MPN: APAR700302M4 / APAR700312M4 / APAR700702M4 / APAR700712M4


  • Caliber: .300 Blackout
  • Finish: Type III Class 2 Hardcoat Anodized or Cerakoted Flat Dark Earth
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: 9.2-Inch ATLAS S-ONE or R-ONE Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 10" 1:7 QPQ Coated 4150 Chrome Moly Vanadium
  • Muzzle Thread Pattern: 5/8"-24
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Pistol-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 the center of the top rail for weight reduction.

*ATLAS R-ONE Handguard: Full-top Picatinny rail

*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: ~2.68 lbs.
  • Length: ~18.31"


  • AR-15 lower receiver


  • 1x Aero Precision .300 Blackout Complete Upper Assembly


If you need a complete .300 blackout upper assembly for your AR-15, this M4E1 .300 Blackout Upper by Aero Precision is for you.

The Aero Precision M4E1 upper receiver is seamlessly connected to the top rails of the ATLAS handguard for stellar performance during extended shooting. It is made from 7075-T6 aluminum for longevity and durability. Made to standards higher than military requirements, this Aero Precision .300 Blackout Upper will give your rifle that coveted “edge.” The handguard features M-LOK slots at three, six, and nine o’clock positions, while the top Picatinny rail sections provide ample room for your accessories.

The Chrome Moly Vanadium .300 Blackout barrel underwent a rigorous examination that included four separate tests before it was given the green light to be packaged and sent out. Because of Aero’s commitment to excellence, this 10” barrel will last you for many years of shooting pleasure.

This Aero Precision 300 Blackout Upper does not come with a bolt carrier group and charging handle, so you can choose the BCG and charging handle that you want without wasting money. Don’t skimp on your 10" complete 300 Blackout upper. Purchase from a trusted brand to ensure reliable operation when it matters most!

What is 300 Blackout? What are the benefits of the 300 Blackout cartridge? For more information about the 300 Blackout cartridge, please see "What to Know About 300 Blackout."

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