Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Rifle Atlas R-One – 18″


  • 18” 5.56 NATO
  • 4150 Chrome Moly Vanadium barrel
  • HPT and MPI
  • Black Nitride finish
  • 1:7 twist rate
  • Rifle length gas system
  • M4E1 Threaded 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


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SKUAPAR700705M8 Category

If you’re looking for a top quality AR-15 barreled upper receiver, then you need to check out the Aero Precision M4E1 Enhanced Barreled Upper. This receiver is built around the M4E1 Threaded Upper Receiver, which is designed for use with standard barrel nut setups. 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 finished with a matte black hardcoat anodized finish and features laser engraved T-marks.

The Aero Precision M4E1 is a high-quality, reliable AR-15 upper that is sure to give you an edge on the competition. This Enhanced Barreled Upper Receiver comes with a 5.56 NATO 18” barrel that is made from 4150 CMV steel and has a salt bath Nitride finish. It also features a rifle length gas system, and a 1:7 twist rate. The M4 feed ramp barrel extension and magnetic particle inspection ensure that this upper receiver is tough and ready for action. The attached A2 flash hider with 1/2×28 threading protects the muzzle, while the Picatinny rail on the top of the receiver provides a mounting platform for your favorite optics.


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