MIL-DTL-001298D (AR)
of the total monthly production rounded up to the next higher whole number, whichever is
greater (see 6.11).
4.13 Cyclic rate of fire. Each M2 shall be tested for cyclic rate of fire using test fixture
Drawing 8440929 or approved equivalent. This test may be performed concurrently with the
25 round continuous fire burst described in paragraph 4.11. Record the cyclic rate of fire of
each M2.
4.14 Targeting and accuracy.
4.14.1 Targeting and accuracy test M2 Caliber .50 Heavy Machine Gun, Flexible. The
M2 Caliber .50 Heavy Machine Gun, Flexible shall be mounted in a firing fixture conforming
to Drawing 8440929 or an approved equivalent. With the leaf of the rear sight in the folded-
down position and the windage scale adjusted to zero, the sights shall be aligned at 6 o'clock
on the sighting image of the targeting and accuracy diagram 7266955 made with target paper,
at a range of 100 feet, fire a 10 round continuous burst.
4.14.2 Accuracy test M2 Caliber .50 Heavy Machine Gun, Turret Type (M48 Series).
With the weapon bore sighted on the point of aim on the sighting image of a target meeting the
requirements of Drawing 7266955 made with target paper, at a range of 100 feet, fire a 10
round continuous burst.
4.15 Endurance. One M2 from each lot shall be tested, after having been found to be
satisfactory in all tests 4.4 - 4.14. The M2 shall be mounted in a firing fixture conforming to
Drawing 8440929 or an approved equivalent. The test shall be started with left hand feed and
the direction of feed shall be changed every 1000 rounds. The firing schedule shall be 50
rounds in interrupted bursts followed by a 50 round continuous burst. The barrel shall be air
cooled to ambient temperature after each 100 rounds fired. The ammunition may be linked in
50 round belts or in 100 round belts with a dummy inert round separating each 50 rounds.
During the interrupted burst firing, the bolt latch release (if applicable) shall be released at
least twice to stop the firing and the trigger shall be released at least three times to stop firing.
The average cyclic rate of fire for 25 rounds shall be measured and recorded during the first 50
round continuous burst of each 1000 rounds. The average muzzle velocity of 10 consecutive
rounds shall be determined during the first 50 rounds fired, during, 4900-5100 rounds fired and
during 9900-10,000 rounds fired. Ten rounds may be fired for warm-up before the velocity is
measured. For maintenance schedule (see 6.5).
4.15.1 Endurance retest. If the M2 representing any lot fails to meet the specified
requirements in the test, a retest shall be performed. For the retest, another M2 shall be
selected from the retest lot under consideration. However, if the failure indicates defects in the
M2, a retest shall be performed only if authorized by the procuring agency. If a retest is not
performed or the M2 selected fails in the retest, the lot shall be rejected subject to conditioning
and further testing.
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