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MIL-M-45013E (AR)
(repeatability) is a measurement of the closeness together of a
series of measurements. For the purpose of this effort, the
precision will be defined as the standard deviation of the group
of data being analyzed.
4.4.4.3 Ammunition, links and bandoleers (see 6.2).
4.4.4.3.1 Ammunition. Unless otherwise specified in
procurement documents, the Government standard 7.62mm, M60 High-
Pressure Test Cartridge (MIL-C-46477) shall be used for the high
pressure resistance test; the 7.62mm, M80 Ball Cartridge (MIL-C-
46931) linked with the M13 Link (MIL-L-45403) shall be used for
all other firing tests; and the M172 Dummy Inert Loaded Cartridge
(MIL-D-60573) linked with the M13 Link shall be used as required
in the functioning firing test to separate belts of linked M80
Ball Cartridges.
4.4.4.3.2 Link. The Government standard 7.62mm, M13 Link
(MIL-L-45403) shall be used for linking ammunition required for
firing tests.
4.4.4.3.3 Bandoleer. The Government standard 7.62mm, M4
Bandoleer (MIL-B-60107) shall be used to contain the linked M80
Ball Cartridges on the machine gun as required for the firing
tests.
4.5 Methods of inspection.
4.5.1 Headspace test. Each machine gun with both its
assigned and spare barrel assembly with biped assembly shall be
gaged for headspace requirement (see 3.4.1) before and after high
pressure resistance firing, prior to acceptance, in accordance
with instructions specified on drawing 7274136 using the
inspection equipment conforming to drawing 7274515 and 7274459.
4.5.2 Firing pin indent test. Each sample machine gun with
d  and  spare  barrel  assembly  with  biped  assembly
shall be tested for firing pin indent requirement (see 3.4.2)
using the inspection equipment in accordance with drawing 7274381
and 7318984. The machine gun shall be cocked and then held in a
horizontal position with the cover assembly opened. The holding
fixture containing the copper compression cylinder (8440920)
shall be inserted unto the barrel chamber, the cover colosed, and
the trigger pulled to release the bolt and indent the copper
cylinder. The holding fixture shall be removed from the machine
gun and the depth of the indent in the copper cylinder computed
by measuring the distance from the original surface of the copper
cylinder (before indentation) to the bottom of the firing pin
impression.
28

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