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|  MIL-M-45974(WC)
3.2.1.1 Gas cylinder. The gas cylinder shall be fastened securely
on the tube assembly by the gas cylinder rivets without relative movement.
With the barrel assembly disassembled from the receiver assembly, the
gas piston shall move of its own weight through its full range of travel
in the gas cylinder.
3.2.1.2 Gas cylinder extension, obturator and socket cap screw.
The gas cylinder extension and nut shall be assembled securely to the
gas cylinder without relative movement and shall be retained by the lock
wire. The gas cylinder socket cap screw (MS 24678-19), extension and
obturator shaH be lock wired as specified on the applicable drawing.
3.2.2 Barrel lock lever. The barrel lock lever shall,move manually
between the open and closed positions and shall be retained in either
position by spring action until manually changed, and shall retain the
barrel assembly in the receiver assembly when set in the closed position.
3.2.3 Bolt assembly. With the cover assembly opened and the bolt
assembly disengaged from the operating rod yoke, the bolt assembly shall
move of its own weight through its full range of travel in the slideways
of the receiver. Firing pin protrusion shall be as specified on the
applicable drawing. The bolt assembly shall be proof and magnetic par-
ticle inspection marked in accordance with the applicable drawing.
3.2.3.1 Cam actuator assembly. The cam actuator assembly shall-be
retained on the bolt by the bolt plug and shall rotate without binding on
the bolt. The bolt guide roller and the cam actuator roller shall be
retained on the cam actuator by the roller rivet and shall rotate without
binding on the cam actuator.
3.2.3.2 Ejector. The ejector shall be retained in the bolt by the
staked ejector retainer and shall be held in the forward position by
spring action. The ejector shall move through its full range of travel
under spring action without binding and shall eject cartridge cases com-
pletely out of the machine gun when the machine gun is fired or manually
operated.
3.3.3.3 Extractor. The extractor shall be retained in the bolt by
the extractor plunger and spring. The extractor shall move through its
full range of travel under' spring action without binding and shall extract
cartridge cases from the barrel when the machine gun is fired or manually
operated.
3.2.3.4 Firing pin. The firing pin shall move through its full range
of travel in the bolt under spring action without binding.
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