Remington use to make a pump action smoothbore .22 shotgun, buddy of mine inherited one along with the thrower and a partial box of small claypigeons,when he was younger and got a case of the stupids and traded it in on a remington 870 shotgun, would have bought it had I known.
BTW (remington) they did do a collectors run (remake) about 5 years ago, but they were around 5-600.00 for them. Marlin did have a garden gun smoothbore, but i believe those were produced through the 90's and then discontinued.
those little guns were great for pigeons in the barn, wouldn't go through the roof or barn boards, but boy that shot could bounce! Man, I wish NEF would make a barrel for one of those! I would beat down the door for one
they were heck on gophers in the old orchard too, and didn't tear the grass up like a .410 would, plus they had a range of 20 ft so no worries about were the shot was going
I have seen the 9mm guns but I believe that they were offered more in europe than over here, someone did a write up on them, but can't remember for the life of me who....
Sure wish I owned one.....maybe one of these days.....