Was reading through some old issues of Airgunner and Airgun World and it seemed back in the late 80's and 90's that AirShotguns were all the rage .
One called the Pegasus , was a Tac / Bac so now fallen by the wayside .

But traditional Airguns that are smoothbore and use 'shot' ammo instead of pellets ?
Oddly the Pegasus makers also seem to have done a air shot shell conversion on a HW break barrel model using little shells loaded up with wad and lead shot and power provided by the spring ..

Falcon Pcp had similarly some mods done to a batch of actions by L.J Cammell in Merseyside . Ugly looking thing but interesting called the Ulti-Shot

Most recently , like 10 years ago , I remember the Crosman 22xx Air Shotgun 'kit' , you could remove your barrel and stick the smoothbore tube in its place ..quite a neat conversion and power was okay for blattin tins . Think it loaded 3 bb's and were held by a magnet that came as part of the Kit .

So Airshotshell airguns - why is nobody making them anymore , in UK sub 12 ft/lb spec - not seen any for ages - are they still legal ?
Low power was always the issue with them so popularity rather than any legal issues surely ?

I can see the fun interest - at Clubs outdoors you could have a mini clay range