SIG SAUER SIG516 Rifle - Manual (Page 58)

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7.3. gas Valve and Pushrod Removal
1. depress the gas valve plunger on the gas block and begin rotating the gas valve counterclockwise.
2. continue to unscrew the gas valve from the gas block until the threads are clear of the gas block.
3. Pull the gas valve free of the gas block.
Tilt the barrel downward and allow the pushrod assembly to slide out of the gas block.
FIG 30 PIcture oF the Gas valve BeInG removed