As you might recall my newly purchased Mosin was shooting high at 50
yards. The rear sight was down all the way and the front sight is not
readily adjustable. Last night I filed a deeper notch in the rear
sight and glued a small strip of orange plastic to the post in the
front sight which increased its height.

Shot about 40 rounds at the range this morning. The deeper notch in
the rear sight is a definite improvement and was easy to do. It
results in a much clearer sight picture and lowers the point of
impact. Unfortunately the orange plastic post extension on the front
sight has some drawbacks. It was highly visible but also tended to
obfuscate the sight picture leading to inconsistent shot grouping.
With the plastic removed, windage seems to be right on the money.
Shots grouped vertically over about 4 inches. Three shots grouped
within an inch just above the bullseye. If I could do that
consistently I'd call everything good - maybe with a bit more
practice.