MPN: APAR640231M5 / APAR640231M32


  • Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized
  • Upper Receiver: Aero Precision M4E1 Enhanced Upper - 7075-T6 Aluminum
  • Handguard: 12-Inch Gen 2 Enhanced M-LOK Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 14.5" 1:7 QPQ Coated 4150 Chrome Moly Vanadium Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Carbine or Mid-Length Gas Tube
  • Bolt Carrier Group: Not Included
  • Charging Handle: Not Included
  • MPI and HP Tested

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

*This upper receiver assembly has a barrel that is shorter than 16". This upper is only for use on AR pistol lower receivers and NFA registered Short-Barreled Rifle (SBR) lower receivers. All NFA laws apply!


  • Weight: ~3.2 lbs.
  • Length: ~23"


  • AR-15 lower receiver


  • 1x Aero Precision 14.5" 5.56 M4E1 Enhanced Complete Upper Assembly


If you want to build an AR with a tried and tested 5.56 caliber, then this Aero Precision M4E1 Enhanced 14.5” Upper Receiver is your solution. Rifles of this caliber will prove extremely useful to you in home defense, hunting, and target practice. Almost every gun enthusiast owns a rifle chambered in 5.56 due to its plethora of use cases.

Tough Steel, Enhanced Grip, and Reliable

The 14.5” barrel is made of Chrome Moly Vanadium steel. The best of its kind, which is used in Mil-Spec rifles, making your rifle tougher, corrosion and heat resistant. The Gen-2 enhanced handguard has three quick disconnect sling sockets that ensure your gun is hanging by you and battle ready in any environment. Aero Precision has managed to provide a continuous Picatinny top rail and additional milling on the flats for good ergonomics while making sure your rifle looks good.

The barrel being high-pressure tested and magnetic particle inspected to ensure quality means that it has been tested for minor fractures, cracks, or imperfections. This ensures that you have a barrel of impressive quality and reliability.


5.56 rounds have withstood the test of time and have been used by militaries worldwide in numerous conflicts ranging from close-quarter combat to long-range fights. Anti-rotation tabs prevent rail rotation and give you peace of mind in catastrophic conditions.

The 1.78" inside diameter can accommodate most muzzle devices and 1.5" suppressors, making your rifle ready for any situation. The M4 feed ramps aid in reliable chambering of the rounds, reducing the chances of a misfire to a minimum; in case the round doesn't chamber, forward assist is installed as well to help. You won't ever regret making a rifle out of this upper!

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