Parts to swap on collectable when shooting?

[thone]

Recently picked up a 1917 DWM and was lucky enough to have the numbers matching. I'd like to shoot it, but don't want to destroy any of the matching parts. I found a thread earlier that recommended replacing certain parts before shooting. I can't remember them all:

Grips
Extractor
Firing Pin

What else? Hold open?

Thanks,
thone