I found this at a small local gun show this weekend.
It is a nicer original mid 43 rifle.
Sometime along the line the 300 yrd flip was modified.
I have seen this on a few other original carbines.
The story I have heard is it was easier for sighting at night.
You can post here or pm me if anyone has any questions.
Here are some pics and a link to the photobucket album.

inland 522K pictures by usgicollector - Photobucket

Dave











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