KSG-1

The KSG-1, or Keats Sound Gun - Mark I, is a weapon manufactured by Keats' Firearms and used by the U.S. Military in 2039.

Origin
After Keats' Firearms'es success with energy weapons, Keats started looking for another unique weapon type. Eventually, he had the idea to use sonic waves. This is his first working weapon to use this technology, and was then approved for use by the U.S. Military.

Effectiveness
It works as a low power Thundergun that fires continuously. It looses usefullness by round 16. It can fire continuously for up to 10 seconds, with a battery that lasts for 3 minutes. Once the battery has run out, the weapon is useless, and cannot be recharged. (unless you get a Max Ammo)