Aero APAR620708M84: This EPC-9 Complete Upper Receiver comes standard with an 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. The Aero 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 handguards.This upper does not include the BCG or charging handle. The upper does feature a bolt hold-open mechanism after the last round is fired and follows a standard AR15 takedown pin pattern. The twist is 1:10 and the A2 flash hider screws onto the 1/2-28 threaded chrome moly vanadium barrel that has a QPQ corrosion-resistant finish.
