Take the stock off, since you cannot see the screw with the stock on.When you say small set screw at the end of the cylinder, do you mean at the stock end? I see 2 screws at the stock end, the bottom one of which someone has told me is the hammer spring adjustment, which is silver. There is a black screw head above that but I do't think that is the one you are talking about
The degas screw is at the rear end of the air tube.
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