I have a nice stock all original Remington Rand built in late 43. A good reliable shooter and not in the least inaccurate. It would be a crime to modify it in any way. It is history. There are plenty of cheap non military shooters out there to modify. I’m sure mine has seen arsenal work but both the slide and frame are RR and who knows .... It might have been used in WW2 Korea and Vietnam.
A pal in Iowa owned two of these; both rebuilt at an Army arsenal. Neither one could be said to be accurate except out to 25 feet, maybe. Your RR is a jewel.