CM Sonic Drill

The CM Sonic Drill is a "secret gun" that was found in the files of. There is an extremely high chance that this weapon will never be released in-game, as this gun's schematics have already been used. It does, however, have the potential of being a released gun since it has a Black version image, but no one is certain. Additionally, the Drill and its /Black versions are mentioned in a file in the mobile version's game file, and the gun itself appears in a file containing Critical Mass weapons. Further, images for the top-down view of the gun (which would be seen when the player is holding the weapon during gameplay) exist in the file for the normal and version.

Judging by its name and appearance, it would have use sonic blasts to reduce zombies to protoplasm.

Trivia
The Template-DONT-SPAWN has the in game appearance of the Sonic Drill.

Apparently, the Sonic Drill will never be released in-game, because it has already mutated into another gun that has just been released with the same schematics: The CM Laser Drill.