This is a model of an arm cannon that I made. This model has available materials for both internal and cycles, the respectful materials have no letter after their name, or a C. It has an action for opening up and loading, I did not put it into an NLA strip. Particle systems used are not for final products and should probably be revised if you wish to use them. I would recommend making better objects for the lightning bolts and fixing the force field for the laser ball.
I hope you guys enjoy this piece of work. :)