When did Browning change front sight from silver solder to screws?
I don't know but I just checked mine, a 2011, and it is screwed on.
Mine is a 1993 Model per the serial number and it is screwed on as well.
I have a steel frame 1992 model, it has a screwed on sight base. My 1989 model has a silver soldered front sight base. The rear sights are identical.