Zero and M16A2 Rifle
Zero an M16A2 Rifle
CONDITIONS- On a 25-meter range, given an M16A2 rifle, 18 rounds of 5.56-mm ammunition, a 300-meter zero target, and sandbags for support.
STANDARDS- Using 18 rounds or less, the soldier must battlesight zero his rifle by achieving five out of six rounds in two consecutive shot groups within the 4-centimeter circle. Bullets that break the line of the 4-centimeter circle will be used in evaluating the soldier's performance.
TRAINING AND EVALUATION-
1. The M16A2 rifle has two adjustable sights -- front and rear. Elevation adjustments are made using the front sight, and elevation changes and windage adjustments are made using the rear sight.
2. The sight systems.
a. The rear sight has an elevation knob with range indicators from 300 to 800 meters and two apertures for range. One aperture is marked 0-2 for short range from 0-200 meters and an unmarked aperture for normal range from 300 to 800 meters.
(1) The 0-2 (large) aperture is used
for short range (Figure 107). This
aperture is used only when the rear sight
is all the way down. The 8/3
(300-meter) mark on the elevation knob is
aligned with the index mark on the left
side of the receiver.
b. The rear sight also consists of a windage knob on the rear side of the sight (Figure 109).
(1) Each click of the windage knob
will move the strike on the round from 1/8
inch (.3 centimeters) at 25 meters to 4
inches (10 centimeters) at 800 meters.
c. The front sight consists of a rotating sight post with a spring-loaded detent (Figure 110).
3. Sight adjustments.
a. Rear sight.
b. Front sight. To adjust elevation, depress the detent and rotate the sight post (Figure 111). To raise the strike of the round, rotate the sight post in the direction of the arrow marked UP. Reverse the direction of rotation to lower the strike.
4. Zero the rifle. The following steps will establish a zero at 25 meters, your M16A2 rifle sights will be set with a 300-meter battlesight zero.
a. Establish mechanical zero on the rifle.
b. Zero at 25 meters.
(1) After setting the front and rear sights to mechanical zero, the elevation knob is rotated up (clockwise) one click past the 8/3 (300-meter) mark. The elevation knob will remain in this position until the battlesight zeroing has been completed.
NOTE: Any changes in elevation required during the zeroing procedures will be made using the front sight post only.
(2) Carefully aim and fire each shot
of a three-shot group at the circle on the
silhouette (Figure 112).
NOTE: The squares are numbered around the edges of the target to equal the number of clicks required to move the shot group to the circle.
(4) To raise your next shot group,
rotate the front sight post UP (clockwise).
To lower your next shot group, rotate the
front sight post DOWN (counterclockwise).
One click will move the strike of the round
one square on the target.
1. There are clicks between the
range numbers as you turn the elevation
knob. Use these clicks if you need
more elevation past a certain range number
to hit a target.
5. Sight setting. your rifle sights should be kept set to a combat zero of 300 meters. If you are told to engage a target at a longer range; for example, 500 meters:
NOTE: When the rifle has been zeroed to 300 meters, all other ranges on the elevation knob are also zeroed.