MIL-DTL-71026A(AR)
4.5
Methods of verification.
4.5.1
Function firing.
4.5.1.1 Functioning. The magazine shall be loaded with a
linked belt of 100 rounds of M855 ball, per MIL-C-63989, and M856
tracer, per MIL-C-63990, cartridges (4 ball to 1 tracer) linked
with M27 links, per MIL-L-63532 (DWG. 11691287) and a feedstrap
attached. The machine gun shall be fired in 5-7 round bursts at
a rate of 85 rounds per minute. After firing between 60 and 80
cartridges, the weapon feed cover shall be released. The belt
shall be checked to see if any rounds fell back into the
magazine. To be acceptable no rounds shall have fallen back into
the magazine. The firing shall then be resumed. Upon completion
of the functioning test the magazine shall be detached from the
weapon and the spring, retention, belt shall be checked that it
is properly seated and not loose.
4.5.1.2 Endurance (ambient temperature). Each magazine
shall be loaded with a linked belt of 100 Government approved
M855 ball and M856 tracer cartridges (4 ball to 1 tracer) with
Government approved M27 links and a feedstrap attached; and
placed in a temperature chamber and conditioned to the
temperature required in Section 3. Each magazine shall be
subjected to fifty (50) firing cycles; The firing cycles shall be
distributed (17, 17, 16) among 3 different weapons. The machine
gun shall be fired in 5-7 round bursts at a rate of 85 rounds per
minute. The weapon barrel shall be cooled to ambient following
the firing of each 100 round group.
4.5.1.3 Endurance (temperature extremes). The magazine
shall be loaded with a linked belt of 100 Government approved
M855 ball and M856 tracer cartridges (4 ball to 1 tracer) with
Government approved M27 links and a feedstrap attached. The
magazine shall be temperature conditioned in accordance with
4.5.6. The magazine shall be subjected to five cycles. The
magazine shall meet the test conditions of 4.5.6 for the entire
test. The machine gun shall be fired in 5-7 round bursts at a
rate of 85 rounds per minute.
4.5.2 Dovetail mount. A linked belt of 100 M857 or M232
inert cartridges shall be loaded into a magazine. The dovetail
shall be lubricated generously with "Break Free CLP" lubricant,
MIL-PRF-63460, and the container attached to the test fixture
(see Figure 1). The dovetail shall be examined for proper fit
(interface requirement). A 2.27 Kilogram weight minimum shall be
dropped from a minimum height of 305 millimeters onto the
magazine 30 millimeters away from the dovetail (directly opposite
from the dovetail). The magazine must remain attached to the
fixture for the test result to be acceptable. The test fixture
(see Figure 1) shall use a weapon mount representing the minimum
material (loosest) condition of drawing 9348215 feed box support
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