DeeKay,
Meffert made one. I did an article on mine for the Winter 2002 issue of Der Waffenschmied, the journal of the German Gun Collectors Association. They are generally marked "Hubertus Gewehr 32200." They were available in a number of grades with both top lever and Lefaucheux style openers. It is a very 'cool' system. It isn't the trigger guard that moves -- it's the tang behind the trigger guard. It's not "wood and metal', it's horn and metal.