M4E1 Threaded 16" .223 Wylde Complete Upper Receiver w/ ATLAS S-ONE Handguard

Aero Precision AR15 Gen 2 Complete Upper, 16" .223 Wylde Mid-Length Barrel, ATLAS S-ONE Handguard

M4E1 Threaded 16" .223 Wylde Complete Upper Receiver w/ ATLAS S-ONE Handguard Product Sku: APPG700214

This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Our proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.


  • M4E1 Threaded Assembled Upper Receiver
  • ATLAS S-ONE Handguard of choice
  • 16" .223 Wylde Mid-Length Stainless Steel Barrel
  • Low Profile Gas Block and Mid-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 Threaded Upper Receiver Features:

  • New enhanced forging that gives the upper receiver a "billet look"
  • New picatinny profile that blends seamlessly with our Enhanced Series Handguards
  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Includes port door and forward assist installed

ATLAS S-ONE Handguard Features:

  • Front and rear picatinny rail
  • Eliminated center of top rail for weight reduction
  • Indexing grooves in 12:00 position for positive grip control
  • Quick disconnect sling socket at the 3, 6 and 9 o’clock positions
  • Compatible with low profile gas blocks
  • 1.3” Inside diameter
  • 1.5” Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels
  • Learn More about our NEW ATLAS S-ONE Hanguards

16" .223 Stainless Steel Mid-Length Barrel Features:

  • .223 Wylde 16" Mid-Length Barrel, 1/8 Twist
  • 416R Stainless Steel
  • Bead Blasted Finish
  • .750 gas block journal
  • Mid-length gas system
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider
Made In America? Yes
Platform AR15
Series ATLAS
Caliber .223 Wylde
Barrel Length 16"
Weight(s) 12" - 51 oz / 15" - 52.6 oz
Other NOTE: Weights above include Gen 2 Upper, Handguard, Barrel, Muzzle Brake and Mounting Hardware.

Customer Reviews

4 Item(s)

A Strong upper for your AR Review by Stephen
As I carry a M4 in law enforcement capabilitys. Also working security on the side I decided I wanted a rifle to have along with my side arm and went with this upper because of the new Atlas Build. I have to say its very lightweight but strong and makes the best use of space and weight management. I cant wait to head to the range and put this through the test! (Posted on 5/17/2018)
Awesome right out of the box Review by Ryan
When I received my upper (16” barrel with 15” M-LOK handguard) I was impressed by the quality and the weight. I took it to the range yesterday and I was amazed by its accuracy. (Posted on 4/25/2018)
Awesome Upper Review by BobS
Just took this to the range, with my new red dot, dialed it in, and it had no issues with the 400 rounds through it. Finish was great, tight fitting to my lower, and I was able to sling it around easier than my old upper (weight difference). (Posted on 11/20/2017)
Excellent product, and buying experience Review by Kevin M
Was looking for a quality complete upper for a while, and wanted to buy an Aero, but the "old" handguards were a bit too big for me. Excited about the new Atlas-S, I pulled the trigger on this one. It arrived today, within 6 days of ordering. I am impressed with the fit, and finish of this upper, and cant wait to shoot. Don't think you could buy a better complete upper, for twice the price. (Posted on 8/30/2017)

4 Item(s)

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