Stripping that original Remington RKW finish is no easy task.
If you took the time to do so you are certainly invested in your M40 project.
Regards your scopes......
The original Redding will provide you with a more authentic experience even if it is not green. If
@tokiwartooth comes online and wants to take more anodizing work you may at some point in the future get to have your Redfield greened up.
but......
for plain shooting I prefer the Leupold replica.
I have set a solid 100 yard zero than use the mild dots for holdovers. No need to worry if the scope is repeatable because I dont move anything.
with 5 mils I have figured close to 700 yards of use. Recently I was going to bring my M40/Leupold combo to a 900 yard range but that got screwed up.
To go that distance I had intended to determine the magnification setting needed to double the value of my mil dots (plus or minus 4.5X) than use that setting to get up to 10 mils through the glass.
The Leupold scope with mil scale will be the most useful of the two scopes if you want to use the rifle as a regular shooter.
I just recently got my second M40esque rifle, this one chambered in .223 both it and its .308 brother wear Leupold greenies.
For a time I had a Weaver T10 on my .308 M40. Its a fantastic scope with some USMC useage (M40A1) but it just didnt give me the M40 experience I was looking for.
Keep us occupied with lots of pictures of your project.