pEpSi DuDe

Ok so I have been out of paintball for about 9 months now. Old friend tells me he is going paintballing Sunday. So then I go to get my gear and guns ready for tomorrow. I take both of my guns to the nearest store I always used to go to. I screw in my compressed air tank to see if my BKO works and it fires once and then uncocks. The guy at the store said it had something to do with the 'timing'... not exactly sure what that is? After the first shot the gun jsut makes a small noise every time you pull the triger. Is there a quick fix for this or do I need to send it to Indian Creek Des. so they can fix it for me at the factory? Would love some suggestions so I can use it tomorrow or I will have to use my old Piranha... if that works...

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GEAR
04 BKO (black) (CP flame drop) (Dye Sticky Grip)
68ci/3000psi ACI Bulldog HPA tank
Halo B (black)
Clear Dye Invision goggles
Proto 3 pod pack
PMI Piranha Full Finger Gloves
JT Premiere 04 Jersey (red)
Proto pants
JT SUV medium gear bag