Does it exist, particularly with a 3" or 4" barrel?

The only K Frame Airweight was the M12 .38 Spl. It was made in 2",4" and for a short time 5" and 6".
The J Frames had a 3" BBL available, but that's it for the K Frame. It has fixed sights.

By the way, I carried my 2" Sguare Butt Flatlatch 4 Screw M12 today. Haven't done that since Spring. It was 50 Degrees today and it hid nicely under a sweatshirt. (I love colder weather).
Jim

There is/was the model 315 Night Guard with a 2.5" barrel, now out of production.

__________________
Alan
SWCA LM 2023, SWHF 220

I think Supica refers to some one-off LW Model 15s. What a great little gun those would be!

P&R Fan has the right idea about cooler weather. We can all put away those little tiny guns and start packing some seriously scary heat again. I have a 3 inch Model 65 that does the trick.