Aero Precision M4E1 14.5″ 5.56 Complete Upper Receiver w/ ATLAS R-ONE Handguard

This complete upper includes Aero’s new 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. Aero’s 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
• 14.5″ 5.56 Mid-Length CMV Barrel
• Low Profile Gas Block and Mid Length Gas Tube
• Product comes assembled
• This complete upper does not include BCG or Charging Handle.
• 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:

• 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
• Learn More about our NEW ATLAS Handguards

14.5″ 5.56 Mid-Length Barrel Features:

• Chamber: 5.56
• Length: 14.5″
• 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 Port: .0785
• Gas System Length: Mid
• Weight: 26oz
• M4 Barrel Extension
• HP and MPI Tested