This is a Crosman CO2 Pistol known as the Vigilante chambered in 177PEL, model CCP8B2.
The Vigilante is a double action revolver that shoots pellets and BBs. Included is a 10-shot pellet clip and a 6-shot BB clip. It's powered by CO2 and shoots pellets up to 435 fps and BBs up to 465 fps through a 6-inch rifled steel barrel.
Features:
Fixed blade front sight
Adjustable rear sight
Shoots pellets and BBs