Infinite Energy Series Capacitor (IESC)

There are a plethora of factual forms of free energy. Lets wet your appetite with those first.

Lasers produce more light energy than is input into them. This is called optical amplification but is more dramatically stated as free light energy from out of nowhere.

Fusion energy is one of the holly grails of energy technology but hasn't yet been perfected. Look to the national ignition facility for more about the super laser that creates fusion level energy, which means that we may soon achieve cold fusion. This is good and bad because yes we will have infinite energy but we'll still have to pay the government for the energy indefinitely, and they will always have control over us. So a solution would be some kind of personal sized free energy device, like Mr. Fusion on back to the future, at least I wish.

But wait there's more!

Electro-static induction is so simple yet so misunderstood, it should really be called free electrical energy from the gods, because they like us so much. Place one charged object next to one uncharged object, then make the uncharged object grounded, and what do you have? In an absolutely perfect scenario, with no energy disipation, and absolute closest and highest induction, you will end up with twice as much energy as you started with. Simple right? Well to put it into practice we are almost there, but not quite. When they come out with the EEStor ultra-capacitor we will then have this theory that we can put into practice. If you were able to charge half of the plates, then ground the other half, you would have almost perfect induction, because the plates of an ultra-capacitor are the closest and highest voltage materially possible. But in order to have no energy dissipation you would need to charge then induce then store all of that energy instantly for the least energy loss. But the capacitor may keep enough of the energy for it not to matter that much. So just have a mono-charge generator(van de graaf)then charge one plate and now ground the other plate and you have more energy than you started with.
The perfect one of these would be a long string of plates. As the first plate got charged, and all of the rest of the plates are grounded, then you would induce a charge into the plate next to it, and then induce another charge into the next adjoining plate, and so on, until every plate in the series is charged, then release all of the energy at once.(Because of the electrical attraction you would need to release them all simultaneously). And it's DC energy too, Thomas Edison would be proud.
I call it the "Infinite energy series capacitor".

This would be perfect for a ray gun because the electrical energy could then be put into a laser and now you have star trek powered guns with no need for bullets. And of course you'd have the all important waiting for it to charge buzzing sounds and the blinking red light when ready. Free bullets or free energy, it's all good!
P.S. You may be able to jury rig an EESU if you could tap into each individual plate separately.