Mauser micrometer - missing part?

Hello again:

... ball bearings in .177 size ...
Indeed they are ...

But (as I learnt today) BBs are 0.177".
That's 4.4958mm or 4.50mm as they are usually referred to.

So, much to my chagrin, that's a dead end.

It still seems rather strange to me that Mauser would use a part with a strange specification for one of their most prominent/popular production items, millions were produced.

Maybe the original part is not a ball bearing?

Thanks for your input.

Best,

JHM
 
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