>>718682828
Oh, you're just unironically retarded. My bad, senpai.
They are heavily used in trench and urban warfare.
There were news articles about ukranian partisans preferring them because of their ability to send 16 projectiles into a column of infantry in less time than it takes a rifle to do the same.
The Germans famously (allegedly) tried to ban them in WWI.
Every breaching team carries at least one shotgun. Every swat team carries shotguns.
The usage of the word "balanced", juxtaposed to "IRL" implies that you have a very poor understanding of reality and its physical impositions. I was correct in my assumption. Have a nice day, retard.

>>64057981
Photo of a homemade belt fed 12ga AR upper. Looks like it has to pull the shells backwards out of the belt and then down to chamber. I don't see how you can have a practical push-through belt with 12ga but it has been done with rimmed rifle cartridges so it might not be impossible.