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Here are a couple of pictures of my FR-7 (Top) and FR-8 (Bottom) with bayonets.
The FR-7 has had the receiver scrubbed there aren't any markings except the FR-7 and serial number on the left side.
Both rear sights slant back on my FRs.
Here are some great photos of a Spanish M43 that escaped conversion. It's neat to make a general comparison and also see the original markings. Thanks to stoggie for the idea and also JacquesT for permission to use his pictures. Cheers guys!
Note the new serial number with designation and also calibre is on the opposite side. I've also seen a few FR8's that were blued instead of parked, perhaps that was another change in production at some point.