see a very interesting old east german Buehag 16 ga sxs with a SEM mount by a local dealer here. the action is great a cape gun-double gun action, of course a project gun for a double rifle. dont know what the price is. came new in the shop last week but only a SEM mount cost over 800 euro now.
old hunting law make it difficult with rifles in former east germany but a SEM mount on a shotgun was no problem in this time.
when I get pics will post it here