instead of buying a rile, or a pistol which is only going to lead into a armed confrontation where someone gets maimed or killed, spend the money on a camera and an intercom, don't even answer the door, monitor the camera, use the intercom to ask their business, if they have legitimate business and have portfolio's etc make them show them to the camera before you open the door, likewise if they're carrying a bag, or long coat make sure they show you the contents.
Have your camera installed so you can see a wide field, you do not want someone hiding behind another, or stood at the side of the camera, might not be a bad idea to have a registration book, with dates in, make visitors sign in etc, or have "By appointment only" on your door.
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