What bolt and magazines do I need?
It runs with a standard 5.56 bolt carrier group and standard AR-15 magazines (many shooters prefer .300 BLK-specific mags for heavy subsonic loads). Mark your .300 BLK magazines so they are never mixed with 5.56 ammunition.

Is a 10″ barrel legal on my build?
Barrels under 16″ are regulated under U.S. federal law. Depending on your configuration this upper may need to be used on an AR pistol, on a registered short-barreled rifle, or with a permanently attached muzzle device bringing overall barrel length to 16″. Check federal, state and local law before purchasing.

Does it ship to my state?
Some states and localities restrict certain firearm parts. It is the buyer’s responsibility to confirm the item is legal where they live before ordering.

Disclaimer

Aero Precision, M4E1, ATLAS, R-ONE and S-ONE are trademarks of Aero Precision. Other brand names are trademarks of their respective owners. Specifications and pricing come from the manufacturer and may change without notice. Product images are for illustration. The buyer is responsible for complying with all federal, state and local laws.