Steal the stats from the USAS-12 and adjust mag capacity, ROF, etc, or shamelessly rip off the H&K CAWS.
Then spend the rest of the campaign showing him just how friggin useless a shotgun is in combat outside of a very few instances.
Shotgun < rifle
There are a few good uses for them in urban warfare. I still prefer a rifle or SAW, but shotguns have some utility.
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