Bilson Arms BA9FC 9mm 12.5in Forward Charging Complete Upper Assembly Pistol Length 1-10 Twist 1/2-28 TPI Sniper Green/Grey. 5 inch 4150/4151 CrMoV barrel with FDE & Graphite Black Cerakote Specifications for Bilson Arms BA9FC 9mm 12.5in Forward Charging Complete Upper Assembly: Manufacturer: Bilson Arms Caliber: 9mm Luger Barrel Length: 12.5 in Gas System Length: Pistol Length Barrel Twist Rate: 1-10 Threads per Inch: 1/2x28 Finish: Cerakote Fabric/Material: 6061-T6 Aluminum Features of Bilson Arms BA9FC 9mm 12.5in Forward Charging Complete Upper Assembly Bilson Arms patented forward charging design Package Contents: Bilson Arms BA9FC 9mm 12.5in Forward Charging Complete Upper Assembly Comes in a plastic hard case with a gun lock and owners manual Bilson Arms P9UFC4910R1: BA9FC 9mm 12.5in Forward Charging Complete Upper Assembly Pistol Length 1-10 Twist 1/2-28 TPI Sniper Green/Grey