Mechanic's Best Friend

 is a unique weapon in Fallout 76.

Characteristics
A special legendary weapon received for completing Survival challenges. As expected, it's very powerful, with guaranteed multiple legendary effects. As expected, it's only available in Survival mode.

Locations
Destroy Different Kinds of Robots
 * The player simply has to destroy an Assaultron, Protectron, sentry bot, and a Mr Handy or Mr Gutsy (one each). Watoga provides Assaultrons, Protectrons, and Handies aplenty (especially after completing the quest that makes them ignore the player), while sentry bots are a little harder to track down: They can be found at the Whitespring, in The Whitespring Bunker (for those seeking a challenge), and spawn during Event: Battle Bot.