I agree, 915273 seems likely, 9 million is simply out of the question. I wouldn't say an arsenal mis-stamp adds any collector value, certainly not to me. The barrel date is consistent with it being original to the receiver. It appears to have a lightly sanded and refinished replacement Rock Island Arsenal "scant" stock (less than a full pistol grip).
The scant stocks were made during early US involvement in WWII for 03-A3 production, but 03-A3 stocks were suitable for use on M1903s as well. Left over stock blanks from the M1903 standard straight wrist stocks were used to make the new milspec standard pistol grip stocks but the existing stock blanks were not tall
enough to make a full pistol grip, hence the "scant" term.
The problematic receiver heat treatment SN cutoff is 800,000 for Springfield Armory M1903 receivers (the cutoff is probably lower but that's the certain number). A very well defined number of 286,506 is the cutoff for Rock Island Arsenal receivers. Therefore, your example is definitely in the no concerns about shooting
range of serial numbers*. If it has decent rifling left, it ought to be a nice shooter
* I am not a lawyer or legal representative of the former Springfield Armory US federal government arsenal, so my opinion is meaningless, should not be taken as a recommendation, and you should shoot this 99 year old rifle at your own risk.