Hi all, it's my first post of milsurps.com!

I'm working on restoring a MkIII and have a question about features and bolt markings.

My rear sight windage slide is peened so that it can't move side to side more than 0.5 - 1 mm. The mechanism on the back would work if not for the peening. I've post a photo here,
Ross - Google Photos

I've also seen another members rifle posted in this forum that has this feature,
https://www.milsurps.com/showthread.php?t=57218

From what I understand this was not an official change to the rifle... but there is more than one that has had this done. So I was curious to know if anyone know who did this work?

Also, the back of my bolt has a stamped combination of three numbers on top of two letters, the same as shown in photos of another members rifle posted in this forum,
https://www.milsurps.com/showthread.php?t=57218

From what I understand there should be no stamped numbers/letters here from the factory. I was curious to know if anyone know who did this work? Maybe it's related to question 1. I've poked around using the search function for answers to these questions and so far have not come up with anything. Thanks all.
Information
Warning: This is a relatively older thread
This discussion is older than 360 days. Some information contained in it may no longer be current.