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|  MIL-M-45013E (AR)
the sights aligned at 6 o'clock on the sighting image of the
targeting and accuracy diagram, a 10-round burst shall be fired
for the targeting and accuracy measurement. The barrel assembly
with biped assembly shall be replaced by the spare barrel
assembly with biped assembly and with a 6 o'clock hold on the
sighting image of a new target, a 10-round burst shall be fired
for the targeting and accuracy requirements. Adjustment of the
sights may be made within the limitations of 4.5.6.3 to bring the
two barrels within the targeting requirements with the same sight
setting. A 3-round warmup burst is allowable when testing each
barrel assembly with biped assembly.
4.5.6.3 Rear siqht. Adjustment to the rear sight shall not
cause overhanging of the rear sight base. Vertical adjustment
shall be made by movement of the adjustable elevation scale and,
after adjustment, determination shall be made that the required
additional adjustment is available (see 3.4.6) . Filing of the
top of the front sight base shall be allowed to correct for
vertical deviation provided that resulting bright areas are
covered with an approved touch-up paint or coating.
4.5.6.4 Rear sight base. Upon satisfactory completion of
the targeting and accuracy firing test, the rear sight base shall
be staked in place and the adjustable elevation scale shall be
set at the correct scale graduation.
4.5.7
Interchange
of
parts.
4.5.7.1
In
plant.
4.5.7.1.1 Machine guns. Machine guns shall be tested for
interchange of parts (see 3.4.7) by disassembling and then
reassembling parts using the parts and prearranged system
prescribed below in Table II. Interchange of parts shall be
accomplished by dividing the parts of each Machine gun into 10
groups of nonmating parts as shown below and distributing the
groups into 10 different trays until each tray contains a
complete machine gun. Groups os parts from machine gun number 1
shall be taken in order and placed in trays 1 through 10; groups
of parts from machine gun number 2 shall be taken in order and
placed in trays 2 through 10 to 1; groups of parts from machine
gun 3 shall be taken in order and placed in trays 3 through 10 to
2; etc. Commercial parts such as screws, nuts, washers, and pins
shall be placed in the same tray as their mating or associate
part. Any commercial part rendered unserviceable or disassembly
shall be replaced without penalty to the interchangeability test.
The machine guns shall be reassembled using only those parts
which are in the same tray.
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