New to me 1903, April 42 barrel and receiver.

[bczandm]

R stamps on front sight, upper band, lower band, a P on the trigger guard but I can't find the R on the rear sight, but there may be an "I" under the rear sight when you lift it up, but it could be a nick in the metal. On the sight portion that moves for elevation there is an X and possiblyan O or 6 on the bottom side of it. Where would the R be on the rear sight? I also noticed E, Q, N and 2 sorta randomly placed on the front stock flat area that is in front of the upper barrel band. I'll note that they are randomly placed meaning that they are not in order or stamped from the same angle.
Bolt has an R on the bottom. Has a large P in a circle on the stock, as well as the squares/triangles/circle marks on the bottom of the stock like I've seen on many others.
Any info is appreciated, I am very interested to learn more about the 03's.
Thanks in advance,
Bob
BTW- There are two R's under the bolt. One on the bolt handle and one on another part near the bolt that might be referred to as the bolt sleeve.