I handled hundreds if not more, Swedish rifles in the 1990's. I saw lots of over strikes to floor plates, stocks, stock ferrules, buttplates, and bolts, and they must have been made by Swedish Armorers and Depots. These rifles had a past life, they were used, issued, things got lost, etc. I think I have one Swedish M38 where the bolt number was serialized to the receiver, but the stamper accidentally switched a couple numbers. So, instead of 139765 the bolt is stamped (for example) 139756. I consider the bolt original to the rifle.
Authenticity, what is considered authentic, what you accept as authentic, what others believe is authentic, is more an emotional issue than material.
This ship is less than 25% original wood.
View attachment 1047179
so is it the authentic USS Constitution, or some replica?
The rifle does not care if it is 100% authentic or not. I would say, if your Swedish rifle is otherwise fully matching, has a nice, bright barrel and crisp rifling, keep it. When I got an all military vintage bolt gun with a mint barrel, I bought it.