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. This complete upper does not include a BCG or Charging Handle.Features:M5 Assembled Upper ReceiverATLAS R-ONE Handguard of choice20" .308 CMV Barrel, Rifle LengthLow Profile Gas Block and Rifle Length Gas TubeProduct comes assembledCaliber/Gauge .308 WinBarrel Length 20"Barrel Twist 1:10Barrel Bore Type RifledBarrel Finish QPQ Corrosion ResistantBarrel Fluting NoneBarrel Profile Mid WeightFirearm Fit AR-10Threaded Barrel YesCondition New