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Firing pin indent and trigger pull testing |
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|  MIL-R-45979
4 . 5 . 1 0 . 5 F i r i n g pin indent and trigger pull testing. A sample of
t e n rifles shall be selected from each lot and tested for firing pin
i n d e n t (see 3.3.1) and trigger pull (see 3.3.2) using the test methods
s p e c i f i e d in 4.6.4 and 4.6.5 respectively. Failure of any rifle in the
sample to meet the requirements shall cause rejection of the represented
lot.
4 . 5 . 1 0 . 6 High-pressure resistance, functioning, and targeting and
a c c u r a c y firing testing. E a c h rifle shall be tested for high-pressure
r e s i s t a n c e (see 3.3.3), f u n c t i o n i n g (see 3.3.4), and targeting and
accuracy (see 3.3.5) using the test methods specified in 4.6.6 and 4.6.7
r e s p e c t i v e l y . R i f l e s failing to meet the requirements shall be rejected.
4 . 5 . 1 1 Inspection for acceptance. T h e contractor shall perform
inspection for acceptance upon completion of all manufacturing and in-
p r o c e s s inspection operations, prior to preservation and packing. In-
s p e c t i o n for acceptance shall include, but is not limited to, inspection
f o r workmanship, protective finish, missing features (missing operations),
c h a r a c t e r i s t i c s not previously inspected, and characteristics that may
have been altered or changed as a result of subsequent operations after
p r i o r inspections were completed.
4 . 5 . 1 2 Inspection of packaging. U n l e s s otherwise specified (see
6 . 1 ) , inspection to determine compliance with preservation, packing and
marking requirements of the applicable packaging documentation, for the
l e v e l designated in the contract, shall be as specified in MIL-P-14232.
4.6 Test methods..
4 . 6 . 1 Soundness of weld test. M a g n e t i c particle inspection for
soundness of weld (see 4.5.10.2) shall be Performed in accordance with
M I L - I - 6 8 6 8 . Magnetization shall be by the-continuous process using the
c i r c u l a r and longitudinal methods. The longitudinal method shall be
a c c o m p l i s h e d using a standard five turn magnetizing coil.
Inspection
shall be by the wet process using a fluorescent suspension. When
m a g n e t i c particle inspection is to be performed on barrel and receiver
assemblies, the current magnitude shall be 800 to 1200 amperes. When
m a g n e t i c particle inspection is to be performed on receivers, the current
magnitude shall be 400 to 500 amperes.
4 . 6 . 2 Tightness of draw test. The barrel and receiver assemblies
s h a l l be tested for tightness of draw (see 4.5.1O.3) using inspection
equipment in accordance with Drawing F7271792. The barrel and receiver
h o l d i n g fixtures shall be secured to a bench or other suitable surface.
The barrel and receiver assembly shall then be secured in the fixture as
s p e c i f i e d on the applicable drawing and torque applied to the receiver
i n the direction to disassemble it from the barrel.
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