The Px4 Storm is a versatile bb & pellet shooter with real blowback action. The power is in your hands! (Co2 cartridge not included) the px4 storm looks, feels and shoots just like the firearm it copies. Like the handgun, it has real blowback action (cocking the gun with each slide action), giving you a feeling of power that most air guns only hope to achieve! Once you start shooting, you won't want to stop, so get lots of ammo and CO2 cartridges!