1. Were the trigger guard screws used on the M1903 and M1903A3 made to identical dimensions? If not, how do you distinquish between them?

2. Were the M1903 guard screws made by SA, RIA, RA, and SC indentical? Is it possible to distinquish the maker? If so, how?

3. Were any guard screws made by civilian contractors? If so, by whom?

4. At what point in SA/RIA production was the "Parkerized" type finish implemented?

Thanks.
Information
Warning: This is a relatively older thread
This discussion is older than 360 days. Some information contained in it may no longer be current.