SIG SAUER SIG556xi - Manual (Page 20)

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2.1.6 gas Valve Position
The gas volume required for the function of the Sig556xi rifle can be controlled by the gas valve. The gas valve has three
positions:
a. Position 1 (rib of gas valve in vertical position).
under normal conditions, the gas valve should remain in Position 1. This will give the best all-around performance and
function.
b. Position 2 (rib of gas valve in the slanted position).
c. Position 3 (Suppressed Setting)
POSiTiON 1 - RiB VeRTiCAl POSiTiON 2 - RiB SlANTeD POSiTiON 3 - SuPPReSSeD