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|  MIL-C-63990C (AR)
3.13 Fouling. The fouling accumulated in the M16A2 and
M249 weapons during the firing of sample cartridges shall not
cause failure of either weapon to function.
3.14 Bullet integrity. The bullet of the cartridge shall
not burst either in its passage through the barrel or in flight;
neither shall the jacket of the bullet nor any part thereof strip
from the other bullet components when the cartridge is fired.
3.15 Action time. The mean action time plus five standard
deviations shall not exceed 3 milliseconds. Action time is
defined as the sum of the primer ignition time, propellant
burning time, and the time taken by the bullet to reach the gas
port.
3.16 Airtightness of base closure seal. The bullet shall
not release more than one bubble of air when subjected to an
internal pressure differential of two pounds per square inch
(psi) for 5 seconds.
3.17 First article. When specified in the contract or
purchase order (see 6.2), a sample shall be subjected to first
article inspection in accordance with the technical provisions
herein (see 4.4) .
3.18 Workmanship. The requirements for workmanship shall
be as specified on applicable drawings, referenced specifications
and in accordance with the following:
The cartridge shall be free of
a. Metal defects
metal defects which include: but are not limited to: folds,
wrinkles, scratches, scaly metal, dents, perforations, and other
discontinuities.
b. Foreign matter. The cartridge shall be free of
corrosion, stains, discolorations, dirt, and smears of lacquer.
c. Cleaning. Cleaning methods used shall not be
injurious to any part, nor shall the parts be contaminated by any
cleaning agent.
d. Contamination of exp losive components. Extreme
care shall be exercised to avoid contamination of primers and
propellant by oil, grease, or other foreign matter.
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