Aero Precision M4E1 Enhanced Barreled Upper 5.56 Carbine Gen 2 – 10.5″


  • 10.5” 5.56 barrel
  • 4150 CMV barrel
  • HPT and MPI
  • Salt bath Nitride finish
  • 1:7 twist rate
  • Carbine length gas system
  • M4E1 Enhanced forged 7075-T6 upper
  • Hardcoat anodized
  • Laser engraved T-marks
  • Scalloped picatinny top rail
  • Built in anti-rotation tabs
  • M-LOK slots
  • Forged handguard mount
  • Compatible with most BAR-system handguards
  • Does not include BCG or charging handle


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SKUAPAR640221M2 Category

Note: This barreled upper receiver assembly has a barrel length under 16” and is therefore subject to all NFA rules and regulations. Know your local laws before purchasing.

The Aero Precision AR-15 barreled upper receiver is a top-of-the-line product that is designed to provide superior performance. The receiver is forged from 7075-T6 aluminum and precision machined to M4E1 specs, ensuring a perfect fit with Mil-Spec and aftermarket parts. It features a matte black hardcoat anodized finish and laser engraved T-marks on the upper Picatinny rail. This 10.5” 5.56 barreled upper comes with the Enhanced Gen 2 M-LOK free float handguard, which offers improved ergonomics, a lightweight design, and scalloped Picatinny top rail.

This 10.5” barrel is crafted from 4150 Chrome Moly Vanadium steel and features a salt bath Nitride finish, making it extremely resistant to wear and tear. It also has a carbine length gas system and a 1:7 twist rate, making it ideal for firing heavier bullets. Plus, the M4 feed ramp barrel extension ensures smooth, reliable feeding.


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