My friend has a mech. spyder, and the other day we were playin rec ball out in the woods. We'd just finished a game, and he decided to see how fast he could shoot it

. He shot pretty fast, but the bolt suddenly froze up. not like frozen from CO2, it just stopped moving. we disassembled the marker, and a piece of shell was jamming the bolt. Cleaned the whole thing out, put it back together, and gassed it up. When he tried firing it, the marker made a "burping" sound, like when a marker's low on air. except this was much more forceful. We tried his tank on a friend's gun, and the tank was fine. He can't get his marker to work again, so does anybody know what could be wrong with it? I'm thinking some kind of seal was messed up, but I don't have a spyder, so I don't know much about them. Any help would be greatly appreciated! He can't play anymore 'till his gun is fixed...