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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.
9

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