Below is what Scott Mulkerin did to my 625. I replaced the Miculek grips recently.

DAO conversion with trigger job and overtravel stop
Shorten barrel to 4" recrown and install Weigand interchangeable front sight base.
Competition chamfer on cylinder...holes numbered
Polish...trigger,hammer,screws,thumb latch and ejector rod
Millet rear sight ( your choice of white outline or plain black )
SDM Gold bead front sight and SDM Super Sight ( Red or Green )
Miculek Competition Grips