i believe the front of reciever rear leaf sight was for a 1903.
the 1903A1 had a rear mounted peep sight.
they were making a few 1903 at the advent of WWII, but switched to the 1903A1 rather quickly
cheaper and easier to make.
You're talking about the 1903A3. The only difference between the 1903 and the 03A1 was the C-stock (full pistol grip).
Bob
