If you are just going to use this as a recreational target shooting gun, I would buy a new rifle and not go with a misurp rifle.
10 to 15 years ago, milsurp rifles were dirt cheap and the ammo was likewise. Today, the rifles are a lot more money as is the ammo and the ammo is a lot harder to get.
Likewise, if you see yourself scoping the rifle, don't butcher a milsurp rifle. It is, what it is. If you want to scope the rifle, just buy a new one that is ready/willing/able to accept a scope. Yeah, I know all about the mounts that don't require butchering the rifle. My statement stands.
FWIW: I shot a K31 in a monthly match where I used to live for years. We used bone stock (as-issued) milsurp rifles. At our local club matches we shot out to 400 yards and at a semi-annual match in a neighboring state we shot out to 800 yards. Again, with the rifle as-issued. I have fired thousands and thousands of rounds out of a K31. The K31 and the Swiss surplus ammo is a terrific combo IF you are looking for a milsurp piece of history. If you want a rifle with all kinds of add-on/bubba stuff hung off of it, just buy a new modern rifle.
I agree with the guy that said, buy an AR15. That is the rifle I shoot 90% of the time these days. Terrific accuracy, endless configurations, rail to go from irons to all kinds of different optics, very easy to work on, very easy to modify, very easy to rebuild............................