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I don't think there is a really secure way to rotate the gas valve and not be worried about it blowing off after a shot or two. There isn't a position for "off".

Most subsonic loads won't cycle the action, that'd be the way I'd go if it was an issue.
Yes, there is a position for "off"... check the manual. I use it regularly now to check the condition of the first few rounds of a new load, since my rifle will normally eject forward of the line.

The valve doesn't have a super-strong seal (little bit of play in its spot in the gas block) and even in the off position, I believe a tiny bit of gas gets around the plug and to the piston... The carrier will retract a millimeter or two with a hot load.
 

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Terra brings up a very good point... Like I said, *check the manual* before proceeding... I think it is the position between 4 and S that is "off", but don't remember right off hand. One large gap in the numbered settings is "off", the other is for removing the gas plug, and yes, I imagine you could launch the plug well down range if you fired it in the loose/removal position. If at the range and you don't have the manual, you can check by pulling the gas plug forward after making your adjustment. If it comes out, well, that is not the setting you want. If you pull hard forward, and it doesn't move, that is the "off" setting. As with any normal gas setting, I'd make sure the detent is all the way out before firing; otherwise you are between settings.
 
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