You say a factory barrel, willl you be putting a smooth bore barrel from one of the rifle stocked versions on? Cutting it down in length?
Could be a potent little snake/rabbit/squirrel gun, but why the change to smoothbore? Hoping for better patterns?
"As we know, there are known knowns. These are things we know that we know. We also know there are known unknowns. That is to say, we know there are some things we do not know. But there are also unknown unknowns, the ones we don't know we don't know."