if the gun work, and what kind of air tank are you talking about? if it is a 45/3000, you may as well use that money toward one of the newer freestyle instead of an 04 freestyle.
AB Freestyle with HR1+STD lpr +Sidwinder+maxflow+empire b+JJ edge+Function Uni
Blue B2k4W/PDS+Chaos+CP reg- Ebay Valve + Halo B+J&J Edge Kit.+ CCM No Rise
1 automag classic, 2 zeus g1, 1 zeus g2, 1 ariakon overlord
ICD Thunder cat dual tank