In what I've read on them the Finns would test drive captured equipment, refurb what's needed or if in good shape & meeting their specs, would get put into service. That's why there's some Soviet rifles with Finnish markings and no change to the rifle other than rear sight markings and obliteration of the hammer and sickle. Not common as many needed work but a few did make the cut for their purposes.
I've a '95 Tula, original barrel, with the forend spliced and otherwise as issued besides markings.