Just put a new stock on it. Nothing really to gain by trying to splice a piece on. Numerous reasons, first, your handgaurd, band spring, and both bands will be mismatched anyways. so even if you splice, you have a mismatched rifle. Second, you will plainly see the splice. Third, You will also need to solder on a proper sight base. Which, while may be correct, won't be original. Its only original once. Id suggest getting a stock and bands from Mario. I think he may even have a L marked kit. That was a while ago though.
Whats the story with the others? Matching? Codes?
I zoomed in and saw a Norwegian and an RC. That is the cleanest Rc Iv ever seen if thats the case.