ok..lol that question..
anyway..there is a few things
1. AEG is eletric..don't need gas
2. Green Gas mag to hold gas
3. CO2 Mag to hold gas
4. HPA Tank to hold gas
2 needs green gas or propane+silicon tank
3 just replace the 12gram co2
4 needs a HPA tank, if you find your gun has a nozzel for air..it's probably a HPA
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