It's any weapon you want it to be, a fill can, a wand, a wrench, a fill wrench (will explain), a hammer, and a printer! All in one!
This could have a GUI with options for all of these. Let's say you clicked on Hammer. At the bottom of the screen, it would say "Hammer mode". Also, the gun would change color to let you know it's a different tool!
The fill wrench would have a separate GUI. With the fill wrench, there is no need to name each and every brick separately! You can just put in an event/emitter/light/brick name into the GUI, and just hit one brick! All the adjacent bricks will have that event/emitter/light/brick name!
Also, there could be an option for every weapon you have in the GUI! Maybe for the weapons, the gun could change shape!
Discuss.