This sight rail sold by B-Square is worthless...I have tried to align it and secure it to the rifle with no success. I have taken it to a gunsmith and they have had the same problems. The screws are made of soft metal and strip very easily. The scope sits too high to bring it down with the usual scope adjustments...the closest I have been able to get is approx 8 inches high at 50 yds. Windage is fine.