I hope the OP isn't planning on buying a vintage, issue 1903-A1 rifle and then butchering it by mounting a scope on it eek

For that matter, doing the same thing to an issue 03-A3 is equally cringe-worthy.

If you absolutely have to have an 03 for one of those NRA matches, I would look for (1) an A4 clone, or (2) an 03 of any configuration that has already been buggered up.