So first of all to use the 90gr CO2 tanks in your condor, you will need two adapters. You will need a CO2 adapter for your Condor (usually around $60 used on the Classifieds) and you will need an AirSource adapter. I found this at Pyramyd, but it's no longer available... surely someone has one.
That should have you running at CO2 velocities in your Condor while you wait for a tank or just to use up your CO2.
Now... if you are wanting to regulate your condor for HPA later on, I would suggest that you Google Altaros regulators. He makes a regulator that will fit the AirForce tank. It will add a little length, but will regulate and you can get the number of shots you desire. I have two of his regulators on AF guns and they work great.
If you have any other questions you can hit me on email robertsrc/at/charter/dot/net
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Good judgment comes from experience; experience usually comes from bad judgment.