MPN: APAR700304M68 / APAR700704M68


  • Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: 12.7-Inch ATLAS S-ONE or R-ONE M-LOK Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: VG6 Epsilon 556SL Muzzle Device
  • Barrel: 14.5" 1:7 QPQ Coated 4150 Chrome Moly Vanadium Barrel w/ Pinned VG6 Epsilon 556SL (16"+ overall length)
  • 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: ~2.88 lbs.
  • Length: ~23.33"


  • AR-15 lower receiver


  • 1x Aero Precision 14.5" 5.56 M4E1 Complete Upper Assembly with Pinned Epsilon 556SL


This high-quality, functional, stylish upper assembly is designed to give you greater control of how your firearm looks and increase the amount of control that you have over how your gun operates. Whether you’re customizing an existing gun or building your own from scratch, this 14.5” upper is exactly what you need to take your shooting experience to the next level.

What’s Included?

In the M4E1 threaded 14.5” complete upper assembly, you’ll receive a 14.5” 5.56 Mid-length CMV barrel with a pinned VG6 Epsilon 556SL to give you a 16" legal length barrel, a 12.7” M-LOK Atlas Handguard, and a low profile gas block with Mid-length gas tube. Perhaps most importantly, the entire upper assembly comes completely assembled, meaning that it’s ready for you to install and start using.

Additional Upper Receiver Features

The new enhanced forging process not only makes the upper receiver more durable, but also gives it a billeted look which tactical enthusiasts love when swapping out their upper assembly. Additionally, the new Picatinny profile that blends seamlessly with our enhanced series handguards make it even easier to improve the aesthetic of your firearm. Those who are looking for a more tactical feel for their weapon love the fact that this upper assembly is compatible with mil-spec AR15 upper receivers and barrels.

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  • This Item: Aero Precision 14.5" 5.56 M4E1 Complete Upper Assembly with Pinned Epsilon 556SL
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    MSRP: $725.00
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