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I just had the luck to get an Mm410, SN 45043.
The bolt has an fixture that i have never seen before on the early models, but maybe on this model Mm410 it was usual?

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Here you go. A thread with the model. Can't answer your question right now though.

http://forums.nitroexpress.com/showflat.php?Cat=0&Number=266021&an=&page=0&vc=1