MPN: APAR700305M39 / APAR700705M39


  • Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: ATLAS S-ONE or R-ONE Handguard of choice
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 16" 1:7 QPQ Coated 4150 Chrome Moly Vanadium Pencil Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block: Aero .625" Low-Profile Gas Block
  • Gas Tube: Mid-Length Gas Tube
  • Bolt Carrier Group: Not Included
  • Charging Handle: Not Included
  • HP and MPI Tested
  • Pencil Profile

*This upper assembly does not come with Bolt Carrier Group and Charging Handle

*ATLAS S-ONE Handguard: Front and rear picatinny rail section. Eliminated center of top rail for weight reduction.

*ATLAS R-ONE Handguard: Full top picatinny rail


  • Weight: ~2.93 lbs.
  • Length: ~24.4"


  • AR-15 lower receiver


  • 1x Aero Precision 16" M4E1 5.56 Mid-Length Pencil Complete Upper


On any rifle, the weight is a significant attribute that can affect its handling, accuracy, and overall effectiveness. A lightweight rifle is more maneuverable and easy to control, and if you are looking for a light AR-15, you should check out the M4E1 5.56 Mid-Length Pencil Complete Upper Assembly by Aero Precision.

Lightweight Pencil Profile Barrel

This Upper comes with a pencil profile 16-inch barrel made from super strong and durable Chrome Moly Vanadium and is QPQ coated for strength. The barrel has a 1/2"-28 thread on the muzzle and comes equipped with a standard A2 style birdcage flash hider.

Low-Profile Design

The upper assembly is a low-profile gas block, and a mid-length gas tube to go with the 16-inch barrel. It uses a low-profile handguard, and you have the choice of either the Aero Precision ATLAS S-One or R-One handguard, both of which have M-LOK slots on the side and the bottom. The R-One has a continuous Picatinny rail on the top, whereas the S-One is the lighter option, with two small Pic rail sections for mounting iron sights.

The receiver is made from 7075-T6 Aluminum and features a forward assist and port door. The receiver has a hardcoat anodized finish and features M4 feed ramps for better reliability. The barrel on this upper assembly are HP and MPI tested to clear any minor imperfections.

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  • This Item: Aero Precision 16" M4E1 5.56 Mid-Length Pencil Complete Upper
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    MSRP: $660.00
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