A double 12 bore handgun purposely made as a handgun would be OK - here. To cut down a shotgun, even re-stocking it, would make it prohibited - ei; sawed off shotgun.

You can shorten a shotgun to an overall length of 24"(which is really shot and 'nasty' looking, but it must still be designed to be shot with two hands -ie: visible and useable butt stock. This means the barrels could be very short.

However - first cop or game officer who sees it will confiscate it - gauranteed. You'll get it back, but it will be gone and you might even get a ride in the back seat of his/her car. At least, if a game officer sees it, they'll call the police and hold you until a PC arrives.

No explaining on legal lengths will work - they aren't interested in what's right or wrong according to the law - only that that shotgun has been cut off and looks bad enough it should be illegal - such is the system here.

Legal barrel lengths are subject to semi-auto's only - 18 1/2".