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|  MIL-C-70725A (AR)
b. The reliability at either +85 or -85 does not
degrade by more than 0.10 from the reliability at 0 for both
weapons.
4.6.20 Maximum range The maximum range test shall be
conducted with test ammunition conditioned at the temperature
which has yielded the greatest average muzzle velocity as
determined in the velocity section of the Qualification test.
The test shall be performed using both the M16A1 and M16A2 rifles
equipped with M2 training bolts, fired from a test fixture
capable of firing both weapons at various angles of muzzle
elevation from O degrees to 45 degrees. The test shall be
conducted in a location where the impact area is a clean flat
surface such that projectile ground impacts can be readily seen,
such as an airfield runway or a flat sand or dirt covered area.
There should be a protected shelter down range where observers
will be able to witness ground impacts. The test shall not be
conducted when the wind velocity is greater than 5 mph in any
direction.
For each weapon, the test shall be conducted at quadrant
elevations from O to 45 degrees above the horizontal. Fifteen
shots shall be fired, in fifteen-round bursts, at each 5-degree
increment from O to 45 degrees. After each burst, observers down
range will note where the projectiles impact the ground. and will
measure and record the distance to the muzzle of the weapon.
Each 15-round burst shall be considered valid if a minimum of 12
rounds are discovered. If less than 12 rounds are found, that
15-round burst shall be repeated. A determination shall then be
made as to what 10-degree elevation band is most likely to
provide the maximum range. Once this band has been identified, a
30-round burst shall be fired at each 1-degree increment within
that band. After each burst, the observer(s) shall locate the
bullets and shall measure the distance from the impact location
to the muzzle of the weapon. For each 30-round burst fired, the
results shall be considered valid if a minimum of 25 projectiles
are found. If less than 25 are found, that 30-round burst shall
be repeated. The mean distance plus 3 standard deviations shall
be calculated for each 30-round shot group, at each 1-degree
increment. The greatest of these mean distances plus 3 standard
deviations is the maximum range for the sample cartridge.
For each of the 30 rounds fired at the angle which gives the
maximum range, the distance from the ground impact location to
the line of fire in a perpendicular direction shall be measured.
Each shot must fall within a fan of safety defined as the area
bounded by two lines, 5 to the left and 5 to the right of the
line of fire.
40
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