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MIL-R-63997B(AR)
All items preceded by a double asterisk (**) shall be
Note:
Parts in-
replaced  during  interchangeability  test.
advertently damaged during interchange may be replaced
without penalty when authorized and verified by the government
representative  witnessing  the  test.
The  interchangeability
4.7.7.1.2 Concurrent repair parts.
test  for  concurrent  repair  parts  shall  be  conducted  during
The  five  rifles
inspection  lot  test  in  accordance  with  TABLE  IV.
used  for  the  repair  parts  interchangeability  test  shall  have  met
the  test  requirements  of  TABLE  III,  firing  pin  indent  test  (see
4.7.2) and the classification of defects (see 4.5.2.2.3) shall be
disassembled as required and reassembled using the concurrent
No hand refinement of parts shall be permitted
repair  parts.
A  function  firing  test  (including
during  interchange  of  parts.
cyclic rate of fire) specified in test method 4.7.5 shall be
performed on the reassembled rifles when the following repair
parts  are  interchanged.
Compensator (9349051).
Receiver - Upper (9349063).
Clutch  Spring  (9349109).
Magazine Catch Spring
Burst Cam (9349108).
(8448637).
Hammer & Hammer Pin Retainer
Trigger  (9390736).
Assy  (9349110).
Bolt  (8448510).  &  re-
Ejector  &  Safety  Detent  Spring
m a a i n i n g p a r t s=
(8448516).
Trigger Spring (8448593).
T r i g g e r & Hammer Pin (8448609)
Magazine Catch (8448638).
(2) l
Ejector  (8448515).
Spring  Disconnect  (9349116)  (2).
G a s Tube Assy (8448567).
Bolt Cam Pin [8448502).
Bolt  Catch  Plunger  (8448634).
Bolt  Catch  (8448628).
Barrel & Front Sight Assy
Buffer Assembly (8448615).
(9349124) & remaining parts.
Firing  Pin  (8448503).
Extractor  Pin  (8448513).
Bolt Catch Spring (8448633).
Semi Disconnect (9349114).
H a m m e r  Spring  (9349107).
Burst  Disconnect  (9349113).
Fire  Control  Selector  (848630).
Key (8448506).
Extractor (8448512) w/Spring
A S S y  (8448755).
Automatic  Sear  Assy  (8448595).
Action  Spring  (8448629).
Bolt  carrier  (8448507).
The  rifles  subjected  to  interplant
4.7.7.2  Interplant.
interchangeability test (see TABLE IV) shall be given a
preliminary  hand  functioning  to  assure  proper  operation  before
parts  are  disassembled  from  the  rifle.The  rifles  shall  be  tested
for  headspace,  firing  pin  indent,trigger  pull,  functioning  and
accuracy requirements before and after interchange of parts, using
the  test  methods  specified  in  4.7.1,  4.7.2,  4.7.3.4.7.5  and  4.7.6
45

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