U.S. Army Iron Sight Zero

NOTE: The threshold (minimum) grouping standard is 6 minutes of angle (4 centimeters/1.5 inches at 25 meters). The ideal grouping standard is 4 minutes of angle (2.5 centimeters/1 inch at 25 meters).

An overview of how to zero an iron sight rifle based on the U.S. Army Table IV procedures. While optics are most common, some Soldiers only have iron sights available.