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A 5/8/2019 article on Outdoorhub.com does a better explanation of system than the manual does.

Yes. I wish Springfield Armory was a little more informative on the topic. I have read what the manual says. I will stick with the factory-installed screw until I see a reason to do otherwise.

The rifle came with four gas block screws, which invites the question, which to use? At present, the only plan for the rifle will be 150 or 165 grain bullets running 2600 or 2700 fps. No subsonic or suppressor. Not wanting to over-gas the rifle, what is the factory-installed screw set to handle...