Welcome Bill,
The RWS-48 is a fine rifle right out of the box, I don't own one either, but all that I have read concerning them has been very good or better.
If she's shooting nice and quiet, no spring twang, I don't think there's much to do.
I'm sure our other members that own an RWS-48 will add there insights as they return from there 4th. of July, Independence Day, festivities!
Best wishes on our Nations 231 years of Independence !
Another Bill ;^)