The FSR4BK is a 4-inch, black-finished FS (Farsan/Farsan Airsoft) CO2 BB Revolver. This airsoft gun is designed as a 6mm BB replica, frequently identified by its full metal construction and powered by CO2.  Key Features and Details: Brand: FS (Farsan Airsoft) Model Code: FSR4BK Type: CO2 Airsoft Revolver (6mm BB) Barrel Length: 4 inches Finish: Black (BK) Construction: Full...