MPN: APAR700304M9 / APAR700305M9 /APAR700704M9 / APAR700705M9


  • Caliber: .223 Rem / 5.56 NATO
  • Chamber: .223 Wylde
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: ATLAS S-ONE or R-ONE Handguard of choice
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 16" 1:8 Twist 416R Stainless Steel Barrel (Government Profile) 
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: 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

*ATLAS S-ONE Handguard: Front and rear picatinny rail section. Eliminated center of top rail for weight reduction.

*ATLAS R-ONE Handguard: Full top picatinny rail


  • Weight:
    • M4E1 Upper with 12" Handguard: 3.25 lbs.
    • M4E1 Upper with 15" Handguard: 3.37 lbs.
  • Length: 24.4"


  • AR-15 lower receivers


  • 1x Aero Precision 16" Mid-Length .223 Wylde M4E1 Complete Upper Assembly


If you’re looking for a .223 Wylde complete upper with the accuracy of a precision rifle, your search has ended! The M4E1 16” .223 Wylde complete upper assembly by Aero Precision has everything you’re looking for in a quality upper assembly.

This 16-inch M4E1 AR upper receiver is machined from 7075-T6 aluminum for superior strength and durability. The built in anti-rotation tabs in the handguard provide extra support and to help maintain accuracy during extended shooting. The handguard itself is the Aero Precision ATLAS S-ONE handguard. The receiver and the handguard are finished in Type III hardcoat anodized matte black for optimal corrosion resistance. The handguard features QD sling sockets at 3, 6, and 9 o'clock positions for easy sling attachment. Aero's proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.

The Aero 16” 416R steel barrel is precision-machined from a premium stainless steel blank and was given four quality inspections to ensure match-grade quality. You don’t need to worry about poor accuracy or sub-par performance when it comes to a Aero barrel! Chambered in .223 Wylde, this barrel can safely fire 5.56 NATO and .223 Remington loads. Get your Aero Precision AR-15 .223 Wylde complete upper today and give yourself an edge.

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  • This Item: Aero Precision 16" Mid-Length .223 Wylde M4E1 Complete Upper Assembly
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