Brownells 75th Anniversary - A Shooting Heritage
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This complete upper includes our new ATLAS R-ONE Handguard! The R-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.

Includes:

  • M4E1 Threaded Assembled Upper Receiver
  • ATLAS R-ONE Handguard of choice
  • 11.5" 5.56 CMV Barrel, Carbine Length
  • Low Profile Gas Block and Carbine 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:
  • 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:

  • 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

Learn More about our NEW ATLAS S-ONE Hanguards 11.5" 5.56

Barrel Features:

  • 5.56 Nato 11.5" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • Government Profile
  • .750 gas block journal
  • Carbine length gas system, .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider

AERO PRECISION - M4E1-T ATLAS R-ONE COMPLETE UPPER RECEIVERS 11.5" 5.56MM

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2 Item(s)

Alert Me When Available

This item is currently unavailable for backorder.

Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: M4

Length: 11.5"

Alert Me When Available

This item is currently unavailable for backorder.

Cartridge: 5.56 mm NATO

Finish: Flat Dark Earth

Style: Complete

Contour: M4

Length: 11.5"