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MIL-C-70725A (AR)
Using an M16Al Rifle with an
4.6.12 Hot chamber effects.
M2 training bolt, fire 120 rounds in 30-round bursts, changing
magazines as quickly as possible.  The last round shall be
chambered but not fired.  The maximum time allowed for the firing
of 120 rounds shall be two minutes.  If the round fires (cooks-
off), the time shall be recorded.  After 25 minutes the weapon
shall be cleared by either manually ejecting or firing the
cartridge.  Failure to readily clear the gun shall be cause for
rejection.  If 120 rounds cannot be fired in two minutes, the
weapon shall be cooled, and the test shall be repeated.
Test in accordance with
4.6.13 Chemical compatibility.
Appendix D.
4.6.14 Bullet integrity.  Observe for bullet integrity
during function and casualty (see Appendix C, 50.4).
4.6.15 Ricochet.  The test shall be performed using both
the M16A1 and M16A2 rifles with M2 training bolts, fired from a
rigid test mount.  The following target materials shall be
evaluated:
Plywood - 1/2 inch thick
a.
b.
Concrete block wall
Steel plate - 1/4 inch thick
c.
Each target shall be a minimum of 1 meter wide x 2 meters high.
The point of impact of the target shall be 5 meters from the
muzzle of the weapon.  The target shall be capable of being
maneuvered to obtain target obliquities of 0 to 30 (0 repre-
senting the condition where the target is perpendicular to the
line of fire).  A Kraft paper witness screen shall be placed at
the muzzle of the weapon, perpendicular to the line of fire.  The
purpose of the witness screen is to determine if bullets or
fragments of bullets will ricochet back into an area where
gunners might be located in a typical training scenario. The
witness screen shall be a minimum of 10 meters wide x 2-1/2
meters high and shall be located on ground level.  The screen
will be situated so that there will be 8 meters of paper to the
side of the weapon that will indicate ricochets when target
obliquity is greater than zero.  All firings shall be performed
remotely in a single shot mode.  The cartridges shall be fired at
each target type at 0, 15 and 30 target obliquities.  Equal
quantities of test cartridges shall be fired at each target
material and at each obliquity angle from the weapon.  The screen
shall be inspected for perforations following each shot. The
occurrence of any perforations greater than 1/10 inch caused by
37

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