Bilson Arms BA15FC 223 Wylde 12.5in Forward Charging Complete Upper Assembly Carbine Length 1-7 Twist 1/2-28 TPI Sniper Green/Grey. 5 inch 4150/4151 CrMoV barrel with FDE & Graphite Black Cerakote Specifications for Bilson Arms BA15FC 223 Wylde 12.5in Forward Charging Complete Upper Assembly: Manufacturer: Bilson Arms Caliber: .223 Wylde Barrel Length: 12.5 in Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Finish: Cerakote Fabric/Material: 6061-T6 Aluminum Features of Bilson Arms BA15FC 223 Wylde 12.5in Forward Charging Complete Upper Assembly Bilson Arms patented forward charging design Package Contents: Bilson Arms BA15FC 223 Wylde 12.5in Forward Charging Complete Upper Assembly Comes in a plastic hard case with a gun lock and owners manual Bilson Arms PAFCS4910R1: BA15FC 223 Wylde 12.5in Forward Charging Complete Upper Assembly Carbine Length 1-7 Twist 1/2-28 TPI Sniper Green/Grey