It's a 66 cu ft tank rated to 4500#. The dive shop I got it filled at can only get 4350# ands so far I've gotten 15 fills and the guage reads 4000#. If you've noticed , the hose is very large and looses a lot of air on every fill when you bleed it. I will be getting a shorter microbore hose sometime in the future, to use at home where the setup is easier. I do think the long hose will be very convenient at matches. The gun only has a 60 cc pressure tube, so it doesn't take much to fill it. I have to refill the tank when the guage hits 3300# for optimum shooting efficiency. Gun fills to 232 bar; most other PCP's only fill to 200 bar. Guy I bought the tank from says 60+ fills on an FX Cyclone. I've been refilling every 30 shots or so.
Ric G