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MIL-R-63997B(AR)
REQUIREMENTS
3.
When specified, a sample shall be
3.1  First  article.
Unless
subjected  to  first  article  inspection  (see  4.4  and  6.1).
otherwise  specified  (see  6.1),  the  first  article  shall  include  the
pilot  pack  (see  5.1).
Rifles  and  parts  shall
3.2  Materials  and  construction.
conform  to  the  materials  and  construction  requirements  specified
herein,  on  Drawing  9349000  and  drawings  applicable  thereto,  and
be in accordance with the applicable materials and construction
provisions of MIL-w-13855.
3.3  Design.
Rifles and parts shall conform to the design
9349000 and drawings applicable
s p e c i f i e d  h e r e i nf o n  D r a w i n g
thereto, and be in accordance with the applicable design
provisions  of  MIL-W-13855.
T h e upper
Upper receiver and lower receiver qroups.
3.3.1
receiver group shall be attached to the lower receiver group by
the pivot pin and shall be held securely in the closed position by
When the takedown pin and pivot pin are
the takedown pin.
withdrawn  to  the  stop  position,  the  upper  receiver  group  shall
disassemble from the lower receiver group.
receiver qroup.
3.3.2
Lower
The hammer shall pivot on the hammer pin
3.3.2.1  Hammer.
through  its  full  range  of  travel  without  binding,  and  when  the
hammer is released from the cocked position, it shall pivot
forward  to  the  stop  position  under  spring  action.
The automatic sear shall be retained
3.3.2.2  Automatic  sear.
The automatic
in the lower receiver by the automatic sear pin.
sear  shall  move  through  its  full  range  of  travel  under  spring
tension without binding, and shall engage and restrain the hammer
w h e n t h e f i r e c o n t r o l s e l e c t o r i s i n t h e "BURST" position and the
The automatic sear shall
hammer is cocked by the bolt carrier.
restrain the hammer until the sear is tripped by the forward
motion  of  the  bolt  carrier.
The fire control shall have
3.3.2.3  Fire  control  selector.
three  positions; safe,  semi-automatic  and  burst  and  shall  rotate
manually  without  binding  from  one  position  to  another  when  the
The selector shall remain in place in each
h a m m e r is cocked.
position by perceptible spring detent load until manually reset
and shall be retained in the lower receiver by a spring loaded
detent.
With the hammer cocked, when the selector is placed in
the "SAFE" position, it  shall  prevent  the  trigger  from-releasing
When
the hammer so that the rifle is incapable of being fired.
3

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