Hi Otto ! I don't know about the regulating device used by Merkel, but since I made the terrible and expensive mistake of buying a Krieghoff double with a comparative device, I can tell You to take care, at least my double was a piece of crap. The regulation with this regulating device is switching all the time, propably because of the moon phase, Dow-Jones or whatever reason, but wounding game with such a gun is a experience I do not recommend, because there is no one to blame but You, the owner of a inferior weapon. After this experience I am dreaming of a Heym 88B, which has a rather proven reputation.

Wicked good hunting !

Kalunga