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|  MIL-S-70538A (AR)
4.7.4 Drop test. A linked belt of 200 M857 or M232 inert
cartridges with feedstrap attached shall be loaded into a
magazine and the cover attached. The assembly shall be dropped
onto solid concrete three times in the folowing orientations:
once on the cover edge designated as 3-4, once on the cover
corner designated as 2, and once on the corner opposite the cover
designated as 7. See drawing 9349672 for designation of these
drop locations. Drop height shall be 12 inches in all cases.
The assembly must comply with the stated requirement for the test
results to be acceptable.
4.7.5 Function firing. Each magazine shall be loaded with
a linked belt of 200 Government approved M855 ball and M856
tracer cartridges with Government approved M27 links and a
feedstrap attached. The cover shall be assembled to the magazine
and the assembly shall be temperature conditioned as required in
Section 3. Each magazine shall be fired using a M249 machine gun
in bursts of 5-7 rounds at a rate of 85 shots per minute. Prior
to firing the last 50 cartridges, the weapon feed cover shall be
released and the free length of cartridges allowed, if possible,
to fall back into the magazine. After functioning, the magazine
shall be detached from the weapon. The weapon barrel shall be
cooled to ambient following the firing of each 200 round group.
The assembly must comply with the stated requirement for the test
results to be acceptable.
4.7.6 Temperature extremes. Tests and examinations shall
be performed in the same manner as for ambient conditions with
all of the following modifications.
a. All magazines, covers, feedstraps and linked
cartridges shall be temperature conditioned as an assembly at the
specified temperature for a minimum of two hours before the start
of testing.
b. Testing shall be performed immediately upon removal
of the conditioned items from the conditioning box. A delay of
more than two minutes is unacceptable and shall require
reconditioning for 30 minutes. Immediately after each test or
examination. The item shall be returned to the conditioning box
so that it will remain temperature conditioned for the next test
to be performed on it.
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