I'd say that in keeping his cost low and his profits high that this firearms merchant cat Chr. Hoffacker of Munchen sourced a gesteck or parts kit, possibly from various sources, & then contracted with some talented mechanic in either Zella Sankt Blasii, Mehlis or Suhl to complete the project. For the moment I'd guess the strength to be similar to those Krupp steel tube imports into the U.S. of A.

Kind Regards,

Raimey
rse