Cryolator

The cryolator is a weapon in Fallout 4.

Locations

 * Inside Vault 111, in a display case in the Overseers Room behind a master level lock. It cannot be picked up at the beginning of the game due to the lack of bobby pins. Interaction with the case prompts a line from the Sole Survivor, saying he/she will return for it later.

Video on how to get the Cryolator early on!