For home defense, get an alarm system and outdoor lighting, then build a moat. For defending the people in the home, forget about a firefight with multiple assailants, you're going to need one or two shots at one or two intruders in the hallway at night. I'd want either a .45 or shotgun, with a large flashlight.
If you want an AR-15, go ahead and get one after you get the other two weapons.
There is absolutely nothing wrong with the .223 round, except it is not suited for urban combat, hence the military's movement to .308 again in some weapons.
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