SIG SAUER SIG 551-A1 Rifle - Manual (Page 24)

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When 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.
CAUTION:
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.
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