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cartridge in the M16A1 rifles, it should only be used in a combat emergency, and then only for close ranges of 91.4 meters or less.

The M16A2 rifle with its 1:7 twist fires both types of ammunition with little difference in accuracy out to a range of 500 meters. The M16A2 and its ammunition are more effective at ranges out to and beyond 500 meters due to a better stabilization of the round.

The two 10-round shot groups in Figure F-15A were fired by a skilled marksman at a distance of 274.2 meters, using the same M16A1 rifle. The 25.4-cm shot group on the left was fired (and zeroed) with Ml93 ammunition. The 6-foot shot group on the right was fired after substituting M855 ammunition.

Figure F-15B shows two 25.4-cm shot groups fired by the same skilled marksman at a distance of 274.2 meters, using an M16A2 rifle. The shot group on the left was fired (and zeroed) with M855 ammunition. The shot group on the right was fired after substituting M193 ammunition.

NOTE: Both the M193 and M855 ball ammunition can be used in training and accurately function in the M16A2; however, do not substitute between the types during Firing. Do not zero with one type and then fire the other for any type of training. Due to the different characteristics of each round, be sure to zero with the same type ammunition that will be used for training. Figure F-15B illustrates how the group changcs when an M16A2 is zeroed with M855 ammunition but fires M193 ammunition. The reverse occurs if zeroed with M193 and fires M855.

A simple rule of thumb to use to preclude any problems is:

• When firing the M16A1 rifle, use only the ammunition specifically designed for (he rifle (M193 ball ammunition).

• When firing the M16A2 rifle, use the ammunition that was designed for the weapon (M855 ball ammunition).

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