Here is what I've found recently.
There are two main versions about those:
1. It was modernised in early 30x like many 1891s
or/and
2. Modified and/or modernised in 1941 for obvious resons
in any case it was revoken after the WW2 and put into long term storage as all the rifles.
Enjoy. The history of Mosin Rifle in one particular item
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