M4E1 16" 5.56 Pencil Mid-Length Barrel Complete Upper Receiver

Aero Precision 16" 5.56 Mid Pencil Length Complete Uppers

M4E1 16" 5.56 Pencil Mid-Length Barrel Complete Upper Receiver Product Sku: APPG600231P39

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This 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.


  • M4E1 Assembled Upper Receiver
  • Enhanced Handguard of choice
  • 16" 5.56 CMV Barrel
  • Low Profile Gas Block and Mid Pencil Length Gas Tube
  • Product comes assembled
  • This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the Finish Your Build tab

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
  • Comes assembled, with port door and forward assist installed
  • Accepts standard AR15/M16 components
  • 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
  • 1.72" 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 Pencil Barrel Features:

  • 5.56 Nato 16" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Mid-length gas system, .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider
Made In America? Yes
Series M4E1
Chamber 5.56 NATO
Barrel Length 16"
Weight(s) KeyMod 12": 45.10 oz / M-LOK 12": 44.84 oz / Quad Rail 12": 49.90 oz | KeyMod 15": 46.70 oz / M-LOK 15": 47.34 oz / Quad Rail 15": 52.46 oz

Customer Reviews

1 Item(s)

Great but.. Review by Nack
Overall great product! Finish is really nice.

Only one thing, they didn't include the barrel wrench as stated in discription and contacted customer they still said it wasn't included even tho its stated in the discription. Oh well.. (Posted on 12/13/2016)

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