The first series of x-mark, DID NOT have an adjustment screw in the trigger shoe itself. They used the same 3 screw adjustment like the old style 700 triggers.
These 1st series x-marks had the sear engagement screw glued so as it would never move again, only the trigger pull weight screw could be adjusted and most of these first series were easily set to a safe 2.5-3 lb pull.
The last model still has the same 3 screw adjustment as the first x-mark but with the addition of the trigger show screw, this screw is not a very effective adjustment screw, the trigger pull weight/return screw still needs to be adjusted in combination with the shoe screw. With the ones I worked with this style is the most inconsistent in the achievable finished safe weight of pull.