Wolverine Airsoft shows how to install their new Wraith X AEG for use with HPA... "Everything is included in the box to run your choice of 12g CO2 or 33g CO2 inside the milspec buffer tube or a standard HPA tank. WRAITH X includes all the advantages of the STORM Category 5 regulator which provides faster and more consistent pressure even in the most demanding of applications, from high refresh rate and low pressure SMGs all the way to high pressure precision required for advanced snipers. Want HPA performance without a line but not sure which air source to choose? Don’t choose…get it all with the WRAITH X."