I just got my 39A (that I originally bought back in the late 70s) back from a three month complete makeover. Here is what was done:
1) Hand fit a select checkered walnut stock and hand rub to a gloss finish.
2) Complete edge rounding of finger lever I started years ago. I rounded the trigger myself and had it gold plated.
3) Disassemble and have all steel parts polished to a mirror finish and have them deep dark blued.
Here is the result (that is the reflection of my hand in the first picture):
When I first got it back it was a bit dry so I took it apart, slicked up the action, oiled it, adjusted and reassembled it. It is now tight and slick and shoots perfectly with pin-point accuracy.
This is now the finest rifle that I own.