I thought it was Umarex or Walther - the GSG guns have never had structural issues, that I'm aware of.
Maybe not frame or slide problems but definetly small part problems, namely barrel bushings. They have always felt cheap to me. Edit- just read about prematurely bent guide rods this AM and judging by the suppliers response, was a well know entity as well..
I did a quick google and they usually say Mosquitoes are GSG..
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