MPN: APAR700305M51 / APAR700705M51


  • 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: 15-Inch ATLAS S-ONE or R-ONE M-LOK Handguard of choice
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 18" 1:8 Twist 416R Stainless Steel Fluted 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

*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: ~3.5 lbs.
  • Overall Length: ~26.44"


  • AR-15 lower receivers


  • 1x Aero Precision 18" Fluted .223 Wylde M4E1 Complete Upper Assembly



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