SIG SAUER SIG556xi - Manual (Page 21)

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if cycling or ejection problems are encountered due to heavy fouling, the gas valve can be moved to Position 2 by rotating
clockwise as far as the stop. in this position, a larger gas volume is released against the operating rod. The need to use the
gas valve in Position 2 is an indication that the rifle requires cleaning.
caution
-
in the case of a hot or heavily fouled weapon, use a cartridge or auxiliary aid to prevent burns to your fingers.
notice
-
firing with the gas valve in Position 2 is an exception. as soon as normal function returns, the gas valve must
be returned to Position 1. continued operation with the gas valve in Position 2 will increase recoil and
place unnecessary stress on the rifle. The rifle should be cleaned as soon as conditions permit.
waRning
- always ensure the rifle is unloaded and clear of ammunition when
manipulating the gas valve.