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|  MIL-S-63348A(AR)
4.7 Test methods.
4.7.1 Headspace test. This test shall be performed during
individual weapon testing in accordance with Table III using
Government approved gages.
4.7.1.1 Minimum headspace. The bolt shall be moved rearward to
the open position. The minimum headspace gage shall be inserted in
the chamber and the bolt shall be returned to the battery position.
Only finger pressure shall be applied to close the bolt. TO be
acceptable the bolt shall fully close.
4.7.1.2 Maximum headspace. The bolt shall then be retracted to
the open position, and the minimum headspace gage removed from the
chamber. The maximum headspace gage shall be inserted in the
chamber and the bolt returned to the battery position.Only finger
pressure shall be used to close the bolt.To be acceptable the bolt
shall not fully close.
4.7.1.3 Test results. If the above results are in dispute, the
weapon shall be disassembled and the 1.6206 + .0030 barrel dimension
and the
.156 - .003 bolt dimension shall be measured to determine
compliance with the drawing requirements.
4.7.2 Firing pin protrusion test. - This test shall be
performed during inspection lot testing in accordance with Table
IV. Measurements shall be taken with contractor gages approved by
the government.
4.7.2.1 Recording of data. - The following data shall be
recorded:
a. Weapon Serial Number
b.
Inspection lot number
c. Measurement of firing pin protrusion,
4.7.3 Trigger pull test. - This test shall be performed during
individual weapon test- accordance with Table III using
Government approved inspection equipment.
4.7.3.1 Minimum load. The weapon shall be cocked and the
selector lever placed in the AUTO position. The minimum load shall
be gradually applied to the center of the trigger and exerted in a
line parallel to the axis of the barrel bore. To be acceptable, the
bolt carrier shall not release.
4.7.3.2 Maximum load. The weapon shall be cocked and the
maximum load shall be gradually applied to the center of the trigger
as before. To be acceptable, the bolt carrier shall release.
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