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|  MIL-C-63990C (AR)
The acceptance and retest numbers of Table IV shall be
applied to the M249 results (all temperatures combined) and
the M16A2 results (all temperatures combined) individually.
All Function and Casualty defects observed in other
ballistic tests shall be included in both the M249 and M16A2
defect counts in the evaluation. When either weapon test is
failed and a retest is permitted by Table IV, both weapon
tests shall be repeated with sample sizes doubled. The
cumulative (lst and 2nd test combined) defect count shall be
evaluated against the cumulative acceptance criteria of
Table IV for both the M249 and M16A2 individually.
Three 30-round targets shall be fired. A retest is
permitted whereby the results of the first test are excluded
and six 30-round targets are fired, averaged and checked for
compliance with the requirements. Only one target miss is
permitted out of all "Valid Targets" as defined in SCATP-
5.56mm (Heavy Bullet).
The sample for this test shall be the sample specified for
the Function and Casualty test for each respective weapon,
i.e., 800 rounds for the M249 and 800 rounds for the M16A2.
Four separate tests shall be conducted: M16A2 Day, M16A2
Night, M249 Day, and M249 Night. Each individual test must
meet 100-20-36. Each individual test is permitted a 100-
round retest whereby the accept/reject criteria for the
cumulative sample of 200 rounds is 200-35-36. Trace
signatures identified as dim at the 2950 ft observation
point shall not be scored as defects.
The two hundred round sample shall be composed of the
following:
One hundred rounds from the M249 Function and
a.
Casualty test.
Sixty rounds from the M16A2 Function and Casualty
b.
test : 3 round burst mode.
Forty rounds from the M16A2 Function and Casualty
c.
test: single shot mode.
Failure of four or more bullets (from the total sample) to
comply with the applicable requirements shall be cause for
rejection of the lot. If more than one but less four
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