re: AR 15 for Home Defense

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I absolutely can NOT penetrate walls.

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You should be using a shotgun loaded with birdshot.

I am serious.

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Any shotgun is going to perform like a giant rifle at super-close range (like inside your house). I'd think that birdshot would almost be like a slug at such close range.

5.56 with frangible rounds sounds safer to me. Maybe something like Barnes Varmint Grenades?