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MIL-M-45013E (AR)
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 7.62mm, M80 Ball Cartridges (MIL-C-46931);
7.62mm, M13 Links (MIL-L-45403) and M4 Bandoleer (MIL-B-601O7)
without malfunctions or unserviceable parts and the cyclic rate
of fire shall be within 500 to 650 rounds per 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. 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 standard government 7.62mm, M80 Ball Cartridges
(MIL-C-46931) linked with M13 Links (MIL-L-45403) without
incurring more than three immediately clearable malfunctions and
the cyclic rate of fire shall be within the limits specified in
3,4,5. NO unserviceable parts, or uncontrolled fire are allowed.
No malfunctions which require disassembly of the machine gun or
in excess of one minute to correct are allowed. Malfunctions not
attributable to the machine gun, as substantiated by a contractor
failure analysis and acceptable to the Government, shall be
reported and shall not be chargeable. A malfunction is defined
as any unplanned cessation of firing or the inability to commence
firing. Testing shall be as specified in 4.4.3.5.
3.4.9 Reliability. The machine gun shall demonstrate a Mean
Round Between Stoppage (MRBS) of 1538 rounds and a Mean Round
Between Failure (MRBF) of 4444 rounds over a minimum receiver
service life of 50,000 rounds. Barrel life shall be 15,000
rounds minimum. Testing shall be in accordance with 4.4.3.6.
3.4.9.1 Mean round between stoppage. MRBS is determined by
dividing the total number of rounds fired by the total number of
stappages. A stoppage is defined as any unplanned cessation in
firing or the inability to commence or cease firing attributable
to the gun. All incidents shall be recorded and any considered
as not chargeable to the machine gun shall be substantiated by
the contractor.
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