[mcguyver]

Where did you buy it? If they are an honourable retailer, I'm sure they will do what is right to try to make you happy. That being said, used, upgraded guns can have issues due to the installation quality put into the upgrades. Parts are only as good as the guy installing them. Stock parts done well can have long and productive lives and expensive FTK's can be ruined by a hack.

But this is true for anything, from AEG's to cars.

If this is your first gun, maybe stock should be your goal. Complex and detailed upgrades can lead to problems that will need to be addressed and you'd hate to have learn about AEG's by constantly having to work on it. It would be so much simpler and enjoyable to just play with it and not fix it.

But then again, there may be nothing at all wrong with your gun and you just may not have the correct battery for it. It could be that simple.