SIG SAUER SIG516 Rifle - Manual (Page 27)

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2.1.6.a. Position #1
(normal) is for normal operation.
FIG 9 Gas valve on P1
2.1.6.b. Position #2
(adverse) is for adverse conditions such as fouling or short stroking.
FIG 10 Gas valve on P2 adverse
cauTion: The rifle should noT be operated in Position #2 (adverse) for an extended period of time. as soon as normal
function returns, the gas valve should be rotated to Position #1 (normal). continued operation with the gas valve in
Position #2 (adverse) will increase recoil and place unnecessary stress on the rifle. Having to operate the rifle in Position
#2 (adverse) is an indicator that the rifle needs maintenance.