The sights on the Model 28/30's are really nice also. I've got to photograph my Rossi pump model 62 SA in a little while and I have at least one of these old Finn's. I mis-spoke yesterday when I noted your rifle in my reply. I should have been more clear: Your rifle was originally built in 1939. The Finns captured your rifle which started life as a Model 91/30. The winter war started in 1939 and my bet your rifle was captured sometime in 1940+, and the dead Russian removed to the ditch. Taken to the workshops of SAKO. The forend was cut off and a new forend of Arctic Beech was tongue and grooved in place of the original wood. The wood, in this instance, is resistant to deep cold that would cause changing in sighting as it probably did with the original crude Russian sights. The trigger was also changed to the latest SAKO design and gives you a very fine double stage trigger at perhaps 5# or so. The Finn property marking "SA", is in a round cornered, rectangular box and is stamped at the base of the barrel on the left side near the front of the receiver ring. The base of the barrel still shows the Russian Eagle in a round cartouche on the barrel reinforce at the top. You will also find "1939" stamped adjacent to the hole for the tang bolt, but you will have to take the barreled action and turn it upside down to see it. (All Mosin Nagants have the manufacture's date there). The groove diameter of the new SAKO barrel was also reamed at .308" rather than .312-13", again for accuracy purposes. And SAKO did this during wartime. Somewhere on your rifle, possibly on the right side of the receiver ring near the woodline, is the Finn Civil Guard number. This will tell you what Civil Guard District the rifle was issued to. (Pull the table off the net). The Civil Guard Cartouche is also stamped in the wood.
With all of this in mind, now you know why the rifle shoots as well as it does with a few battle scars on it.
They are elegant riflesa1 (Yours even has its cleaning rod! I shoot mine only with cast bullets to preserve the barrel.