Bilson Arms BA9FC 9mm Luger PCC 16in Forward Charging Complete Upper Assembly Standard Carbine Length 1-10 Twist 1/2x28 Nitride Tactical Grey/Graphite. Pistol caliber carbine (pcc) pump style forward charging complete upper assembly Specifications for Bilson Arms BA-15FC 16 inch Pistol Caliber Carbine Style Forward Charging Upper Assembly: Manufacturer: Bilson Arms Caliber: 9mm Luger Barrel Length: 16 in Barrel Profile: Standard Gas System Length: Carbine Length Barrel Twist Rate: 1-10 Threads per Inch: 1/2x28 Condition: New Fabric/Material: 6061-T6 Aluminum Gun Rail: Picatinny Barrel Material: 4140 Chrome Moly Vanadium Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Magazine Included: No Mount Type: M-LOK Features of Bilson Arms 556cl-ua 16 inch Pump Style Forward Charging Upper Assembly Manuf in-house More efficient & ergonomic charging patent pending pump style forward charging action billet aluminum Cerakote finish Package Contents: Bilson Arms 556cl-ua 16 inch Pump Style Forward Charging Upper Assembly Steel Nitride Bcg Bilson Arms A9UFCTB10R1: BA9FC 9mm Luger PCC 16in Forward Charging Complete Upper Assembly Standard Carbine Length 1-10 Twist 1/2x28 Nitride Tactical Grey/Graphite Black