Manual

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... Remove gas regulator from the forward
.. end of the gas cylinder: Turn in a counter-
clockwise direction. (See Figure 10) Use a
5/8" wrench for this operation. (Note: The
gas regulator will be very securely
tightened in the gas cylinder, and care
must be taken to firmly engage wrench
used for removal.)
~ Remove the gas piston: The inertia block
Iii8 should be pulled back toward the receiver
until rear face of the gas piston can be
pushed forward out of the gas cylinder
with a small drive punch. (See Figure 11)
(Note: An e.:'(tremely dirty gas cylinder and
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gas piston may require forcefully moving
the gas piston forward with a hammer
and drive punch, and extreme care must
be used to avoid scoring parts. If the gas
piston will not move with moderate force,
place a couple of drops of nitro-solvent
around the gas piston, wait about IS
minutes, and then try to push the piston
out with the drive punch. If the piston still
will not move, put more nitrosolvent on
the piston and allow it to set overnight
before attempting to remove the piston.
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Remov~ the in.ertia ~Iock. ~ction springs,
and action spnng guIde: Tightly grip by
hand the rear portion of the action and
action spring guide and pull forward
toward gas cylinder until the action spring
guide is clear of its recess in the receiver.
The rear end of the action spring guide
can then be moved to one side of the
receiver and then rearward to remove the
action spring, action spring guide, and
inertia block. (See Figure 12)
The gas cylinder can now be examined for
accumulations of residue. Residues in the
gas cylinder and on the gas piston should
be thoroughly removed with a good
quality powder solvent or bore cleaner. If
residues are heavy, they can be removed
by scrubbing the gas cylinder with a 20
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37
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RGURE 12
gauge shotgun bronze wire bore brush and
a good solvent.
The gas piston, gas cylinder, and other
parts covered by the forearm should be
wiped with a very lightly oiled cloth after
cleaning. The gas cylinder interior and the
gas piston SHOULD NOT BE OILED
beyond this.
Reassembly
Reassembly is just the reverse of steps for
disassembly. The action spring, action spring
guide, and inertia block are replaced first. The
gas piston is next inserted into the iront of the
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