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|  MIL-C-70724(AR)
APPENDIX C
50.4 Screen perforation with BFA. A paper sheet (4' x 4'
minimum) of type AA-203 40 pound kraft, Type I, wrapping paper
shall be stretched tightly over a rigid frame of the same size.
This target shall be placed perpendicular to the BFA orifice 15'
from the weapon. The screen shall be replaced as necessary to
facilitate observation. All perforations shall be noted.
50.5 Breech flash. During firing, the breech of all weapons
shall be observed for flash. Any occurrences shall be noted, as
well as the relative magnitude of each occurrence. The criteria
of Table IV applies.
50.6 Fouling.
Cleaning or lubrication of the barrel or any
part of the weapon is only permitted in between 500-round
segments, after observation for excessive fouling has been made.
Should excessive stoppages or malfunctions occur, the weapon shall
be examined for evidence of excessive propellant fouling or
excessive particle/shavings fouling as a possible cause. The
results of the examination shall be noted. The gas tubes of each
M16 or M231 series weapons shall be inspected for gas tube
fouling.
50.7 Cartridge ejection. Observe during function and
casualty.
A high speed camera shall be positioned so that the
angle at which the cartridges are ejected in the horizontal plane
can be determined. The preferred location for the camera is above
the weapon, viewing downward at the ejection port. The angle
shall be measured from an imaginary line which is drawn from the
front to the rear of the weapon, to an imaginary line defined by
the path of the ejected cases. The reference for the measurement
of the angle shall be as follows:
a. The rear of the weapon shall be designated as
O degrees.
b.
The muzzle of the weapon shall be designated as 180
degrees.
c. A straight line out of the center of the ejection port,
perpendicular to the weapon, shall be 90 degrees. High speed
photography in a darkened range shall be utilized to determine the
angle at which burning propellant will be ejected from the weapon.
A minimum of 150 rounds in each weapon will be filmed and
evaluated.
C-3
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