Thank you all for the great and in depth information that I have received from you all, it has all been a great help to me.

I have decided to keep an eye out for a small quality scope from the eighties to keep the rifle looking as original as possible.

I do have some other questions though please, if anyone has the answers:

The Hw35 that I have has a barrel length of just over 16 and a half inches, does this mean it is a k version or has it just been shortened by a previous owner?
The stamped barrel just says Hw35.

It has good power (not chronographed) but seems very loud when firing. If I were to have it tuned would it quieten it down?
The previous owner stated that he had recently changed the spring and synthetic seal but that is all I know.

Thanks as always.