M4E1 Enhanced 18" .223 Wylde Quantum Handguard Complete Upper Receiver

Aero Precision 18" .223 Wylde Quantum Handguard Complete Uppers

M4E1 Enhanced 18" .223 Wylde Quantum Handguard Complete Upper Receiver Product Sku: APPG640005P42

This Complete Upper includes our Quantum Handguard! Key features include the addition of built in anti-rotation tabs, removable 4-slot picatinny rail section for front sight and a 7 mounting surface for accessories.


  • M4E1 Enhanced Assembled Upper Receiver
  • Quantum Handguard of choice
  • 18" .223 Wylde Rifle Length Stainless Steel Barrel
  • Low Profile Gas Block and Rifle Length Gas Tube
  • Product comes assembled
  • Thie 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

Quantum Handguard Features:

  • 1pc free float design
  • Removable 4-slot picatinny rail section for front sight
  • Built in anti-rotation tabs
  • 7 mounting surfaces for KeyMod accessories
  • 1.78" inside diameter fits most muzzle devices and 1.5" suppressors
  • Compatible with low profile gas blocks

18" .223 Stainless Steel Rifle Length Barrel Features:

  • .223 Wylde 18" Rifle Length Barrel, 1/8 Twist
  • 416R Stainless Steel
  • Bead Blasted Finish
  • .750 gas block journal
  • Rifle length gas system
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider
Made In America? Yes
Platform AR15
Series M4E1
Caliber .223 Wylde
Barrel Length 18"
Weight(s) 15" KeyMod - 68.96 oz / 15" M-LOK - 68.96 oz
Other No

Customer Reviews

3 Item(s)

Does what it supposed to Review by Luis
Wish I could upload photos showing the group for this upper. I recently built a DMR type AR-15 and since I have never done it before, I was looking to not spend a ridiculous amount of money. Long story short after putting a Leopold rifleman scope and a few other upgrades into my lower in combination with this 18" .223 Wylde I was able to group 0.667 @100 yards with some Hornady 75 grain factory match ammo. (Posted on 9/28/2017)
Great precision upper: with some slight drawbacks that can be remedied at home Review by Brandon
I was surprised at how fast this upper got to me. Very impressed with this upper and how she shoots. Love that rail and how simple it is to take off/put back on.

There are some slight problems with this upper however: the top rail of the handguard won't accept mbus unless you remove some material from the lever of the sight. Took me about 5 mins with a file and it works great on there now. The second issue I had was that the port (measured at 0.093) would not lock back on cheap 223 ammo like Tula and UMC. I was able to remedy this easily by reaming the hole out 0.003" to 0.096". This could also be because I am running a carbine buffer for collapsible stock and a full auto bcg. It is 100% now and I am in love with it.

I would recommend this to anyone making an spr build; just be aware of the things I previously mentioned (Posted on 9/7/2017)
WOW tack driver!! Review by jamie
I got this upper and combined it with a geissele SSA-E trigger.This thing is a TACK DRIVER... You can't go wrong with this upper.. Great Job AERO!!!!!@@ (Posted on 6/5/2017)

3 Item(s)

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