Gun that doesn't run out of bullets

Question

Is there any gun that does not run out of bullets or something like it

Answer 1

I suppose you could recycle the ones used and keep feeding them into it, so it would never run out. However, It would take a lot of energy, so you would eventually run out of energy, which means it is not possible with our current understanding of the universe.

Answer 2

No

Answer 3

none that I now of but that well be very interested to demonstrate !