Aero Precision Complete M4E1 Upper 12.5" 5.56 Mid-Length Upper

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  • Aero Precision Complete M4E1 Upper 12.5" 5.56 Mid-Length Upper
  • Aero Precision Complete M4E1 Upper 12.5" 5.56 Mid-Length Upper
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The Aero Precision AR-15 barreled upper receiver is built around the M4E1 Threaded upper receiver designed for use with standard barrel nut systems. The receiver is forged from 7075-T6 aluminum and precision machined to M4E1 specs to ensure proper fit with Mil-Spec and aftermarket parts. It is matte black hardcoat anodized and features laser engraved T-marks on the upper picatinny rail. This 12.5” 5.56 barreled upper comes with the Atlas R-One M-LOK free float handguard with full length picatinny top rail and slime 1.3" inner diameter.


  • 12.5” 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
  • Does not include BCG or charging handle

The 5.56 12.5” barrel is machined from 4150 Chrome Moly Vanadium steel with a salt bath Nitride finish, a pistol length gas system, and a 1:7 twist rate for heavier bullets. It has an M4 feed ramp barrel extension and is magnetic particle inspected as well as high pressure tested. A standard A2 flash hider with 1/2x28 threading is attached to the muzzle.

Aero Precision takes some of the most state-of-the-art manufacturing techniques and equipment derived from their work in the aerospace industry and applies it to their products in the firearms industry. They have utilized their knowledge from years of building aircraft components to design and engineer AR-15 handguards, receiver sets, scope mounts, and more. They treat every product as if it were a precision flying machine and adhere to strict quality standards to ensure law enforcement, military, and civilian customers receive a product they can rely on.

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