Remingtom Rand HELP

I just picked up a RR that came from a estate sale. It looks like never been fired. Old man suppose to have brought home. from WWII
Sorry I can't post as no cam at present. So please help with a few items.
I remember reading on WWII gun somewhere that parkfinish sometimes slighty different first couple inches on slide.Due to heat treatment I belive. This one slightly darker first couple inches. Other wise all the same.
Now here where I need help.
Serial Number N O 1007xxx year made?
Barrel has BFI on hood lower L/side also has a S and a P L/side near link pin. One on each side of pin hole.
On slide under fireing pin retainer are l l above and G below fireing pin hole.
Mag has a G stamped on bottom top of extension. Did find a reference to General Shaver made for Remington. Mag is also 98% and I would rate pistol close as only mark is small dummy scratch from slide stop. This pistol is nice and tight not a rattler I belived was cleaned more than shot
I have a Colt USGI made 1941 and I wanted another USGI I gave 650. Did I pay to much. . I know I nevered carried on this nice when I was in.

On barrel lug is a S and a P not G my mistake. I was told is springfield barrel and they were used during time. I found that at another location. The BFI is suppose to have something to due with the heat treatment?. I was also told the Blue /gray finish isn't a park. but a different finish that Remington put on. Put next to my 1941 ColtGI theirs a big difference in color.
Iam learning and grathering information . I thank every one who had answered I hand my colt for many years and never really looked for answers. But this Rem. is first pistol I bought more for collection than shooting. I have enough 1911 and other for shooting. Not to say the Rem won't see some 230 ball now and then. After all that what its made for .