Gun 
To dream of a gun represents hostility, wrath, and possible hazards. Perhaps you are having difficulties expressing your positive and negative emotions. A gun can also be a symbol of male genitalia and masculine intensity. Therefore, it can represent intensity or incapacity.
To dream that you are loading a gun suggests that you should use caution when expressing your anger or hostility. Don't allow these emotions to go unchecked.
To dream that you shoot someone with a gun implies that you harbor hostility for someone.
To dream that someone is shooting you with a gun denotes a difficult issue that you are facing. An issue may be making you feel vulnerable and exposed.
*Refer to Pistol or Shot.
Killing
To dream that you kill someone portends your overwhelming tension which may cause you to blow your top as you are likely to lose temper and self-control. Check your emotions and assess if you are harboring rage or bad feelings towards the person you killed in your dream. Your dream may be an actual projection of enormous anger or hatred towards that person. On the other hand, you might be merely seeing yourself in the person you killed. You may be wishing to end the traits that this person represents within you. Is it dawning on you that you might end up as an equally scornful person?
To dream that you have been killed symbolizes a certain level of inconsistency between your actions and your emotions. Alternatively, your dream may be pointing to sudden major changes happening in your waking life.
Your dream may also represent a part of you or your life that you have ignored has been resulting to a number of annoying incidents. The act of killing may be a dramatization for killing these negative and embarrassing traits and habits.
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