- M4E1 Threaded Assembled Upper Receiver
- 12.7″ ATLAS R-ONE Handguard of choice
- 13.9″ 5.56 Mid-Length CMV Barrel
- Low Profile Gas Block and Pistol Length Gas Tube
- Product comes assembled
- This complete upper does not include BCG or Charging Handle
The AERO PRECISION M4E1-T 13.9in 5.56mm Threaded Complete Upper Receiver 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. Their 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.
