MPN: APAR700704M5V38


  • Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Upper - 7075-T6 Aluminum
  • Handguard: 12.7-Inch ATLAS R-One M-LOK Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: VG6 Gamma 556SL Muzzle Device
  • Barrel: 14.5" 1:7 QPQ Coated 4150 Chrome Moly Vanadium Barrel w/ Pinned VG6 Gamma 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


  • Weight: ~2.97 lbs.
  • Length: ~23.38"


  • AR-15 lower receiver


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


Aero Precision is a brand known for making some high-end AR-15 parts, and their M4E1 Complete Upper Assembly is no exception. This upper assembly is designed with a 14.5" barrel, which has a pinned Gamma 556SL muzzle device that completes its 16" legal length for a rifle.

The barrel is made from Mil-Spec 4150 Chrome Moly Vanadium steel, which has better strength, high heat performance, and corrosion resistance than a standard steel barrel. In addition, the barrel comes with a pinned VG6 Gamma 556 SL Muzzle Device, which has an angled three-port design and significantly decreases perceived recoil and muzzle rise. This upper assembly has a low-profile mid-length gas tube.

You get a modern 12.7-Inch ATLAS M-LOK Handguard with this Aero Precision upper assembly. The handguard has M-LOK slots on both sides and the bottom, whereas it has a continuous Picatinny rail on top.

The receiver is made from 7075-T6 Aluminum, and it is compatible with any standard Mil-Spec bolt carrier group and lower. It features a forward assist and port door and has M4 feed ramps to improve reliability.

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  • This Item: Aero Precision 14.5" 5.56 M4E1 Complete Upper Assembly with Pinned Gamma 556SL
    MSRP: $539.99
    (You save $81.00 )

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