See Review From Jeff of MO Dated May 25 2019. I posted that review. As an update, I have since reworked the rear sight and after about an hour of grinding, filing, honing, etc, I was finally able to get the rear sight to work with the adjustment screw. Be advised that the front sight provided with this set is the same height as the tall front sight supplied with the CCP M2. I finally gave up on these sights as I need the short sight to get point-of-aim and point-of-impact to match at 25 yards. Just too much work to make these a viable solution in my situation. I went back to the stock sights so as to not shoot 4" low at 25 yards. I still want night sights, but not at the cost of accuracy. Your mileage may vary.