Get a system that sounds a loud horn and calls the law. It's by the front door (and also in other parts of the house). Answer through the door, looking through the peep hole and/or side window. If they are sketchy and don't go away, play the Defcon 1 button press.
No need to keep discussing going outside as a bad idea. You may think you have the drop on someone, until you are yakking your spiel and they just shoot you. In my FOG FOF experience, we set up holding a gun (Code Eagle) on someone and then seeing if you could draw and 'shoot' them when they were giving you instructions. It did work out sometimes. Also, no guarantee of a immediately disabling hit - so they can still shoot you.