I use to shoot PPC back in the 80's and 90's.
I used these..........
686 (no dash) with adjustable factory frt sight and modified trigger for PPC
Bill Davis built 581 w/Aristocrat rib, etc....
I also used a 686 w/ 2.5" bbl for off duty matches. The trigger was modified. It looked liked any other 686 2.5".
BTW....I refuse to send my PPC revolvers back to S&W for the M modification. I don't want anyone to mess around with my triggers.
Aloha, Mark