Defend Your Base!
Download these three turrets from our incredibly popular Tower Defense flow and use them in your own game. They're not limited to Tower Defense games but can be a fun addition to any game including adventure and FPS games.
Instructions
Download the zip file which will contain a single Unity package. Drag that into your project panel to import them. Open up the test scene included to see how they work. All that is required to get them to fire at an object is to utilize a tag of Enemy (case sensitive) and they must have a Rigidbody/Collider applied in order to enter the triggers of each weapon.
Related Training
You can learn all the details of how these turrets operate from the Developing a Tower Defense Game course.