So another hypothetical question. You know an armed and dangerous suspect is loose in your area so you arm yourself. Lets say it's with you AR or other preferred assault weapon of death.

You are on high alert in your own home and there is a knock on the door by SWAT or otherwise. Do you secure the weapon before opening the door? Do you return it to your safe or simply set aside away from the door and your person? Is there a protocol for such a situation?