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MIL-C-45978A(AR)
0.330 inch nor more than 0.480 inch.
f i r i n g pl unqer fin 1 pos ition
The firing plunger final
3.3.2.3
position is an indication of its maximum possible rearward travel
(breech mechanism closed). This position shall be measured as
the recessed distance from the front face of the breech ring to
the front end of the firing plunger. This distance shall be not
less #an 0.540 inch nor more than 0.580 inch.
3.3.2.4
Firing
pin
protrustion.
firiwpinprotn=ion
measured from the front face of the breechblock shall be not less
than 0.130 inch nor more than 0.145 inch in the fired position.
I
I
3.3,2.5 Firing pin over
Firing pin over--travel is an
,
travel.
indication of the maximum amount of firing pin travel beyond the
sear as the breech mechanism is opened. Over-travel shall be not
.
less than 0.145 inch nor more than 0.278 inch.
3.3.3
eadsp ace
Headspace, the distance between the front face
of the closed and locked breechblock and the rear face of the
tube, shall be not less than 0.190 inch nor more than 0.200 inch.
3.4
abilitv. Availability. Maintainabil ity and Durability
q
The RAM-D requirements of the M204 Howitzer system are
(RAM-D)
stated in MIL-H-63192(AR). Since the availability.requirements
are specified for the M204 Howitzer system only, this attribute
cannot be apportioned to the cannon. The requirements for
Reliability, Maintainability, and Durability are collected and
included in Appendix B. When specified, these requirements are
mandatory for compliance.
3.5
erforman ce.
3.5.1
gh Pre ssure res istance. The cannon and spare tubes
shall be capable of withstanding a chamber proof pressure of
55,000 ~ 2,000 psi within its operating temperature range (see
30.3 of Appendix A) when tested as specified in 4.7.6.
3.5.2.
al soundness
All parts shall comply with soundness
requirements specified on the applicable drawings.
3.5.3
ore enlargement. The bore diameters, measured across the
rifled lands after proof firing no more than eight rounds shall
not exceed the before firing diameters by more than the amounts
shown in TABLE I.
5
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