I added a cheap red dot and witnessed it with a Tru Glo front sight. fiber optic and tritium in case the battery dies, and sometimes just because. shot out to 100 yards this week with good results for a geezer and bifocals.
I needed a 3/4 inch riser to mount and witness the red dot. came together well and for what I intend this is as good as it will likely get at my age. really about as much fun as an old man can have with clothes on.