A gun in a dream often symbolizes power you feel you lack, or aggression you've been keeping suppressed rather than expressing directly. Holding the weapon can reflect a wish for more authority over a situation, while having one pointed at you often names a threat you feel unable to confront.
The Sun is in conflict with those who are ruled by Saturn, and Saturn is in conflict with those ruled by the Sun. - Picatrix (Andalusia, ~1000.AD)