To dream about a gun - to failures. If dreamed you that you have a gun, then you should be careful of emergence of low lines in your character. If in a dream someone tells you a story in which the gun appears, then you are fated to learn about the artful plans directed against your interests. To shoot in a dream with the gun means that you will make much to revenge for the estimated evil.
Be sure and keep any other thoughts out of your mind before drifting to sleep as a cluttered mind can decrease the chances that you will remember your dreams upon waking. Also, focusing on remembering your dreams upon waking in the morning is another very important thing. This sounds very easy, but is often hard for some to do. Interpret a dream by "dictionary dream of interpretation"
When you very first wake up, simply think about your dreams. Don't allow your mind to drift off to other things, just lay there and think about the things you dreamt about the night before - dictionary dream meaning.