MPN: APAR640251M14 / APAR640252M14


  • Caliber: .300 Blackout
  • Finish: Type III Class 2 Hardcoat Anodized or Cerakoted Flat Dark Earth
  • Upper Receiver: Aero Precision M4E1 Enhanced Upper Receiver - 7075-T6 Aluminum
  • Handguard: 15-Inch Enhanced Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 16" 1:7 QPQ Coated 4150 Chrome Moly Vanadium
  • Muzzle Thread Pattern: 5/8"-24
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Pistol-Length Gas Tube
  • Bolt Carrier Group: Not Included
  • Charging Handle: Not Included
  • HP and MPI Tested

*This upper assembly does not come with Bolt Carrier Group and Charging Handle


  • Weight: ~3.59 lbs.
  • Length: ~24.5"


  • AR-15 lower receiver


  • 1x Aero Precision M4E1 16" 300 Blackout Enhanced Complete Upper Assembly


The Aero Precision M4E1 16-inch 300 Blackout enhanced complete upper assembly has all the most sought-after features to satisfy even the most demanding shooter. The upper is designed to accept AR15/M16 components and comes standard with Aero Precision’s Gen 2 Enhanced Handguard.

Enhanced Aesthetics and Performance

This 300BLK M4E1 comes with many enhanced features. Key features include quick disconnect sling sockets and an enhanced milling design that provides a surer grip and improved visual appeal. The handguard mounting platform is forged into the upper receiver, making this complete upper a much more robust system.

High-Quality Craftsmanship

The low-profile gas block and new profile Picatinny top scalloped rails make it easy for the shooter to carry and handle while making for faster and more precise target acquisition. The barrel is cut from 4150 chrome moly vanadium for strength and is coated with a QPQ corrosion-resistant finish for added durability and attractiveness. The M4 feed ramp extension makes for smooth ammo cycling, and the A2 flash hider helps stay on target by increasing sight picture retention.

Quick and Easy Installation

The Aero 300BLK upper comes with the ejection port door and forward assist already installed and is ready for easy installation with no gunsmithing experience or special tools required. Note that the upper assembly does not come with the bolt carrier group or a charging handle.

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