Big problem!?

[SOLID FITZ]

I was trying to chrono my gun today when air started to leak from inside the gun Im not to sure were iside, then it seemed like I hade the gun on full auto. paintballs were flying out every were but I dident have my finger on the trigger. Also when that happened my tank lost 1000psi . So I took my gun apart to see if I had all the parts and make sure every thing was in place, and put it back together. Screwed in my tank, I can still hear an air leaking sound so I just took the tank out and walked away. Does any one have any Ideas what is wrong and how I can fix it.
Any suggestions would be grreat.

[DRAGON]

Replace the cup seal. Due to escaping pressure it's jackhammering(the full auto thing) You should have gotten an extra cup seal with the repair kit you got with your MR2. It's part #12 in your manual -

[SOLID FITZ]

Thanks, I will replace that today.

[SOLID FITZ]

Ok I replaced the cup seal and I dont hear any air leaks, yet, but it seems to work fine. Thanks alot I can maybe still play on monday.