Aero Precision M4E1 300 BLK 16″ Enhanced M-LOK FDE Complete Upper


Fully Assembled and Warrantied by Aero Precision

Availability: In stock

Aero Precision M4E1 300 BLK 16" Enhanced M-LOK FDE Complete Upper

Aero Precision M4E1 300 BLK 16" Enhanced M-LOK FDE Complete Upper is the most efficient way to assemble your own semi-custom firearm; fully assembled and warrantied by Aero Precision.  This complete upper features an M4E1 Upper Receiver, 15" Gen 2 Enhanced M-LOK Handguard, a 16" 300 BLK barrel with a standard birdcage muzzle device, and finished in a flat dark earth Cerakote.

***Does not include Bolt Carrier Group or Charging Handle.

M4E1 Upper Receiver Features:

  • New enhanced forging that gives the upper receiver a "billet look"
  • M4 Feed ramps
  • .250 takedown pin holes
  • Includes port door and forward assist installed

Enhanced Handguard Features:

  • Full top Picatinny rail for optional attachments
  • Quick disconnect sling socket at the 3, 6, and 9 o'clock positions
  • Compatible with low profile gas blocks
  • Compatible with mil-spec AR15 upper receivers and barrels

16" 300 BLK Barrel Features:

  • Material:  Chrome Moly Vanadium
  • Finish: QPQ Corrosion-resistant finish both inside and out.
  • Gas System: Pistol Gas w/ .750 Journal
  • Other: M4 Extension | HP, and MPI Tested
  • Standard A2 flash hider


  • M4E1 Assembled Upper Receiver
  • M-LOK Enhanced Handguard
  • 16" 300 BLK CMV Barrel
  • Low Profile Gas Block and Gas Tube
  • Product comes assembled
  • This complete upper does not include BCG or Charging Handle.
  • The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel.
SKU APAR640252M14
Manufacturer Aero Precision
Made in America Yes
Assembled Yes
Receiver M4E1; M4 Feed Ramps
Barrel 300 BLK; 16" w/ A2 Birdcage Flash Hider
Handguard Free Float; MLOK; Gen 2 Enhanced; 15"
Platform AR15
Finish Flat Dark Earth Cerakote
Gas System Pistol; .750 Diameter

Arm or Ally is a stocking dealer for all Faxon Firearms, Ballistic Advantage, HOLOSUN, Toolcraft, Elftmann Tactical, Timney, CMC Triggers, HIPERFIRE and named the #1 Overall E-Commerce Dealer for Aero Precision Products in 2020!  See our growing inventory of AR Parts, and Reloading Components.

Weight 72 oz
Dimensions 24 × 6 × 6 in
Barrel Length


Gas System


Gas Block Diameter



300 Blackout

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