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Aero Precision APAR712105M7: This complete upper receiver features the same tried-and-true construction and aesthetics as Aero Precision's M4E1 Threaded Upper Receivers, without provisions for a forward assist. The included ATLAS S-ONE Handguard is designed with size and weight in mind. Featuring a trimmed down top rail to help minimize weight and overall profile. Aero Precision's 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. Note: This complete upper receiver does not include a BCG or Charging Handle. Shop Bolt Carrier Groups HERE and Charging Handles HERE.