I see what you mean. The sight you show looks like one used on a Vz24 and you are correct, there never was a lip for the hand guard. The hand guards used with your type of rear sight had a spring clip inside them that clipped onto the barrel between the receiver and rear sight. Is it possible that the barrel was changed at one time or at least the sight, because the sight you have would not have been on a bnz 42 when it left the factory.
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-Peter
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