M4E1 18" .223 Wylde Quantum Handguard Complete Upper Receiver

Aero Precision 18" .223 Wylde Quantum Handguard Complete Uppers

M4E1 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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