The trigger is mechanical. SST problems are, far and away, the most often reported issues with the Repros. That being said, it's usually only a matter of a good cleaning.
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You pick up a 90 years old Ithica or Fox with SST that's been hunted heavily in weeds and weather, never apart and almost all work properly. Then you get a Parker repro with single trigger thats sat cased since made and many have SST problem AND it needs a good cleaning to work? How did it get dirty ? That may be right but more likely their single triggers are mechanicly trouble prone. The market understands that.
