The Wave Gun is a Wonder Weapon that is featured in the Zombie level Moon. It causes zombies to expel blood out of their mouths, slowly expand while floating away, and then explode into a bloody mist. It can also be taken apart and Dual Wielded, in which it becomes the Zap Gun Dual Wield, which fires bolts of electricity similar to the WunderWaffe. However, this shot only kills (instantly) one zombie.
When Pack-a-Punched, the Dual Wielded version becomes Porter's X2 Zap Gun, and the combined version becomes the Max Wave Gun.
The Wave Gun can be obtained in the Mystery Box or from a QED drop. When first equipped, the gun is found in Dual Wield mode. It fires a red ball of electricity that kills zombies similarly to the Wunderwaffe DG-2 upon contact. It only kills the zombie it hits, and no others are affected. The Zap Gun Dual Wield will always be a one-shot kill to any zombies at any range. After hitting Left on the D-Pad, the gun combines to become one weapon, which fires a purple beam that causes zombies in its blast radius to expand and explode. The Pack-a-Punched version causes the zombies to perform an extra animation before expanding, and has increased ammo capacity and reserve ammo. This weapon is very useful at higher rounds due to its large magazines and the capacity to change fire mode instantly.
The Pack-a-Punched versions of the Wave Gun (Max Wave Gun and Porter's X2 Zap Gun) are a reference to Treyarch's game designer Max Porter, who designed the original Ray Gun in World at War.
Zombies killed by either form will not drop power-ups.
The Wave Gun says "87" on the side, similar to the V-R11.
A Wave Gun model was created and was featured in a video previewing Moon.
When Dual Wielded (Zap Gun Dual Wield) the crosshairs expand while rotating. It shares this trait with the Ray Gun, the Winter's Howl and the 31-79 JGb215.