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. – INCLUDES – M5 Assembled Upper Receiver – ATLAS R-ONE Handguard of choice – 16 .308 CMV Barrel Mid-Length – Low Profile Gas Block and Mid-Length Gas Tube – Product comes assembled – This complete upper does not include a BCG or Charging Handle