I don't know if the OP is gone or on vacation, but if he returns he should read this:
Am I the only one who caught this? He has a WW2 R-R that has only had a "couple Dozen " rounds put through it????
You shouldn't be shooting it at all!!!! It is near new and seventy year old military pistols that are near new have collector value. Lots of collector value! Of course, it is your gun and you can do whatever you want with it, but if you take it to a smith to modify he might refuse, and repeat what I just told you.
It is a priceless piece of history. If you must shoot it, then shoot it, but please don't modify it.