It would be possible to get dimension accurate images of these ears by using a flat bed scanner instead of a camera after removal of the safety lever. . That would allow very high resolution measurement and comparison.
It's a project to take out all the guns and do this...
In any case, this is an interesting area with quite a bit of variability between Lugers and the possibility of a unique "signature" for individual guns at the "notch" area that Rich mentions. I think that this "notch" area may not be a critical cut for proper operation as long as it's far back enough, and the shape variance likely reflects both different tooling and technician operator actions when milling the area.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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