MPN: APAR610501M1 / APAR610601M1


  • Caliber: .300 Blackout
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Upper Receiver without Forward Assist - 7075-T6 Aluminum
  • Handguard: 7-Inch ATLAS S-ONE M-LOK Handguard or ATLAS R-ONE M-LOK Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 8" 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 center of 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:
    • with ATLAS S-ONE Handguard: ~2.18 lbs.
    • with ATLAS R-ONE Handguard: ~2.20 lbs.
  • Length: ~16.38"


  • AR-15 lower receiver


  • 1x Aero Precision 8" 300 Blackout No Forward Assist Complete Upper Assembly


Aero Precision's 8-inch 300 Blackout upper and included ATLAS R-ONE handguard is the ultimate lightweight upper with great potential to create your ideal tactical weapon.

The Ultimate Framework For Customization

Designed to be low-profile in every way possible, this complete upper features a pistol-length gas tube with a low-profile gas block. By starting with a low-profile and lightweight upper, you have more freedom as you add accessories to improve your weapon's performance.

This complete upper comes with Aero Precision's ATLAS M-LOK Handguard, creating an excellent framework for adding the attachments you need to customize your weapon to your specific tactical needs. The included flash hider is not welded or pinned to the barrel, allowing you to substitute with your preferred muzzle brake easily.

Note that this upper does not include a Bolt Carrier Group or a Charging Handle, giving you the option to use your preferred parts.

Made To Be Reliable

The 8-inch 300 Blackout upper arrives assembled with barrel and handguard; all you have to do is slide your charging handle and bolt carrier group in, getting you to the range with your new toy faster.

To offer a durable upper that you can rely on to defend your family for years to come, Aero Precision completes this upper with a Type III, Class 2, Hardcoat Anodized finish.

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  • This Item: Aero Precision 8" 300 Blackout No Forward Assist Complete Upper Assembly
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    MSRP: $494.99
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