Problem is solved. The sales contact tried to convince me by mail looking to my photos, that the right tumb safety arm, which sits in the frame to move up and down was to long or i had not the knowledge how to install a tumb safety.
I just swapped the tumb safeties from my orginal Tokyo Marui Hi Capa...these fits just fine in the advanced frame and the expensive tumb safety fits just fine in the Tokyo Marui frame. Expensive lesson learnt : not every custom parts from the same shop fits.
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