SIG SAUER SIG 551-A1 Rifle - Manual (Page 23)

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2.1.8 Gas Valve Position
The gas volume required for the function of the SIG551-A1 rifle can be controlled by the gas valve. The gas valve has two
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).
PoS 1 - riB VertiCal PoS 2 - riB SlanteD
12SIG541_SIG551_A1MiniManual_Rev1.indd 23 2/17/12 2:48 PM