Personally i like having my scuba tank. Its a 3500 PSI steel tank with a DIN reg. I bought it used for $110. Then I needed to buy the fill station which was a real pain($100). I know this is not why you are doing it but I like to have spare air for who ever needs it when I play. The way I figure it I pay ~ $8 to fill the tank or $6 to fill my HPA tank. I play with several people who dont have thier own equipment and I am trying to grow paintball in my area. So I will give the air away when my fill station arrives! Out of curiousity is the fire station a DIN hook up?? If so I bought my DIN to PB adapter from scuba.com. I thought it was a whip that you could hook directly up.

Barron,
I'm all for sharing but, one SCUBA tank only really works for one person. By the end of the day, depending on the amount of shots I take, I usually have to switch to CO2. That's why its nice to have a couple people with tanks. Both service off one tank until its too low then switch tanks. Seems to last loger that way.

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