I don't know but my thinking is you will want to be bloody careful with putting a suppressor on there using shot. I've seen shotgun pellets leave barrels at near 45deg in low light so I can't see why you wouldn't have the odd random pellet do the same out of your smooth bore, which could fck the suppressor.
The suppressor would probably need to be one of those solid middle tube type baffles with the gas ports angled back so that shot can't be redirected by the baffle. Don't try a dpt/sonic baffle type or it will catch the odd pellet.
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