The inscription of the serial number on the toggle link was necessary to keep the receiver and rear toggle link together. All other parts (sans frame) were made to such tolerances that they could be swapped out, no need for serial numbering them.
One major improvement that Mauser made, was to produce the small parts to such tolerances that the in the white pre-fitting was no longer needed.
The rear toggle link had to be hand fitted to the receiver, however, to prevent the gun from moving to the left or right during recoil.
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