The trigger is standard SW J frame. Really heavy. same as all their other guns. The Pro Series does nothing for trigger action like the PC guns have.
As I mentioned above I changed the rebound to 13lb and polished the rebound slide and other wear areas. Makes a big difference. On a carry gun I leave the mainspring alone. Changing it only reduces it by 1/2lb anyway.
.
Hi foks. First time posting for a long time. I have a couple 642s, a 640, a 60-14 Ladysmith (in 357), an old 60 somewhere around here. An assorted bunch of other S&W pistols, a 686, a Combat Masterpiece before they started numbering 'em, a 625 JM and a 27-2. I use the snubbies, mostly the 640, for defensive carry in warmer weather. Other times a Glock 19 or Colt Combat Commander, but back to topic.
My thoughts on the trigger pull and sights, for that matter, on the 640: Any of the snubbies, all I need is minute of torso for accuracy. Think - seven yards, low light, high adrenaline, faster than the dogs can bark. Yes, I can hit clays or pop cans @ 15 yards, maybe farther if I take my time but the level of accuracy I need in an OMG moment is um, maybe 8" circle. When the adrenaline was jacking I didn't notice the trigger pull.
Smooth trigger, yes, and smooth draw and focus. That'll keep me alive. Just my thoughts.