If you have the knowledge and skill, this should occasionally be done - especially if the revolver has been in dirty or wet conditions, or it's been a long time and oil / grease has congealed and started to attract dirt.
If you are not familiar with the S&W K frame action, or some of the issues with side plate removal get it to a gunsmith that has experience working on these.
I had a buddy in the 70’s who worked for DOW Corning when they tested moly. He gave me some to try. I put moly in everything I had worked on.
Eliminates all wear moly gets into the pores of the metal and wears against itself, no wear.
Doesn’t attract dirt
It’s not a trigger job in a can but it will smooth out any action.