Charlie, you have shown so much interest in my new find, thought I'd post a link to some pictures for you.
The only marking on the stock is the Proof P in circle under hand grip, and it is stamped, not inked. Stock doesn't appear sanded so I really don't know what I have. I do know it is not the large (beefy) one. My hands are small.
the only other code I can find is the PN on the bolt.
It is:
7790186
TRW ZH
I am assuming it is pretty much a std commercial M1Aicon with maybe a replacement stock.
Thanks for all your help.
Regards
Reed

M1A pictures by colreed1 - Photobucket