I have heard of this condition...I will post my results. One thing I did find out about this gun is the owner removed the shims he had in it to use in another K98icon he has. He didnt mention that at the time. IO found this out from another friend of his. I found several several articles on what to check for proper stock,band,handguard,action fit. The Fpin actual looks very good under the magnifyer. Nice clean no pits ect ect. I have nothing to judge the spring with. Looks good, no rust,kinks,nice flats on the end "feels" strong.
It will be a few weeks before I get back to this. I will post results.