Congratulations on a very nice rifle! Looks just like my CMP Special. New Boyd's walnut stock & Criterion barrel? If so, it's historic, but not collectible, so shoot it.
Mine is in the low 2 million, October 1943. You're in the low 3 million. There's a website available to help date your rifle.
Don't know if you need advice but here goes: Take it apart and do something with the wood. The Boyd's walnut stock comes merely stained and is a little rough. May need fitting, watch for op rod rubbing the stock, and maybe want to sand off the stain and oil it like when they were made in WW2, to be more authentic.
Also, grease it/ oil it before you shoot it. Mine came from CMP bone dry. Not complaining, just saying mine wasn't ready to shoot right out of the box.
Beautiful piece of history there... I wonder if mine made it's way through Anzio, Utah beach, or assaulted Iwo Jima. I would love to meet the soldier or Marine who carried it. Bottom line, enjoy it and shoot the heck out of yours!