And according to Bob Sterne, you can get away with .50-.60cc to 1 fpe if you increase reg. pressure 10%.Stopping Spring Guide, stops hammer bounce.
A good rule of thumb is 1cc of plenum per 1 fpe of energy, or thereabouts. So probably 18 fpe is doable. I don't think you would need an ssg with Daystate having the slingshot hammer, which serves the same purpose.
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