Original sentence: A shotgun sawn down to a length over this limit may be owned on a Firearms Certificate, or a Shotgun Certificate if the barrel is 24 inches or more and it has either no magazine, or a magazine that holds no more than two rounds, and is not a revolver gun.A shotgun sawn off so that the barrel is less than 30 cm or the overall length is less than 60 cm is considered to be a prohibited weapon
Edited sentence: A shotgun sawn off so that the barrel is less than 30 cm or the overall length is less than 60 cm is deemed to be a 'short-barrelled' shotgun and is prohibited