American Made Parts for American Rifle Builders

Aero Precision

Aero Precision M4E1 Threaded Complete Upper, 14.5" 5.56 Mid-Length Barrel w/ Pinned Gamma 556SL Brake, 12" M-LOK ATLAS R-ONE Handguard - Anodized Black

Retail: $539.99
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This complete upper includes our ATLAS R-ONE Handguard. The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. 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
  • 12" ATLAS R-ONE M-LOK Handguard
  • 14.5" 5.56 Mid-Length CMV Barrel with Pinned and Welded VG6 Gamma 556 SL Brake (16" OAL)
  • Low Profile Gas Block and Mid-Length Gas Tube
  • Product comes assembled
  • This complete upper does not include BCG or Charging Handle.

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 R-ONE Handguard Features:

  • Full top picatinny rail for optional attachments
  • 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

14.5" 5.56 Mid-Length Barrel Features:

  • Chamber: 5.56 NATO
  • Length: 14.5" (16" OAL w/ Pinned Brake)
  • Pinned Brake: VG6 Precision Gamma 556 SL
  • Gas System Length: Mid-length
  • Twist: 1/7 twist
  • Material: 4150 CrMoV
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas Block: .750
  • Gas Port: .0785
  • M4 Feed Ramp Barrel Extension
  • HP and MPI tested

Made in America!