Aero Precision – M4E1 Threaded 11.5″ 5.56 Barrel Complete Upper Receiver w/ 9″ M-LOK ATLAS S-ONE Handguard – FDE Cerakote

We're known for two things at Aero Precision: outstanding engineering and machining, and the capacity to get customers what they need, whenever they need it. Representatives of the military and law enforcement communities across the country have recognized our products for one simple reason: they work a lot better.