dogsoldier,
All target sighted K-frames, 14, 15, 16, 17, 18, 19, 48, 53, their stainless steel equivelents, etc. had the trigger stop. Supposedly guns ordered by a LE agency could be supplied without the stop installed, but the would come with the cut for it and the screw installed. Most former LE guns found without the stop had it removed by the dept. armorer or the user.