Aero Precision M4E1 Pencil Mid-Length Complete Upper – 16″ 5.56

Aero Precision M4E1 Pencil Mid-Length Complete Upper – 16″ 5.56


Buy Now!

SKU: APPG600231P39


M4E1 Pencil Mid-Length Complete Upper – 16″ 5.56

Manufactured and Assembled in the USA by Aero Precision

This M4E1 Pencil Mid-Length Complete Upper Receiver Handguard Combo now includes our 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. ? Pencil contoured barrel for those wanting a lighter weight rifle.

Does not include Bolt Carrier Group or Charging Handle


M4E1 Upper Receiver

  • 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)
  • Fully Assembled with ejection port cover and forward assist
  • Accepts Standard AR15/M16 components
  • Handguard mounting platform forged into the receiver
  • Works with Aero Precision handguards but also fits most BAR-system handguards
  • Barrel nut and wrench included

Gen 2 Enhanced Handguard Features

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

16″ 5.56 Pencil Mid-Length Barrel Features

  • 5.56 NATO 16″ Mid-length, 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

Item#: APPG600231P39
Manufacturer: Aero Precision
Barrel Length: 16″
Handguards: Gen 2
Weight: 12″ Range 45.10oz – 49.90oz | 15″ Range 46.7oz – 52.46oz
Other: Bolt Carrier Group NOT included.
MSRP: $434.99

Additional information

Weight50 oz
Dimensions5 × 5 × 30 in

Aero Precision

Part Type

Upper Receiver Parts



Barrel Finish

CPQ Corrosion Resistance

Barrel Length



5.56 NATO


4150 Chrome Moly Vanadium

Twist Rate


Enjoy Free Shipping!
Purchase any of the products in our FREE SHIPPING category and your ENTIRE ORDER ships for FREE!