Here is an interesting Mosin for your viewing pleasure. This one appeared to be a "put together" gun from different parts, some of the pre-war manufacturers, like most post-war refurbs. This one bears interesting markings on its barrel shank, an Izhevsk arrow in a triangle and a 1950 date. It also has an Arsenal # 2 stamp. A quick internet search showed at least one similar rifle(gunboards I believe)with the same Cyrillic prefix exists somewhere in Alaska.
It is interesting that the USSR officially never produced 91/30's in 1950. Was it a run made by Izhevsk from the existing parts lot for an unknown client and then ended up at Arsenal # 2 later? Or a run made by Arsenal # 2 from the existing parts lot? In my opinion, these markings are out of the established refurb "specs" at that time so that it could have been an unauthorized initiative of somebody at the Arsenal # 2...Anyway, it looks like some arsenal made many rifles with the 1950 stamp.
Also, the rifle was built on a 1948-dated receiver and fitted with a post-war production barrel. Looking at the bottom of the barrel shank, you can see the steel lot number stamped along the barrel line like on the post-war production carbines, not across, like on pre-war and wartime rifles.
Post your thoughts and the pictures of similar rifles here.
Here is another that one of the old regulars on gunboards (from Alaska) posted about years and years ago.