If somebody has got one, can you tell me how is a .22 single shot insert viewed/treated from a legal point of view in GB please ?
Does one need to have a 22 slot for it on their FAC or is it deemed as an accessorie for the main "authorised" rifle on the ticket ?
Just to be clear, I am talking about that sort of thing that enables to shoot a .22 round into a full bore rifle.

Many thanks for you help ,