Moisin-Magan 91/30 double date

I cleaning and iuling my 91/30 and I always asked myself why to date on this one and what is thre meaning of MO too? Is there a link with the refurbish??

Thanks

The common thinking on the dual date and MO stamp is that it was a regular military rifle (in this case, manufactured in 1934), removed from front line service and re-issued to the ministerstvo oborony - the Ministry of Defense (in this case, in 1950).

Is there any reason to stamped and identify those who are re-issue? The army is not iunder the authority of the same Ministry (Defense) too?

My knowledge of the subject isn't the best, but the Ministry of Defense wasn't technically military, if I recall. They were more of a government security agency overseeing all aspects of life with the need for their own equipment. Maybe somebody more knowledgeable can shed more light.

In very rare cases, you can find triple dated firearms - weapons with 3 different years stamped on them.