Aero Precision M4E1 5.56mm Assembled Upper Receiver Atlas R-One Handguard

This assembled upper includes Aero Precision's 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 attachments. Their ATLAS attachment system is a durable mounting platform, maintaining a slim profile with strength and stability. INCLUDES M4E1 Threaded Upper Receiver — Anodized Black or Cerakote FDE depending on model; 15 inch ATLAS R-ONE M-LOK Handguard with 16 inch CMV Barrel OR 15 inch ATLAS R-ONE M-LOK Handguard 18 inch Rifle Length CMV Barrel OR 10 inch ATLAS R-ONE M-LOK Handguard 10.5 inch Carbine Length M4 Barrel. Low Profile Gas Block and Mid Pencil, Mid-Length, or Rifle Length Gas Tube depending on configuration. Product comes assembled. This assembled upper does not include BCG or Charging Handle. The muzzle brake included is not pinned or welded to achieve the 16 inch rifle length per ATF.