Gary Stewart, 53, of Woodgate Avenue, Chessington, pleaded guilty earlier this month to having the weapon, designed to look like a camouflaged hunting rifle, in the theme park's overspill car park in January.
He was with friend Andrew Moore, 39, of Barnfield Gardens, Kingston, who also pleaded guilty to having an airgun but denied breaching licensing conditions relating to another matter.
Stewart said Moore was showing him the rifle and how it fired because he was thinking of buying one and he “knew more about them”.Oh, good grief! And you couldn’t think of a better place to do this, than a public car park?
Magistrate Carole Hopkins said: “We find this to be a serious offence, so serious because you were where members of the public frequent. ”Yes, yes, hoplophobes all, but seriously, have a bit of common sense, chaps!