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.
Planets under the Sun's beams, or within twelve degrees thereof, are unfortunate, unless in the same degree with him, but when passed 12 degrees from him (existentes orientales) they are fortunate. - William Lilly (1602.-1681.)