I don't know too much ,but the one KT 38 frame gun that was made with a 'Bull'barrel was the
14-2 Hanen special for Dayton police supply. If you didn't read the caliber address on the side of the barrel
it might be mistaken for a model 19 with a heavy barrel.
Although ,now ,thinking about it , a model 19 with a 3" model 13 barrel installed, with a grooved ramp on top like the 14-2 would be interesting ....
The 14-2 heavy barrel
, shot this the other day.
Regards ,,,Allen