Free: Contests & Raffles.
I would leave it as is
I would do whatever makes you happy. Myself, I would have have it re-blued. Are you anywhere near Chehalis? I can recommend a gunsmith who does bluing and he has a real quck turn around time too. So you wouldn't be without if for long and wouldn't have to worry about shipping it.
The only thing I'd touch it with would be oil
Do you know production year?
Yup. Standard velocity only in mine. I was told I could swap springs to use high velocity, but I don't see the need.