SN BB4 16" triples = SN BB5 16" quads. Don't let me get started on the SN BB4 12" triples. It's now a BB3 gun, that no BB3 can use.
Mandel is slightly less then Bismarck, maybe same as O-ProII range.
The other Mandel guns are to heavy for use aswell.
So from BB2 --> BB3 lol