Re: Question about a Sprgfld 1903
That serial number suggests an "S" stock. The "C" stock, If I remember correctly, came out later. Many of the early ones were refitted with the C stock during and after the war.
Actually, a sporterized 03 or 03A3 is a part of our history. Many thousands were purchased and converted to hunting rifles after each of the two wars (most after WWII.) I got mine in early 1948 and did not replace the stock. I did take off the tip of the upper forearm and shape the lower forearm. I left just enough to leave the sling swivel in place. Then I mounted a nice recoil pad and put Lyman triple peep sights on it. I used that rifle for 1000 yard competition and hunting for several decades.