You're an even bigger "dumbass" if you think a .223/.556 round will penetrate less then #4 Buck. 62gr @ 3200fps. or 21 .24in pellets@1300fps. Hi-power rifles are generally not a good HD setup unless you live in a rural setting where over-penetration is not an issue. If I lived in a shared-wall dwelling I would not hesitate for a second to load up a pump 12ga with birdshot. May not kill, but take a round or two of birdshot to the face at 12 feet and see if you don't seriously consider changing whatever course of action you are pursuing.
At the face, eh? Good luck with that under extreme duress cowboy.
AR's and the like are fantastic home defense weapons. Especially those in a pistol or 14.5" configuration. The chances of an injury from an over penetration resulting from a 5.56 round are a very low percentage. I'd much rather have the increased magazine capacity and the ability for quick follow up shots than a shot gun. But that's me.
When I use to keep a shotgun for HD, it was: 00, slug, 00, slug, 00. Repeat until full. I wanted the ability to shoot someone through a door.
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