To zero in the grenade launcher leaf sight, you should set up a target at 200 meters. Remember not to perform these procedures at ranges less than 100 meters. The 50-meter mark on the leaf sight blade is marked in red to emphasize that this range is not to be used in the zeroing-in procedures.

Be sure to perform the before-firing preventive maintenance services and the loading procedures as specified. Place the leaf sight blade of the weapon in the upright position. Choose your firing position, preferably a supported prone position. Align the target with the appropriate range increment of the leaf sight blade and the front post sight of the rifle. Fire the weapon, using the firing procedures given. Make any applicable windage or elevation adjustments.

NOTE

Turning the sight windage screw clockwise moves the leaf sight to the left. Raising the leaf sight increases the range, and lowering the leaf sight decreases the range.

When you must adjust for wind, each increment turn of the windage screw equals a 1 l/2-meter adjustment when you are firing on the 200-meter range. When you must adjust for elevation, each increment turn of the elevation adjustment machine screw equals a 10-meter adjustment when you are firing on the 200-meter range.

Fire three rounds and make the necessary adjustments after each round. When three consecutive rounds land within 5 to 10 meters of the target, the zeroing-in procedures are complete.

MISFIRE, HANGFIRE, AND STOPPAGE

A MISFIRE is a complete failure to fire because of a mechanical failure, not a delay in firing like a hangfire. It is not dangerous, but it must be treated as a hangfire (which is dangerous) until such possibility has been eliminated.

A HANGFIRE is a delay in the functioning of the propelling charge. Wait 30 seconds from the time the charge fails to fire before opening the breech for unloading procedures. Caution is required, as this can be very dangerous. Clear the area of all personnel not needed to correct the hangfire.

A STOPPAGE is any interruption in the cycle of operation caused by faulty action of the weapon or ammunition.

When a weapon fails to fire, the possibility of a misfire or hangfire exists. Therefore, the following precautions must be observed until the round has been removed from the weapon and the cause of the failure determined:

1. Keep the weapon trained on the target and be sure all personnel are clear of the muzzle.

2. Wait 30 seconds from the time the weapon fails to fire before opening the breech for unloading.

3. Exercise extreme caution during unloading procedures; where circumstances permit, either catch the ejected round or reduce the distance of free fall to the ground.

4. After the round has been removed from the receiver, store it separately until you determine whether the round or the firing mechanism is defective. If the round is defective, it must be kept separated from other rounds until it can be disposed of properly. If examination reveals that the firing mechanism is defective, the round may be reloaded and fired after the firing mechanism has been repaired by the armorer.