You seem to have quite a stash of info at your fingertips. The window with which you are interested is more centered on implements of war rather than sporting but the technology developed in the war phases pretty much drives the sporting weapons wagon. Some may want to separate the two but they are most intertwined. I'm not positive as I don't have the text, but "Reichsarbeitsblatt: Sonderheft zum Reichsarbeitsblatt" from 1930 may have the info you desire with some association to Thüringischen Metallindustrie. Godspeed on your endeavors.
Kind Regards,
Raimey
rse
Kind Regards,
Raimey
rse
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