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Wiremod Auto-Shooter

numpad 5 to switch targets. A PewPew gun is also pre-duped; press numpad 0 to shoot.

I found this in my old (2 years) dupes, so I edited it and put it to "good use." You can mount it anywhere regardless of angle or position, and it will still aim correctly. This is useful for ceiling and wall turrets as well as AA guns. While upright, it has a minimum vertical angle of about -5 degrees.