All parts of upper are made in USA and Assembled in house.Upper: Aero AR15 Upper with forward assistBarrel: 18" Ballistic Advantage 223 BarrelBarrel Material: 416R Stainless SteelBarrel Profile: SPRBarrel Twist: 1:8 Twist RateGas Block: .750Gas System: Rifle Length Gas SystemThread: 1/2x28BCG: Black Nitride BCG, Nitride Finish, 9310 Steel Magnetic Particle Inspected(MPI) Bolt, Tool Steel Extractor. (Lifetime Warranty)Handguard: 17" MLOK RailCharging Handle: Ambi Charging Handle
Fits mil-spec AR-15 Lower.
