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Aero Precision – M4E1 Threaded 12.5″ 5.56 Carbine Length Complete Upper Receiver w/ ATLAS R-ONE Handguard


Out of stock




Aero Precision



Aero Precision M4E1 Threaded 12.5″ 5.56

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″ M-LOK ATLAS R-ONE Handguard
    • 12.5″ 5.56 Government Profile CMV Barrel, Carbine Length
    • Low Profile Gas Block and Carbine Length Gas Tube
    • AR15 A2 Birdcage Flash Hider
    • 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

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

12.5″ 5.56 CMV Carbine Length Barrel Features:

    • Chamber: 5.56
    • Length: 12.5″
    • Twist: 1 in 7
    • Threading: 1/2″x28
    • Material: Chrome Moly Vanadium
    • Finish: QPQ corrosion resistant finish both inside and out
    • Gas Block: .750
    • Gas System Length: Carbine
    • Weight: 22oz
    • M4 Barrel Extension
    • HP and MPI Tested

Additional information

Weight 3.5 lbs
Dimensions 23.5 × 4 × 4 in
SKU APAR700704M30


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