What does an AR-15 do to a human body? A visual examination of the deadly damage. - Washington Post:

This is not a pretty read. This is meant to be traumatic, because the subject matter is exactly that.

If you can view this, and still think any civilian should be carrying .223 or similar rifles, you are certifiably a monster.

The animation glosses over that a 9mm or other handgun ammo can also do hydrostatic shock, and depending on slug can still do massive trauma, but even with those considerations it’s nothing like the energy-transfer, cavitation, and fragmentation trauma from .223 or 7.63 rounds issued for combat.