Does anyone use the higher pressure SCUBA tanks? I was looking around and the highest I saw for service pressure was 4400psi and the tank was like 369$ and anything over 3000psi required some sort of DIN valve on it.
They actually make 5000psi High pressure breathing air compressors to fill HPA paintball tanks...like 3k....
http://www.americanairworks.com/paintball.html
like 3400$, doesn't say what PSI it fills too...kinda pricey...I would imagine if you have alot of friends you play with recreationally though it could pay itself off in a year or so.