The Engi gun
The Engi Gun is an engineer pretending to be a sentry gun. They are not friendlies, but none the less are a very rare sight. Like sentries they look left to right until they spot a target and then attack using their secondary (they won't attack disguised spies and kill themself if they get sapped).
They can pose a threat, especially if an Engi Gun catches another player who is distracted. They may also be near dispensers for healing and ammo,
Loadout[]
Primary: Any
Secondary: A pistol
Melee: Any
They wear the Brian Interface and the Sightliner.
Trivia[]
A youtuber named Samwiz1 made a video where he was an Engi gun.