I'll try to find the images of the 8-gauge gun mentioned above.

The book is at the publishers' who are making up their mind about it.

Well, if you noticed smile I don't refer to TOZ-123 as a "4-bore" any more, but as a "4-gauge", which it is. It takes 4-gauge shells, at least. Did I mention it was originally developed as a police riot gun, to fire tear gas grenades and gum balls? I'm curious as to how you got to have yours.