MIL-DTL-45500E
mechanism (M61A1 and M61A2 guns) shall be securely fastened to
the housing assembly as specified on the applicable drawing.
3.3.14 Rotor assembly. The rotor shall be proof tested and
magnetic particle inspection marked and serial marked in
accordance with the applicable drawings. The rotor gear, rotor
assembly, rear well springs and plate, and the front and center
bolt-tracks shall be fastened securely to the rotor body as
specified on the applicable drawing. There shall be no relative
movement of these parts. The rear bolt tracks shall assemble to
the rotor body in accordance with the applicable drawing, and
disassemble from the rotor body without the use of tools, except
for a probe to depress the lock pin. The track lock pins shall
move through their full range of travel without binding, and
shall be returned to, and held in, the extended position by
spring action to retain the rear bolt tracks in the locked
position on the rotor body.
3.4 Performance characteristics.
3.4.1 Firing pin protrusion and continuity. With the rotor
manually rotated until the firing pin cam is fully depressed and
the firing pin protrudes through the bolt face, firing pin
protrusion of each bolt assembly shall be .033 inches minimum.
With the locking block in the unlocked position and firing cam
pin fully depressed against block, the firing pin shall not
protrude beyond the face of the bolt. With the locking block in
the locked position (down 15° 30') and the cam pin depressed
until the firing pin extends .028 to .030 inches, there shall be
electrical continuity between the cam pin and the firing pin when
1.5 maximum voltage is applied. Testing shall be as specified in
4.5.3.2.
3.4.2 Head space. The head space in the assembled gun
shall be not less than 3.467 inches nor more than 3.488 inches
when measured to the 0.942 inch diameter datum on the first
shoulder of the chamber. Testing shall be as specified in
4.5.3.2.
3.4.3 High pressure resistance. Guns shall be capable of
withstanding the firing of one round of Government standard 20mm,
M54A1 high pressure test cartridge in each barrel. Parts shall
be free of cracks, seams and other injurious defects after proof
firing. Testing shall be as specified in 4.5.3.3
3.4.4 Functioning. Guns shall operate without
malfunctions, except that one misfire shall be allowed in each
75/100 rounds fired and no parts becoming unserviceable. Guns
shall meet the functioning requirements specified herein, and as
specified in the applicable specification sheet. Unless other-
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