Interesting rifle. I'm pretty sure the receiver serial was added post war. Definitely a wartime receiver but it appears to be scrubbed/polished in areas and renumbered.
Personally I would have kept the stamped trigger guard and floor plate as they are far more "correct" for a swp45 than the early milled stuff but since it's a m/m post war refurb it really doesn't matter too much.
Thanks for posting. Nice rifle.
