We all need to remember that calling the police does not mean you are automatically doing something wrong or bad. If there is nothing going on the police will not arrest anyone. On the contrary, calling the police in situations like this can save lives. The police are trained to handle situations like this. Not all of us civilians are, and even if you are carrying a gun you may still not be prepared to handle a situation like this.
I may have to disagree, inserting the police into a situation involving firearms where there is nothing happening has the chance to go very wrong. It may depend on though what the OP told the dispatcher and how that gets relayed to the responding officers.