M4E1 Enhanced 16" .300 Blackout Complete Upper Receiver

Aero Precision 16" .300 Blackout Complete Uppers

M4E1 Enhanced 16" .300 Blackout Complete Upper Receiver Product Sku: APPG600231P14

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
  • 16" .300 Blackout CMV Barrel
  • Low Profile Gas Block and Pistol 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 (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

Barrel Features:

  • Chamber: .300 Blackout
  • Length: 16"
  • Material: 4150 Chome Moly Vanadium
  • Finish: QPQ Corrosion Resistant Finish
  • Gas System Length: Pistol
  • Gas Block Journal: .750"
  • Twist Rate: 1:7 Inches
  • Muzzle: 5/8x24 Threaded
  • Weight: 29oz
  • Other; M4 Feed Ramp Extension, HP and MPI Tested, Standard A2 Flash Hider
Made In America? Yes
Platform AR15
Series M4E1
Caliber .300 Blackout
Barrel Length 16"
Weight(s) 12" KeyMod - 54.08 oz / 12" M-LOK - 54.08 oz / 12" Quad Rail - 56.64 oz / 15" KeyMod - 56 oz / 15" M-LOK - 56 oz / 15" Quad Rail - 58.56 oz
Other No

Customer Reviews

8 Item(s)

BUY IT!!!! Review by Nick
I purchased my upper over Labor Day weekend and got it that Wednesday. Fast shipping and was in great condition. Also, I'm not sure if it's included in every order or just a gift but I was also send an armorers wrench. I've put 200 rounds through it yesterday and it was great! Only flaw I would mention is the packaging was very bland but nothing major and I would like the engraving "A" for Aero precision on the hand guard bigger or painted just for show. Overall great product (Posted on 9/11/2017)
Great deal Review by mario
Got it on sale for presidents day. Put 40 rounds of Remington 120 grain through it and no problems. Just slapped it on my sig m400 and no issues. Fast shipping too, ordered it Friday, got it the following Thursday with free shipping! (Posted on 2/26/2017)
Like Butter Review by B-Man CA
Finally got to fire this bad boy. LOVE IT! I had bought the FDE lower from Aero and after hemming and hawing over what dress to put on it like a school girl (couldn't decide btwn 223 Wylde or 300) I put my big boy pants on got the 300. Awesome! Barely kicked as far as I felt and functioned like a champ. Beautiful fit n finish and the boys at the range were jealous. Will save my duckets for the Wylde upper next. Would go the 308 lower and upper next but missed my window. CA sux. Must move! (Posted on 12/28/2016)
Outstanding Review by Michael
Perfect upper (Posted on 11/28/2016)
GOOD TO GO! Review by Beau
This is my second Aero build now and both builds turned out extremely well.....accurate and reliable. No need to keep looking at other reviews on other websites.....get this one and be done with it! (Posted on 8/26/2016)
excellent Review by Thomas
I purchased mine in January. just fired a magazine down the pipe with factory Remington 120gr...NO HANGUPS< perfect function. If i get another upper it will be aeroprecision. out fo the box i hit every time offhanded. (Posted on 2/20/2016)
Awesome Review by Ian
I just purchased this upper and haven't got a chance to run any rounds through it yet but i can already tell the build quality is superb. Will definitely buy another from Aero. (Posted on 1/22/2016)
Amazing! Review by Laz
Guys, I have to tell you that the craftsmanship on this complete upper is amazing!! Thanks Aero Precision for making such a great quality product. (Posted on 12/18/2015)

8 Item(s)

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