Open Box Aero Precision M4E1 Threaded Assembled Upper Receiver for AR-15

Used/Open Box Item: This product is not eligible for return. Click to learn more about used products.

Original price was: $134.99.Current price is: $123.22.


Product Summary

The M4E1 Threaded Upper Receiver features a new angular machined design that helps it stand apart from standard mil-spec upper receivers.

  • New enhanced forging that gives the upper receiver a “billet look”.
  • New picatinny profile that blends seamlessly with our Enhanced and ATLAS Series Handguards.
  • M4 Feedramps.
  • .250 takedown pin holes.
  • Includes threaded forward assist roll pin.
  • Made In America.
  • Platform: AR15.
  • Material: Machined from 7075-T6 forged aluminum.
  • Compatibility: Works with standard AR15/M16 components.
  • Weight(s): 8.65 oz.
  • Other: Barrel Nut Torque – 50 ft-lbs.
  • Includes port door and forward assist.


Technical Information


7075 Aluminum



Firearm Compatibility

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit