The Zapper (AKA Plasma Cannon) comes in three forms:
The Grav Zapper Shoots balls of plasma (deadly, but movable with The Hand.) These balls have gravity, and fall to the ground
The Zero G Zapper shoots balls with no gravity, but has all other qualities the same as the Grav Zapper
The Pivot Zapper's balls have no gravity, and moves on a pivot when in play.