Aero Precision M4E1 Enhanced Barreled AR-15 Upper 5.56 Rifle Gen 2 – 18″


  • 18” 5.56 NATO barrel
  • 41V50 chrome moly vanadium steel
  • HPT and MPI
  • Nitride finish
  • 1:7 twist rate
  • Rifle 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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SKUAPAR640251M8 Category

The Aero Precision M4E1 Enhanced Barreled AR-15 Upper Receiver is a perfect addition to your AR-15 build. Forged from 7075-T6 aluminum, the receiver is precision machined to M4E1 specs and finished with a hardcoat anodized black finish. The integrated Picatinny rail top allows for easy mounting of optics while the laser engraved T-marks provide a consistent reference point for mounting accessories. The 18” 5.56 barrel is constructed from 4150 chrome moly vanadium steel and features a 1:8 twist rate to deliver exceptional accuracy and reliability. TheMil-Spec phosphate coating provides superior corrosion resistance and durability.

The Aero Precision M4E1 Enhanced Barreled AR-15 Upper is the perfect choice for your next build. This upper features a 18″ 41V50 chrome moly vanadium steel barrel with a Nitride finish and a 1:7 twist rate. It also has an M4 feed ramp barrel extension and is magnetic particle inspected as well as high pressure tested. A standard A2 flash hider is attached to the muzzle.


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