How would shotguns work for combat

One of my friends wanted to use a shotgun for his gun. The shotgun can fire 4 2 round shots in one sitting before a reload. I was just wondering how this would work for weapon mechanics or if he could even use it. Thanks so much also for everyone that has been helping me with the rules of everything.

It can only fire 1 shot per trigger pull, so it would either need to be modded to do that, or packets would need to be used.

Gotcha thank you so much