Advantages over a shotgun are:
More reliable (no short shucking)
Less recoil (faster follow ups)
30 round capacity is incredible
Superb stopping power with tac loads
Limited wall penetration. Penetrates less than buckshot or even pistol rounds.
So the reason the ar has replaced the shotty in police use and for home defense is that it kicks less, holds way way way way way more ammo, is far safer for neighbors and bystanders, is much easier to shoot for many, has far faster rapid follow up shots, and is just as good if not better at ending the threat. It can also be pressed out to 600 meters if need be.
The shotgun is a relic. Workable, but almost totally obsolete.
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