I used a Dawson Precision fiber optic front sight. I heated the red fiber optic rod up and swelled it out bigger so it made a big red dot. But I failed to measure the old front sight and my newly installed front sight was to tall. I had a new rear factory Novak sight for my 4566 laying around which was taller. So installed it and it was perfect. Dead on in my 7-15 yard shooting .