Too Immanuel Meffert seemed to be a big fan of Rheinmetall vessels as many of their offerings are fitted w/ Ehrhardt Lauf. Maybe there was a link there directly or thru Rmerwerk / Rmer & Compagnie / Rhmer und Compagnie:

http://www.germanhuntingguns.com/archives/romerwerk-the-becker-revolving-shotgun/

I can't say there was a link but I am mining heavily in that direction.

Cheers,

Raimey
rse