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I have done the tests and 9mm does penetrate hard targets worse than .223. You have to consider what the bullet does after it passes through the material. .223 will make it through but lose most of it's mass and velocity in doing so. 9mm has a lot of punch left after it passes through these materials. Yes, I have tested it myself.
I have a nice shotgun for defense, but the only reason I grab it is because it is handy. The AR is too expensive and it is locked up. If I had my choice, my AR carbine would be the gun of choice. If you are trained in it's use, it is the weapon of choice.
I would not be so quick to dismiss it. Just because it is not your choice, and not the old school option, does not mean that it is without merit.
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