LaserGadgets has built some of the most awesome laser toys we have seen in the past. This Steampunky ArmCannon is another one of his creations that sits on your hand and lets you target objects around you. The switch is inside, so you don’t even need to use your other hand to activate this weapon. It does seems a bit heavy considering the materials used to build it:
LaserGadgets has not shared any instructions on how to make one of these. But the above video shows what you can do with such a weapon. You can find out more information about it here.