Aero Precision M4E1 16″ 5.56 Mid-Length Complete Upper Receiver

Original price was: $514.99.Current price is: $437.74.


Product Description

This Complete Upper includes Aero’s Gen 2 Enhanced Handguard. Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal, and a new profile for the Picatinny top rail.


  • M4E1 Enhanced Assembled Upper Receiver.
  • Gen 2 Enhanced Handguard.
  • 16″ 5.56 Mid-Length CMV Barrel.
  • Low Profile Gas Block and Mid Length Gas Tube.
  • The product comes assembled.
  • This complete upper does not include BCG or Charging Handle.

M4E1 Upper Features:

  • Forged from 7075 T6 aluminum.
  • Precision machined to M4E1 specs.
  • M4 feedramps.
  • Matte black hard-coat anodized Mil 8625 Type 3 Class 2.
  • Laser engraved T-marks (Anodized only).
  • Comes assembled, with the port door and forward assist installed.
  • Accepts standard AR15/M16 components.
  • The handguard mounting platform is forged into the receiver.
  • Works with Aero Precision handguards but also fits most BAR-system handguards.
  • Barrel nut and wrench are included.

Gen 2 Enhanced Handguard Features:

  • 1pc free float design.
  • Built-in anti-rotation tabs.
  • Scalloped rails.
  • Continuous top rail.
  • 1.78″ inside diameter fits most muzzle devices and 1.5″ suppressors.
  • Compatible with low-profile gas blocks.
  • Gen 2 Feature – Quick disconnect sling socket at the 3, 6, and 9 o’clock positions.
  • Gen 2 Feature – Additional milling along flats to aid with gripping and add visual appeal.
  • Gen 2 Feature – New profile for the continuous Picatinny top rail.

16″ 5.56 Mid-Length Barrel Features:

  • 5.56 Nato 16″ Midlength, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled.
  • .750 gas block journal.
  • Midlength gas system, .0785 gas port.
  • M4 Feed Ramp Extension.
  • HP and MPI tested.
  • Standard A2 flash hider.




Technical Information

Firearm Compatibility
Caliber 5.56 NATO / .223 Remington
Size 16"

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