Is there any possibility someone has put a lightened mainspring in that is interfering with the grip screw? A particular brand of mainsprings has a raised rib , and it can sometimes come in contact with the grip screw. This usually only happens with aftermarket grips. So, pull the grips and see. Or, it may be the double action sear has never been fit.
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H Richard
SWCA1967 SWHF244
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