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

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

Product Code:
Calculated at Checkout
$429.24 - $437.74

MPN: APAR700204P9 / APAR700205P9 / APAR700304M9 / APAR700305M9 /APAR700605P9 / APAR700705M9


  • Caliber: .223 Rem / 5.56 NATO
  • Chamber: .223 Wylde
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Threaded Enhanced Upper - 7075-T6 Aluminum
  • Handguard: ATLAS S-ONE or R-ONE Handguard of choice (KeyMod or M-LOK; Multiple-Lengths)
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 16" 1:8 Twist 416R Stainless Steel
  • 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

*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" Atlas S-ONE Handguard: 3.19 lbs.
    • M4E1 Upper with 15" Atlas S-ONE Handguard: 3.29 lbs.
    • M4E1 Upper with 15" Atlas R-ONE Handguard: 3.37 lb.
  • Length: 24.4"


  • AR-15 lower receivers


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


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.

NOTE: For the protection of our customers and various safety and legal liability reasons, we do not accept returns on ammunition, firearms, barrels, or any product that contains a barrel. Defective firearms, barrels, any product that contains a barrel (ie, complete AR-15 uppers, complete pistol slides, etc.) and ammunition must be returned to the original manufacturer for warranty service. You can have peace of mind that all firearms, barrels, complete uppers, and ammunition that we sell are brand new from the manufacturer, and have never been used, installed, or modified.

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