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|  MIL-C-45525B(WC)
forward against the rear of the spindle. The block assembly shall. be
capable of moving to the closed position only when the breechblock is
closed and locked. In this position the block assembly shall also be
capable of being moved manually into the load and extract positions.
3.4 Primer headspace. Primer headspace, the distance between the front
face of the block assembly and the rear face of the obturator spindle,
shall be not less then 0.054 inch nor more than 0.062 inch.
3.5 Firing pin Protrusion and retraction. The firing pin protrusion
measured from the front face of the block shall be not less than 0.114
inch and not more than 0.118 inch in the fired position. Firing pin
retraction behind the front face of the block shall be not less than
0.008 inch.
3.6 Performance.
3.6.1 High Pressure resistance. The cannons, repair tubes and muzzle
brakes shall be capable of withstanding 1134 percent of the 38,400
pounds per square inch upper pressure limit at 70F when tested as
specified in 4.5.4.2.
3.6.2 Material soundness. After completion of initial production or
acceptance testing, all parts shall be free from cracks and fractures
and shall comply with soundness requirements specified on the applicable
drawings.
3.6.3 Bore enlargement. Bore diameter across lands, after firing no
more than 15 rounds, shall not exceed the basic (minimum) diameter
specified on the applicable drawing by more than the amounts shown in
Table I.
Table I Bore enlargement
Distance forward of
commencement of rifling
0.10 inch
1 inch
1 cal.
2 Cal. to muzzle
Amount in inches
0.008
0.006 , 0.004
0,008
NOTE:
Interpolate to determine the allowable enlargement between
the distances listed.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the
contract or purchase order, the supplier is responsible for the performance
of all inspection requirements as specified herein. Except as otherwise
specified in the contract or order, the supplier may use his own or any
other facilities suitable for the performance of the inspection requirements
3
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