MPN: APAR700706M76 / APAR700716M76


  • Caliber: 5.56 NATO / .223 Rem.
  • Chamber: .223 Wylde
  • Finish: Type III Class 2 Hardcoat Anodized or Cerakoted Flat Dark Earth
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: 16.6" ATLAS R-ONE M-LOK Handguard of choice
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 18" 1:8 QPQ Coated 416R Stainless Steel Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Rifle-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: ~4.11 lbs.
  • Length: ~26.5"


  • AR-15 lower receiver


  • 1x Aero Precision 18" M4E1 .223 Wylde QPQ Stainless Steel Complete Upper Assembly


The M4E1 .223 Wylde Complete Upper Assembly from Aero Precision has several incredible features that make it stand out from the competition and it is an excellent option for anyone building a modern AR-15 rifle.

Quality Parts

The Aero Precision M4E1 .223 Wylde Complete Upper Assembly comes with a full aluminum receiver, which has a forward assist and a port door. This perfectly designed upper receiver can work with any Mil-Spec bolt carrier group and also features M4 feed ramps for better reliability.

The barrel on this upper assembly is made from a 416R stainless steel and is QPQ coated for longevity and corrosion resistance. The barrel is 18 inches long and has a 1:8 twist rifling. Moreover, the barrel comes equipped with an A2 style flash hider, which can be replaced by any other muzzle device of your choice using the 1/2"-28 muzzle threads. The gas system on this upper assembly has a low profile and uses a rifle-length gas tube.

Modern M-LOK Handguard Ready for Accessories

You also get a modern handguard with this upper assembly. It comes with the ATLAS R-ONE M-LOK Handguard which is made from high-grade aluminum and are 16.6 inches long. They have M-LOK slots at 3,6, and 9 o'clock, and the R-One handguard has a complete upper Picatinny rail, whereas the S-one only has two small sections of Picatinny rail on the top to save weight, and has a space for mounting iron sights.

Overall, the Aero Precision M4E1 .223 Wylde Complete Upper Assembly is ideal for a high-quality AR build.

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