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MIL-M-45945A
3.4 Performance
characteristics.
3.4.1 Headspace.  The headspace in the assembled machine gun
(see dwg 11699750) shall not be less than 1.6315 inch and not
more than 1.6365 inch when measured to the 0.400 diameter datum
Testing
on the first shoulder of the chamber (see dwg 7269028) .
shall be as specified in 4.4.3.1.
3.4.2  Firing  Pin  ident. The firing pin indent shall be
0.030 inch minimum and shall not be off center more than one-half
the diameter of the firing pin indent (see 11699750). Testing
shall be as specified in 4.4.3.2.
3.4.3 Trigger  pull.  The  trigger  pull  (see  11699750)  shall
be greater than 10 pounds but shall not exceed 20 pounds.
Testing shall be as specified in 4.4.3.2.
3.4.4 High  pressure  resistance.  Every  barrel  assembly  with
biped assembly, 7269028 and bolt, 11010358 supplied as a repair
part, spare part or as an end item's component shall be subjected
to a high pressure resistance tests as specified on their
respective drawings. Each of these components shall be capable
of withstanding the firing of one standard 7.62mm M60 High
pressure Test Cartridges (MIL-C-46477) . After firing, all
components proof tested shall be free of cracks, seams, and
defects. Testing shall be as specified in 4.4.3.3.
3.4.5  Functioning.  The  machine  gun  shall  operate  with
Government  standard  7.62m,  M80  Ball  Cartridges  (MIL-C-46931)
7.62mm, M13 Links (MIL-L-45403) and without malfunctions or
unserviceable parts and the cyclic rate of fire shall be within
500  to  650  rounds  minute.  Testing  shall  be  as  specified  in
4.4.3.3.
3.4.6 Targeting  and  accuracy.  Using  Government  standard
-
7.62mm, M80 Ball Cartridges (MIl-C-46931) and 7.62mm, M13 Links
(MIL-L-45403), nine rounds of a 10 round burst fired from the
machine gun at a range of 100 yards shall be within the extreme
spread and targeting area specified on dwg 7269214 or 7269414.
Testing shall be as specified in 4.4.3.3.
3.4.7 Interchangeability.  Unless otherwise specified on the
drawings, all parts shall be interchangeable. Testing shall be
as specified in 4.4.3.4.
3.4.8 Endurance.  Machine guns shall be capable of firing
10,000 rounds of Government standard 7.62mm, M80 Ball Cartridges
(MIL-C-46931) linked with M13 Links (MIL-L-45403) without
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