well, Mahrholdt was a friend of Schüler and I am sure that he got at least the barrels and actions from Suhl. believe he was the only one selling schüler cartridge rifles in austria. Burgsmüller may also have buy his big bores from Schüler but if you compare the full stock from Marholdt/Peterlongo with the Burgsmüller illustration(when this is correct!)I think it speaks for itself.
the burgsmüller stock looks like... this is the weapon for the first strike.