a laser weapon of some kind
Light laser (pistol) 1 crystal for the beam color, 4 aluminum bars, 2 copper bars, and a low power capacitor
Medium laser (rifle) 1 crystal, 1 diamond, 4 steel bars, 3 copper bars, and a medium level capacitor
Heavy laser (rifle) 2 crystals (must be same color) , 2 diamonds, 5 titanium bars, 4 gold bars, 2 copper bars, and 2 medium capacitors
ultra laser (3 barreled gatling laser.) 6 crystals, 7 diamonds, 20 titanium, 8 gold bars, 3 Endurium bars, and 6 high power capacitors
Possibly power cells or they would drain your energy, but would still have to vent heat. A person inside a power zone could hypothetically with enough solar panels could fire indefinitely if not for heat levels and high weapon power drain.
I would think that all of these ideas are good ones. But, if you wish to get them added you would need to get gristmill to accept the ideas.