From factory records your receiver had its serial number stamped on in late June 1943, so a reasonable guess is that the carbine was completed in July. As has been pointed out, a photo of the rear sight base will tell alot. A photo of the safety from the right side, the front barrel band, barrel marking just behind front sight, and stock markings, particularly in the sling well (near the butt on the left side), will also help. If all of those turn out to point toward a gun in original configuration, then a complete listing of parts markings would then need to be compiled.

If it turns out that you have a rebuild, replacing just the rear sight, safety, front band, and stock to restore the gun to original configuration could easily cost you $400 - and is fraught with peril, especially to a newbie, as repro parts abound. And that could be just the start - many small parts would still need to be located.
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