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|  MIL-R-63997B(AR)
3.4.5 Functioning.
Each rifle shall operate without
malfunctions or unserviceable parts.
The cyclic rate of fire for
3 rounds of burst firing using-a 30 round magazine shall be within
700 to 900 rounds per minute when firing M855, 5.56mm ball
cartridges conforming to Drawing 9342868 and specification
MIL-C-63989.
Testing shall be as specified in 4.5.3.1, TABLE III.
3.4.6 Targetinq and accuracy.
A series of 10 rounds fired
from each rifle at a range of either 91.4 meters or 45.7 meters
shall be within the extreme spread and targeting area (heavy
outline) specified in Figure I when front and rear sights are set
as follows.
The normal rear sight peep (sight rotated fully
rearward) shall be used with the rear sight set centrally in the
slot for windage within plus or minus five (5) clicks.
The top
edge of the front sight post flange shall be set flush to .030
inch below the bottom surface of the front sight slot.
Maximum
utilization shall be made of the 91.4 meter range.
Ammunition
shall be Government standard M855, 5.56mm ball cartridges
conforming to Drawing 9342868, and shall have been certified by
the Government to be of a quality that will group within a mean
radius of 1.2 to 1.4 inches at 200 yards as measured in accordance
with MIL-C-9963.
Testing shall be as specified in 4.5.3.1, TABLE
III.
3.4.7 Endurance.
Rifles shall be capable of withstanding the
firing of 6,O00 rounds for endurance witg not more than the number
of malfunctions and unserviceable parts allowed for both single
rifle and four rifles combined as allowed in TABLE I.
The cyclic
rate of fire of not more than one reading on a single rifle or not
more than two readings on four rifles combined, shall fall outside
of 700 to 940 rounds per minute.
Ammunition used shall be
Government standard M855, 5.56mm ball cartridges conforming to
Drawing 9342868.
Testing shall be as specified in 4.5.3.1, TABLE
IV.
3.5 Interchangeability.
Unless otherwise specified on the
drawings, all parts shall be interchangeable.
Testing shall be as
specified in 4.5.3.1, TABLE IV.
3.6 Marking.
Each rifle shall be clearly marked in
accordance with the applicable drawings and MIL-W-13855.
3.7 Workmanship.
Workmanship shall be in accordance with
workmanship requirements of MIL-W-13855.
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