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Aero Precision 18" Fluted M4E1 Upper .223/5.56 Wylde Rifle Atlas S-One AR15 AR-15 Sniper
Aero Precision 18' Fluted M4E1 Upper .223/5.56 Wylde Rifle Atlas S-One AR15 AR-15 Sniper

Aero Precision 18" Fluted M4E1 Upper .223/5.56 Wylde Rifle Atlas S-One AR15 AR-15 Sniper

Part Number:APAR700305M51
On sale: $601.71
Retail Price:$729.99
You Save:$128.28(18%)
In Stock.

Choose Options

Add Milspec Charging Handle [+$12.95]
Add Aero Ambi Charging Handle [+$74.95]
Add US Made Nitrided M16 BCG [+$99.95]
Add Aero Phosphated M16 BCG [+$129.95]
Add Aero Precision 5.56 Nickel Boron BCG [+$174.95]
Aero Precision 18" Fluted M4E1 Upper .223/5.56 Wylde Rifle Atlas S-One AR15 AR-15 Sniper Series


The Aero Precision AR-15 barreled upper receiver is built around the M4E1 Threaded upper receiver designed for use with standard barrel nuts. The receiver is forged from 7075-T6 aluminum and precision machined to M4E1 specs to ensure proper fit with Mil-Spec and aftermarket parts. It is matte black hardcoat anodized and features laser engraved T-marks on the upper picatinny rail. This 18” .223 Wylde barreled upper comes with the Atlas S-One M-LOK free float handguard that features improved ergonomics, and a lightweight design with scalloped picatinny top rail. It also features a slim 1.3" internal diameter with indexing grooves for a comfortable grip.


  • M4E1 Assembled Upper Receiver with Forward Assist
  • 15" M-LOK ATLAS S-ONE Handguard with Continuous Monolithic Top Rail
  • 18” .223 Wylde barrel
  • 416R stainless steel fluted barrel
  • HPT and MPI
  • Bead blasted finish
  • 1:8 twist rate
  • Rifle length gas system
  • Low Profile Gas Block and Rifle 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
  • The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel.

M4E1 Threaded Upper Receiver Features:

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

ATLAS S-ONE Handguard Features:

  • Lightweight picatinny rail for sights and optics
  • 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

Barrel Features:

The .223 Wylde 18” barrel is machined from 416R stainless steel steel with a bead blasted finish, a rifle length gas system, and a 1:8 twist rate. It has an M4 feed ramp barrel extension and is magnetic particle inspected as well as high pressure tested. A standard A2 flash hider with 1/2x28 threading is attached to the muzzle.

Aero Precision takes some of the most state-of-the-art manufacturing techniques and equipment derived from their work in the aerospace industry and applies it to their products in the firearms industry. They have utilized their knowledge from years of building aircraft components to design and engineer AR-15 handguards, receiver sets, scope mounts, and more. They treat every product as if it were a precision flying machine and adhere to strict quality standards to ensure law enforcement, military, and civilian customers receive a product they can rely on.

Shipping to FFL Dealer RequiredNo
Made In America?Yes
SeriesATLAS S-One
Caliber.223/5.56 Wylde (can use either ammunition with improved accuracy)
Barrel Length18"
FinishAnodized Black
Weight(s)2 lbs 7 oz

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