That actually clears it somewhat...The only factory trigger stops I've ever seen were on target (adjustable sighted) guns, but to all target guns have them...I have never seen a trigger stop on a service (fixed sight) gun...Ok, you made me go and look at a couple of K frames.
1970 M19-3, 2 1/2” has one
1973 M66, 4” has one
1971 M17-3, 6” has one
1976 M10-5, 4” does not
I don’t know if this helps or just muddies the water.
