My understanding:The typical mauser was not hardened on all surfaces.The rails,and most of the receiver body are soft.They will stretch,bend,etc,but they won't fracture.
Only the critical areas such as the locking lug recesses ,extractor cam surface,etc were locally hardened.
I cannot say there is no such thing as a mauser that is soft in the wrong places,but it is wrong to reject a Mauser receiver if the body of the receiver seems soft.
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