SIG SAUER SIG556xi - Manual (Page 57)

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3. install the operating rod assembly:
a. insert the operating rod assembly into the gas tube. ensure the end with the charging handle notch enters first, notch
facing down.
b. Push the operating rod in until fully seated. The operating rod should move freely through the gas tube.
STeP 4
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4. install the gas valve:
a. install the gas valve positioning the flange so the valve contacts the gas tube flange.
b. rotate the valve to the right until it stops against the detent.
c. depress the detent and continue to rotate the gas valve until the flange of the gas valve is now in the slot of the gas
block.
d. release the detent and rotate the gas valve to the “normal” position.
e. check rotation from “normal” to “adverse”. The valve should move freely.
STeP 3