M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver

Aero Precision 8" .300 Blackout Complete Uppers

M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver Product Sku: APPG600211P1

This Complete 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
  • 8" .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 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
  • 1.78" 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
  • 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

8" .300 Blackout Barrel Features:

  • Length: 8"
  • Twist: 1 in 7
  • Muzzle: 5/8x24 Threaded
  • Material: 4150 Crome Moly Vanadium
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas Block: .750
  • Gas Port: .109
  • Gas System Length: Pistol
  • Weight: 18oz
  • M4 Barrel Extension
  • HP and MPI Tested
Made In America? Yes
Platform AR15
Series M4E1
Caliber .300 Blackout
Barrel Length 8"
Weight(s) KeyMod: 39.04 oz / M-LOK: 39.04 oz / Quad Rail: 40 oz
Other No

Customer Reviews

5 Item(s)

Good Product Review by Chad
Contrary to most of what I've heard, customer service was actually pretty good. The upper shipped sooner than I expected and arrived less than a week after I ordered it. It fit on my lower well and was at the range less than an hour out of the box. Only had time to empty a couple mags, but no hiccups. Upper looks nice, seems to function well, and I'm happy. Looking forward to the M5E1 build when I can recover from this 300BLK build. (Posted on 4/19/2018)
Had a problem with my lower. Review by christopher
I have a spikes tactical gen 2 lower, it has custom takedown pins; the front takedown pin would not seat because of the magpul float rail, the problem was easily fixed with a little metal file, however I voided the warrenty of the float rail in the process. I decided to keep my lower because of the ambidextrous controls and the more battle focused functionality of a short barrel rifle, though I will be ordering one of aero's new enhanced lower for my long rifle.
(Posted on 10/16/2017)
Excellent product Review by Mark
Finish on this upper is excellent! The fit and function are awesome, this upper has worked flawlessly for me. AERO IS AWESOME! (Posted on 2/9/2016)
Incredible Value, High Quailty Review by Bill
I initially tried to buy an AAC SBR upper, but fortunately I could never had find an AAC in stock and bought an Aero Precision instead. Not only dd I save $300-$400, the Quailty of my Aero Precision is perfect. I just received my stamp and the upper ran perfectly with both supersonic and subsonic ammo. Highly recommended! (Posted on 8/17/2015)
Excellent Review by Michael
Excellent quality and craftsmanship. SBR runs awesome. I cannot wait to build an AP .308. Great job AP (Posted on 6/18/2015)

5 Item(s)

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