Hi again Guys, here are some pics of the Smith Gun and it's approved ammunition. Oficially known as the Ordnance Smooth Bore 3 inch or OSB. A weapon mostly issued to the Home Guard for anti tank and HE purposes, apparently also used for airfield defence in small numbers. If I remember rightly there was a Dads Army episode with one in, probably just a wooden prop though. Hope it is of some interest. Tony.