Choose the WRAITH X configuration for your MTW. The system uses a built-in STORM Category 5 regulator to run an onboard air source. CO2 and HPA The complete CO2/HPA kit supports 12g and 33g CO2 cartridges or a compatible HPA tank. This option does not include the 13ci tank cover. HPA Only Kit The complete HPA-only kit is intended for an onboa