M4E1 Enhanced 10″ .300 Blackout Complete Upper Receiver


Shipping to FFL Dealer Required No
Made In America? Yes
Platform AR15
Series M4E1
Caliber .300 Blackout
Barrel Length 10″
Weight(s) KeyMod: 43.20 oz / M-LOK: 43.20 oz / Quad Rail: 44.80 oz
Other N/A
Categories: , Product ID: 6877


This Complete Upper (Aero Precision Blackout Upper) 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 Enhanced Assembled Upper Receiver
  • Enhanced Handguard of choice
  • 10″ .300 Blackout CMV Barrel
  • Low Profile Gas Block and Pistol Length Gas Tube
  • Product comes assembled
  • This assembly does not include BCG or Charging Handle. These products may be selected as add-ons under the FINISH YOUR BUILD tab
  • The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16″ as defined by the ATF for a rifle build.

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 port door and forward assist installed
  • 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 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
  • The Gen 2 Feature – Additional milling along flats to aid with gripping and add visual appeal
  • Its Gen 2 Feature – New profile for the continuous picatinny top rail

10″ .300 Blackout Barrel Features:

  • Length: 10″
  • Twist: 1 in 7
  • Muzzle: 5/8×24 Threaded
  • Material: 4150 Crome Moly Vanadium
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas Block: .750
  • Its Gas Port: .0935
  • The Gas System Length: Pistol
  • Weight: 21oz
  • M4 Barrel Extension
  • HP and MPI Tested




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