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MOJO makes a quick rear peep sight for the SKS... an alternative to the dremel. I would use a triangular file myself to prevent cutting one side more than the other which would lead to having to drift the front sight over... dremel is just too fast for that kind of work.
Or ......use magnifying glass just in front of the rear sight , or...... don't use the sights at all , they are useless on SKS anyway , the bullets go wherever they want ...........just keep pulling the trigger.
I did a bit of filing on this one with a small triangular V file, I liked the sight picture and will eventually do something similar to my other two, not sure if I will go the V notch or just widen the square one.