Late WWII M1 Rifle Stock

Friend called about a 3.5 million M1 Rifle he found. Barrel date is 3-45, and stock is SA/GAW. Rifle was not priced as a collector, is in original finish, and all parts correct. What is the latest thinking on just how long the GAW cartouche was used before changing to NFR.

Johnny, GAW stocks were used up until around April 1945, well into the 3.6 mil serial number range.

Thanks Tom. I was thinking I remembered them going into at least March, but wanted to be sure before I told him that. Rifle was an early 1990's DCM purchase.