Gearbox locking up...

My gearbox will make one resolution then it will "lock up" with the piston all the way in the back and it will not move. I can feel the motor moving but nothing is happening...my bat is fully charged and gearbox is shimmed right everthing looks to be in its place. And to add I did get a g&p piston and piston head for my gun because the stock piston was showing wear n'tear on it....any help would be great...Also IF i get my gun fixed ill be at the OP at GeorgeTown tomorrow so i kinda help help fast.

if your motor is spinning and nothing else is moving something is stripped.

He probably means that he can feel the motor shuttering, like it wants to turn but cant. A problem like this can mean many different thing. The piston could be too big for the gearbox in width, this has happened to me and rhino on multiple guns. It could be improperly shimmed, the motor, many things, your best betis to take it to airdog and let them open it up for ya.

thanks guys for the tips and pointers!!