Aero Precision AR-15 .300 Blackout M4E1 Threaded Complete Upper Receiver, 8″ Barrel, Atlas R-One M-LOK 7.3″ Handguard- FDE Cerakote

This complete upper includes our 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. 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.

Complete Upper Includes:

• M4E1 Threaded Assembled Upper Receiver
• ATLAS R-ONE Handguard of choice
• 8″ .300 Blackout CMV Barrell
• Low Profile Gas Block and Pistol 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 Feed ramps
• .250 takedown pin holes
• Laser engraved T-marks
• Includes port door and forward assist installed

Atlas R-One Handguard:

• 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

8″ .300 Blackout Barrel Features:

• Length: 8″
• Twist: 1 in 7
• Muzzle: 5/8×24 Threaded
• Material: 4150 Crome Moly Vanadium
• Finish: QPQ corrosion resistant finish both inside and out
• Gas Block: .750
• Gas Port: .109
• Gas System Length: Pistol
• Weight: 18oz
• M4 Barrel Extension
• HP and MPI Tested