There's no way to predict the size, tenacity or what an adversary will be wearing. Buy a gun that will digest any factory ammunition and load the magazine with a variety of ammunition.
Avoid bad parts of town, don't answer your door anytime of day unless you see who it is and know them and don't go in convenience stores late at night.
My father always told me nothing good happens after midnight, be home, great advice.
Your first line of defense should always be avoidance, which starts with situational awareness.

Avoid bad parts of town, don't answer your door anytime of day unless you see who it is and know them and don't go in convenience stores late at night.
My father always told me nothing good happens after midnight, be home, great advice.
Your first line of defense should always be avoidance, which starts with situational awareness.
