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|  MIL-S-45921A(AR)
4.6.3 Shock resistance test. The stock assembly shall be
assembled as a component of the M14 rifle and tested for the shock
resistance requirement (see 3.2.5). The rifle shall be. equipped
with the M76 grenade launcher. The rifle shall be placed in a
fixture so that the support will be at the toe of the butt and at
45 degrees with the longitudinal axis of the rifle- The screw
driver slot in the gas cut-off valve of the rifle shall be in a
position parallel to the barrel, so that the valve prevents the
gas from entering the gas cylinder. Five Government standard
practice anti-tank grenades shall be launched using Government
standard 7.62mm, M64 grenade cartridges. The stock assembly shall
be disassembled from the rifle and examined to determine if the
requirement has been met.
4.6.4 Functioning firing test. The stock assembly shall be
assembled-as-a component of the M14 rifle and tested for
functioning requirement (see 3.2.6), with the rifle held in a
firing stand simulating shoulder firing and conforming to Drawing
The rifle shall be function fired as follows using ball
F7273901.
cartridges: 5 rounds semiautomatic (selector set with the blank
face to the rear); 15 rounds automatic (selector set with the
letter "A" facing to the rear) in bursts of approximately 5 rounds
each; and 20 rounds automatic in one burst. All firing in this
test shall be performed with fully loaded magazines and using
Government standard 7.62mm, M59 or M80 ball cartridges.
4.6.5 Targetinq and accuracy test. The stock assembly
shall be tested for targeting and accuracy requirement (see 3.2.7)
using the following method.
One rifle shall
4.6.5.1 Tarqeting and accuracy procedure.
be fired for targeting and accuracy with each of 40 stock
assemblies of the first article sample assembled as a component of
the rifle. The rifle shall be held in a targeting jack simulating
shoulder firing and conforming to Drawing F6511841. The rear
sight shall be set at zero windage, the aperature elevated eight
clicks from the lower position, and the rifle sights aligned at 6
o'clock on the sighting image specified on the targeting and
accuracy diagram, Drawing C11686842. One ten shot target shall be
fired with each stock assembly in accordance with rifle testing
procedures, specified in MIL-R-45012, to compare the targeting and
accuracy capability of the 40 plastic stocks with 40 wooden stocks
which have been determined to be satisfactory. The targeting and
accuracy results shall be compared to determine whether the
requirements of 3.2.7 have been met.
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