Gun turret

The gun turret is equipped with twin plasma cannons and is heavily armored.

Fallout 2
They can be found at the Navarro base just like the auto-cannon. The gun turrets are part of an automated defense system.

Fallout Tactics
In Fallout Tactics, gun turrets can be found guarding the second generator during the Jefferson mission and in the building Albert Lamore is hiding in during the Newton mission.