Oskar,
That is precisely the model I had in mind, one of my hunting friends in Germany hunted with one in 7x57R/12 ga. The lockup is also very strong.

builder,
Oskar is better qualified to answer, but I think both triggers function as a single trigger, with the front trigger firing the top barrel then the bottom, and the rear trigger firing the bottom barrel then the top. If my memory of this is incorrect, I hope Oskar straightens me out.
Mike