Aero Precision M4E1 Threaded Assembled Upper Receiver and ATLAS S-ONE M-LOK HG Combo - Anodized

SKU# 2531 | by Aero Precision
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The M4E1 Threaded Upper/ATLAS S-ONE Combo Set Includes:

  • M4E1 Threaded Assembled Upper Receiver
  • ATLAS S-ONE Handguard of choice
  • Handguard Mounting Hardware

ATLAS S-ONE Handguard:

The ATLAS S-ONE 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 M-LOK profiles with 7", 9" 12" and 15"


  • 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

M4E1 Threaded Assembled Upper Receiver:

The M4E1 Threaded Assembled Upper Receiver features a new angular machined design that helps it'stand apart from standard mil-spec upper receivers. This upper receiver features the same enhanced body profile as our M4E1 Enhanced Upper Receiver 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
  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Includes port door and forward assist installed


  • Made In AMERICA: Yes
  • Platform: AR-15
  • Weight: M-LOK: 7" - 16.48 oz / 9" - 17.09 oz / 12" - 18.62 oz / 15" - 19.57 oz
  • Other: Note: Weights above include Gen 2 Upper, Handguard and Mounting Hardware.

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