5-21. This paragraph discusses the front and rear sights and their proper use.
Front Sight, M72A2 and M72A3 LAWs
5-22. The front sight has a raised vertical range line marked with ranges from 50 to 350 meters in 25-meter increments (Figure 5-11). Two curved stadia lines are etched on the front sights. Do not use the stadia lines on this sight to estimate range, because they are inaccurate. Lead indicators are located on either side of the stadia lines to help engage moving targets. On the M72A3, use the front sight illuminated range marks at the 100-meter and 150-meter points to help engage targets in low light.
Do not touch the range marks; they are illuminated with promethium, which is mildly radioactive.
Rear Sight, M72A2 and M72A3 LAWS
5-23. The rear sight consists of a steel bracket with a rubber boot and plastic peep sight. This sight automatically adjusts to changes in temperature (Figure 5-12), which means that its settings are unaffected by temperature.
5-24. This nightsight is issued with various accessories, including a bracket that, when mounted on an M72-series LAW, allows use of an AN/PVS-4 on the LAW. However, this works only if DS maintenance has already installed an M72A1 reticle in the AN/PVS-4. Though the reticle was developed for the M72A1 LAW, it can also be used with the other M72-series models. Use the following procedures to mount the M72A1 bracket assembly on any M72-series LAW:
• Place the bracket assembly on top of the rocket launcher so that the square cutout in the top of the bracket fits over the extension release button (Figure 5-13).
• Swing the lower adapter section up and under the rocket launcher and secure it by turning the locking latch clockwise to fully engage the latch shoulder screw.
• Place the sight in the groove on the bracket and align the threaded screw hole in the base of the sight with the lever screw assembly. Tighten the lever screw assembly firmly.
• Use the M72A1 reticle to estimate the range to a 20-foot target such as a tank viewed from the side (Figure 5-14). Place the sight so that the rear and front of a flanking target fit between the curved vertical lines (Figure 5-15). When you read the range from the scale, note that the width of the tank is about one-half the tank's length. This means you can estimate the range to a target, whether it is headed straight toward you or straight away from you, by placing its sides between the curved vertical lines and halving the range shown at that point. The bottom of each vertical line in the center of the reticle corresponds to an additional 25 meters. The length of a horizontal line represents 5 mils, and the spaces between lines represent 5 mils. Use the stadia lines to estimate range only when using the AN/PVS-4's M72A1 reticle pattern.
Figure 5-15. Using M72A1 stadia lines to engage targets.
• Align the nightsight's reticle pattern to the LAW sights only once. After that, you can move the nightsight from LAW to LAW without having to realign it each time (Figure 5-16, page 5-12). To align the sight reticle pattern to the LAW sights, place a target at 25 meters. Install the mounting bracket and sight, and select a stable firing position for the LAW. Turn both the TUBE BRIGHTNESS and RETICLE BRIGHTNESS knobs ON. Align the 200-meter range mark on the daysight with the aiming point on the target. Without moving the LAW, adjust the nightsight reticle so that its 200-meter range mark coincides with an aiming point 6.3 centimeters left and 3.5 centimeters above the target aiming point.
IF YOU CANNOT FIND AN EMPTY LAUNCHER TO USE TO ALIGN THE NIGHTSIGHT, YOU MAY USE AN UNFIRED LAUNCHER, BUT THIS IS EXTREMELY DANGEROUS.
operation and function
5-25. Before preparing the launcher for use, the firer inspects its overall condition. • To extend the rocket launcher —
■ Remove the pull pin and rotate the rear cover downward so the front cover and adjustable sling assembly can fall free (Figures 5-17 and 5-18). Do not discard the sling assembly until after you fire the rocket.
■ With your firing hand, grasp the rear sight cover and with your nonfiring hand, grasp the launcher forward of the barrel detent. Pull your hands sharply in opposite directions to extend the launcher (Figure 5-19). To ensure the launcher is fully extended and locked, try to close it (Figure 5-20, page 5-14).
To fire the rocket launcher, raise it slightly above shoulder level, rotate your body under it, and place it on your shoulder. Check the backblast area, pull the trigger arming handle to the ARM position, aim the launcher, and depress the rubber boot on the trigger bar firmly to ensure the launcher fires (Figure 5-21). If the trigger arming handle will not remain in the ARM position, the launcher is not fully extended. Pressing the trigger bar causes the firing pin to strike the primer, which ignites the black powder in the flash tube, which in turn ignites the propellant in the rocket motor.
WHEN OPERATING THE LAW, KEEP IT POINTED DOWNRANGE. ENSURE YOUR WHOLE BODY IS CLEAR OF THE MUZZLE AND REAR OF THE LAUNCHER, AND ENSURE THE BACKBLAST AREA IS CLEAR.
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