If the spring was discussed, there would be a reference to a Magazinfeder. Since this was recorded somewhere around 1927, and the M1930 didn't follow that much later, I'm pretty sure it refers to the box magazine version of the C96 pistol.
You may also find the references to 'Holzgriffschalen' (wooden grips) and 'Hartgummi' (hard rubber) interesting
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