AR15 M4E1 Threaded Assembled Upper ATLAS S-ONE Combo


AR15 M4E1 Threaded Assembled Upper ATLAS S-ONE Combo


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SKU: APPG700201
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AR15 M4E1 Threaded Assembled Upper ATLAS S-ONE Combo

Each ATLAS S-ONE Comb Set Includes

  • AR15 Gen 2 Assembled Upper Receiver
  • ATLAS S-ONE Handguard of choice
  • Handguard Mounting Hardware

ATLAS S-ONE Handguard

The Aero Precision AR15 M4E1 Threaded Assembled Upper ATLAS S-ONE Combo Set is the newest addition to the Aero Precision Handguard lineup. Machined from 6061-T6 Aluminum, the S-ONE line of handguards are designed with size and weight in mind, providing the perfect handguard for 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. Available in KeyMod™ and M-LOK® profiles with 12” and 15” options (7” and 9” options coming soon).


  • Front and rear picatinny rail
  • Eliminated center of top rail for weight reduction
  • Indexing grooves in 12:00 position for positive grip control
  • Compatible with low profile gas blocks
  • 1.3” Inside diameter
  • 1.5” Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels

AR15 M4E1 Threaded Upper Receiver,

The Aero Precision AR15 M4E1 Threaded Assembled Upper Receiver (AKA Gen 2) features a new angular machined design that helps it stand apart from standard mil-spec upper receivers. This upper receiver features the M4E1 enhanced body profile but is threaded to accept a standard AR15 barrel nut. It is forged from 7075-T6 Aluminum, precision machined to work with all mil-spec AR15 parts and includes the port door and forward assist pre-installed. Get the billet look without paying the billet price!

M4E1 Threaded Upper Features:

  • New enhanced forging that gives the upper receiver a “billet look”
  • New picatinny profile that blends seamlessly with our Enhanced Series Handguards

Arm or Ally is proud to team up with Aero to bring you some of the finest AR15 components available at affordable prices. So, be sure to check out our full selection of AR Parts and large inventory of AR Barrels. Product Information Item# APPG700201 Manufacturer: Aero Precision Platform: AR15 – Multi caliber Finish: Anodized Black | FDE MSRP: Starting at $238.48

Additional information

Weight 30 oz
Dimensions 18 x 2.5 x 2.5 in

Aero Precision




Black, FDE


12" M-LOK, 12" KeyMod, 15" M-LOK, 15" KeyMod, 9" M-LOK, 9" KeyMod


Handguard, Upper Receiver Parts


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