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.

Specifications for Aero Precision Complete Upper Receiver M4E1-T, 5.56 NATO w/ R-One Handguard:

Features of Aero Precision Complete Upper Receiver M4E1-T, 5.56 NATO w/ R-One Handguard

• 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
• 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

Package Contents:

• Aero Precision Complete Upper Receiver M4E1-T, 5.56 NATO w/ R-One Handguard
• 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