Streamlight Switch Assembly for Scorpion/Scorpion LED/Stinger XT Flashlights 850018 replaces the tailcap power switch on Streamlight Scorpion and Stinger XT Flashlights. In order to replace the power switch of a Streamlight Scorpion, Streamlight Scorpion LED, or Streamlight Stinger XT Flashlight, this Streamlight Switch Assembly is the right part.