[Richard Sheldon]

I have a parker stock with receiver but no barrel or forestock. My father, back long, long ago, sent the barrel back to the parker factory to get reblued but never got it back because they went out of buisiness.
My questions are:
How can I tell what gauge it is.
can I purchase a barrel and forestock.
Is it better to buy a complete gun and keep this for parts.

The stock is a little beat up with a small split, receiver has mild surface rust but should clean up nice.
I've allways wanted a parker and would like to get what I have useable. (And it was my dads when he was a kid) that means a lot to me.
Any help would be appriciated.