awhile back i received my type-68I tacamo marker. i have used it once in a paintball match and it worked great. the second time i went to paintball, there was a problem with my marker. when i screwed in the co2 tank, air was constantly being leaked out of the barrel and the bolt. i went over the troubleshoot and assumed that it might of been the cup seal being damaged. i stripped the marker and saw no damage to the cup seal. i also oiled the o-rings. when i screwed in the co2 tank once again, air was leaking out of the gun with an even stronger flow than before. anyone know what the problem might be? thanks.