I am not going to be a dick (Age verify) and give the most basic things for you to check.
Assuming that the gun SUDDENLY stopped working, there was no minor or major rough handling of any kind, they I suggest to get yourself a multimeter and check the wiring.
Check the engine, see if it gets power or not.
If the battery is a lipo 11v without a mosfet unit, then the gearbox needs to be opened. beyond this, for a novice with no time, the best luck you have is to take it to a local shop for diagnostic.
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