Never owned a 23 and can't recall for sure, but I think the trigger on those guns is inertia-operated. The BSS has a mechanical trigger, and for a ST on a gun that's not very expensive, it's a pretty good one. A lot of people think the 23 trigger leaves a good bit to be desired.
Larry, the 23 trigger is mechanical too, not inertia.
You've often commented that 23 triggers have a lot of creep. I don't doubt you've found some that do, but mine and my brother's don't have unusual slack, and the triggers on our guns have been trouble-free for 25 years.
I think the 23 triggers are an adaptation of the Win. 101 trigger design. I know guys who've shot the original 101s gunning for springer field trials for 30+ years with no trigger issues. But maybe they'll have trouble this spring.
Jay
