The ION has a regulator, it runs at around 160-180PSI.The ION also doesn't have an LPR so any pressure spikes caused by the co2 wouldn't be good. I once froze a wrath to my hand and it wasn't nice, my understanding off it is an ION will only work on air.
what when i first got my 1 it worked around 140 now its running aThe ION has a regulator, it runs at around 160-180PSI.
Regardless, for the price of a HPA tank you may aswell get HPA.