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Driving spring and driving spring guide assembly. |
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|  MIL-M-45974(WC)
3.2.11.1 Solenoid. The solenoid shall be as specified in SAPD-263.
Unless otherwise specified, the solenoid shall be assembled to the
solenoid housing in the position depicted on the applicable drawing. The
solenoid shall be securely retained to the solenoid housing by the rim
clenching clamp which shall be held in position by the clamp bolt.
3.2.11.2 Sear. The sear shall be capable of full engagement with
the sear notch on the operating rod and of holding the operating rod in
a cocked position. When the solenoid (see 3.2.11.1), is energized, the
sear shall disengage from the sear notch on the operating rod allowing
the operating rod to move forward under spring action. When the solenoid
is deenergized, the sear shall return to the engaging position by spring
action of the sear plunger.
3.2.11.3 Trigger. The trigger shall operate with a smooth, con-
tinuous movement when actuated. The trigger push necessary to operate
the firing mechanism shall be not less than 2.5 pounds and not more than
11.5 pounds. The trigger shall return to the normal position under spring
action of the sear plunger, after partial or complete trigger push.
3.2.11.4 Safety. The safety shall move manually between the safe
and fire position, and shall remain in the set position under spring
action until reset manually. The trigger mechanism shall operate smoothly,
without binding, through its full range of travel when the red surface is
readily visible. When the red surface is not visible, the safety shall
block all trigger action.
3.2.12 Driving spring and driving spring guide assembly. Driving
spring ends shall be securely brazed. Guide assembly stop shall be
securely brazed to the rod.
3.3 Performance characteristics.
3.3.1 Firing pin indent. The firing pin indent shall be not less
than 0.030 inch nor more than 0.035 inch. The firing pin indent shall
not be off center more than one-half the diameter of the firing pin point.
Testing shall be as specified in 4.5.3.2.
3.3.2 Headspace. The headspace shall be not less than 1.6315 inches
nor more than 1.6365 inches when measured to the .400 diameter datum on
the first shoulder of the chamber. Testing shall be as specified in
4.5.3.3.
3.3.3 High-pressure resistance. The machine gun shall be capable
of withstanding the firing of one Government Standard 7.62mm, M60 high-
-pressure test cartridge. Parts shall be free of cracks, seams and other
injurious defects after proof firing. Testing shall be as specified in
4.5.3.4.
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