Don,

That looks nice. Very nice.
Right around the range for the start of adj sight. If I had to be picky, I don't know about the checkered safety, I don't think they used them. The type lV mag catch appears to have been changed. He must have wanted to use a 30 round mag.

Is he still alive? Have you taken it apart? Curious as to the markings on the internals too. And the oiler and sling marking.