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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
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