Quote:
Originally Posted by Mike Koneski
I believe it is so the action stays tight and doesn’t mess up the geometry. Those are technical terms.
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Basically correct; it prevents the shooter from "fine tuning" (e.g., re-QUALIFYING) the top tang screw head so it stays true in butt-to-muzzle alignment. Loosening or over tightening the top tang screw can produce over- or under- torque on the top & bottom tangs; the trigger plate being immediately affected by that can stress the movement and timing of the ST platform and components and produce all types of 'unpleasant" results: misfires, nonfires, and my personal favorite, doubling.