User Guide

2.
To clean the gas system, first spray the
gas piston with a good powder solvent
and brush it thoroughly to remove any
deposits (an old toothbrush is ideal for
this). Spray into the gap between the in-
ner and outer portions of the piston.
3. Clean the gas regulation valve system (it
is located inside the barrel ring guide/gas
cylinder) by spraying it with a aerosol
Browning Oil or a good powder solvent,
and brushing any deposits free (See Fig-
ure 23). NEVER use a steel brush on any
of the gas components.
Pay special attention to the gas pressure
vents (two large holes on opposite sides
of the barrel ring guide/gas cylinder),
and the two gas ports (seen inside the
gas cylinder at the top, when viewed
from the breech end). Spray again to
wash away the loosened deposits and
wipe clean. A NONFLAMMABLE sol-
vent bath can be used to immerse the
parts, but it is not necessary.
CAUTION: NEVER DISASSEMBLE THE
GAS
CYLINDER.
The parts are under spring tension and
require special tools for removal. It is not
necessary to remove the gas pressure
regulation valve assembly (from its loca-
tion inside of the barrel ring guide/gas
cylinder) to perform cleaning. You
should note that all gas system parts on
the A-500G have been given extra pro-
tection against corrosion: the magazine
tube is chrome-plated, and all other gas
system parts, including the piston,
springs, barrel guide ring and gas regula-
tion valve, are made from stainless steel.
4. Complete the cleaning of the gas system
by applying a very light film of Brown-
ing Oil to all parts for protection and lu-
brication.
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