But... it can't be a Mauser receiver. from 1940, they were milling the ears with the hump at the back...
What are the details of the geometry at the front of the frame relative to the position of the locking lever and the receiver lug?
If this ends setting the receiver too far back with reference to the place where the toggle contacts the receiver ears the timing of the action could be changed. it's subtle, but also critical to proper function.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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