M4E1 Threaded 16" 5.56 Mid-Length No Forward Assist Complete Upper Receiver w/ 15" M-LOK ATLAS R-ONE Handguard

This complete upper includes the 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. The 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.

The Complete Upper Includes:

• M4E1 Threaded Assembled Upper Receiver, No Forward Assist
• 15" ATLAS R-ONE Handguard of choice
• 16" 5.56 CMV Barrel, Mid-Length Gas System
• Low Profile Gas Block and Mid-Length Gas Tube
• A2 Flash Hider
• Product comes assembled
• This complete upper does not include BCG or Charging Handle.

M4E1 Threaded, No Forward Assist Upper Receiver Features:

• No Forward Assist
• New enhanced forging that gives the upper receiver a "billet look"
• New picatinny profile that blends seamlessly with the Enhanced and Atlas 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

16" 5.56 CMV Barrels

• Chamber: 5.56
• Length: 16"
• Twist: 1 in 7
• Threading: 1/2"x28
• Material: 4150 Chrome Moly Vanadium
• Finish: QPQ corrosion resistant finish both inside and out
• Gas Block: .750
• Gas Port: .0785
• M4 Barrel Extension
• HP and MPI Tested