well, considerign that the bul dof the gun (themiddle part) is nothing but a hollow tube/box that serves no purpose (see Zero's gun), you could probably integrate to no end. Let us know how it turns out.
Now, however, you could make an anutomatic ambush sort of thing via hooking up a meotion sensore or light sensor in very light ares between the batty/batteries and the solenoid.