SIG SAUER SIG516 Rifle - Manual (Page 28)

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2.1.6.c. Position #3
(Suppressed) is for firing with a sound suppressor and is a partial cutoff of the gas system still allowing for cycling of the
weapon. you must depress the valve plunger prior to rotating the gas valve to this position.
FIG 11 Gas valve on suPPressed mode (actIon wIll cycle)
2.1.6.d. Position #4 (oPtional)
(off) is a complete cutoff of the gas system allowing the rifle to function as a single shot weapon.
FIG 12 Gas valve on P4 PosItIon, suPPressed mode (the actIon wIll not cycle)