I couldn't get the reference to work but if it is this one:

it is interesting in that it only has upper overhanging scears. Regarding the chokes, Sauer in what I think was a S,D&G's advert. noted that any choke could be ordered as well as there were 2 levels of patterning effort(with the upper level addressing pattern distribution as well as distribution after multiple shots thru the same tube) of course with added expense, but if a choke preference wasn't given, full in the left and modified in the right was the norm. Anyone know if Lindner had a patterning board or target range? He may have used Sauer's or sub-ed to Sauer. I've seen a couple of examples with 26" tubes and own a pattern welded version, which is one of my favorites.
Kind Regards,
Raimey
rse