That "little thing inside doesnt move where its suppose to shoot the bb" is the air nozzle, if that isnt moving then your SOL until you can a mechbox mechanic. Sounds like your air nozzle broke off of the tappet plate. Or if you feel confident enough, you could look at online guides on how to take apart your mechbox and fix it. If not, Gearbox Airsoft is a good place to get your rifle checked out, they are located on the SE corner of Southern and McClintock. Also, im sure you know better, but if you do go there please have your rifle in a box or bag, all too often i see people waltz in there from the parking lot with their exposed rifle like its no big deal.
