Congratulations!!! Looks like you have a firearm which will be a delight to shoot. I belong to a club with a hi-power league, and quite a collection of M1s. Each and every one has had the op rod spring replaced, and the best-of-the-best are those which were custom made for Anthony Pucci, Jr. at his Long Island, NY business, Orion7 Enterprises. Sadly, Tony had some medical issues, but his son Michael now runs the business. You can get the springs from Michael (631) 205-1299, and/or through many after-market sellers who buy these in bulk from him for resale, on eBay and similar sites. (I have one in my Garand!)
I cannot recommend these highly enough!
BEST!
geo