Thank you for the kind words.
While I've not yet fired the pistol shown, the other four Swiss-made 550-series weapons I've owned are in a class by themselves, IMO. Amazingly accurate, reliable, and quite overbuilt. My results with the the two U.S.-made 556 versions I've owned has been less successful.
I've never taken apart a Swiss watch, nor would I even try, but I can change out parts in the Swiss 550-series fire control group without too much trouble. So, my guess is the firearms are much more straightforward.
On the subject of Swiss K31's, they too are in a class by themselves. That's why they win so much in the vintage matches at Camp Perry.