I had a dream that I was shooting a gun; can someone interpret?

You are right dreams do have meanings,not all dreams but most dreams do. Your dream has a message for you. When you dream of guns they have many different meanings its all in how the gun was used and how the gun was handled. Its a message meaning the end of your worries and the start of a new era in your life. And if it was so vivid then you should know that your new life is going to be bigger then your old.