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

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.

Includes:

• • 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