The Jernas Missile Turret is a turret capable of holding up to 8 small to medium sized missiles. To use it, you must select the mounted missile you wish to fire from the Weapon Manager menu rather than the turret itself.
The Jernas Missile Turret has a built-in detection and tracking radar, making it highly autonomous, and capable of locking on to and engaging targets that move within its range automatically.
The turret is incapable of having parts surface mounted onto it, and although technically possible, it is highly inadvisable to mount anything but missiles to the turret's nodes.